Crane coal branch rings (Harazuru coal MMR) is a crane safety Hebi coal mine, located in the middle Hebi mining, mining a seam two, Ida range with two shallow coal seam outcrop 1 is bounded to -600m deep level two seam 1 The bottom line is bounded by the F20 fault and the third mine in the north, and the F40 fault and the six mines in the south. The stratum tends to be nearly north-south, tending to the northeast, and generally has an approximate monoclinic shape, and the ground is covered by the Neogene and the Quaternary.
Stratum
The Wuhuan Branch is located in the Taihang Mountain Community in the Shanxi Division of the North China Stratigraphic Zone and the Yubei Community in the North China Plain. The strata in the area are from the old to the new, the Denggu group in the Archaic, the Lushan group in the Lower Yuan Dynasty, the Xiong'er group, the Fuyang group and the former Sinian in the Upper Proterozoic, the Cambrian and Ordovician in the Lower Paleozoic, and the Antiquity. The Carboniferous, Permian, Triassic in the Mesozoic and the third and fourth in the Cenozoic. The Archaic and Proterozoic are mostly exposed in the Qixian County of the south of the coalfield. The Cambrian and Ordovician are mainly exposed in the western and southwestern mountainous areas of the coalfield. The Carboniferous-Permian coal-bearing strata are present in the coalfields. The Triassic is only concealed in the deep north part of the coalfield, and the Cenozoic is widely covered above the above layers.
2. Coal seam
The coal-bearing strata of the Wuhuan branch is the Carboniferous-Permian system. The coal-bearing strata are the Carboniferous Upper Taiyuan Formation, the Permian Lower Shanxi Formation and the Lower Shihezi Formation. The total thickness of the coal-bearing strata is 517m, containing coal. 14 layers, the total thickness of coal seam is 13.4m, and the coal containing coefficient is 2.59%. The Lower Permian Shihezi Formation only contains coal lines and has poor coal content; the Lower Permian Shanxi Formation and the Upper Carboniferous Taiyuan Formation contain recoverable coal seams with good coal content and are the main coal-bearing strata in this area. The development of recoverable coal seam 1 layer (two 1 coal seam), the total thickness of recoverable coal seam is 7.41m, and the recoverable coefficient is 1.43%.
The second coal seam (commonly known as large coal) is the main recoverable coal seam in the area. It is located in the lower part of the Lower Permian Shanxi Formation and has a stable horizon. Shale roof which is black or sandy shale, roof - a gray fine grained sandstone, present a good indicator layer region; seam floor mudstone or sandy shale, tell your ~ gray fine grained feldspar quartz sandstone. The maximum thickness of the 2nd coal seam is 10.12m (exposure under the well), the minimum thickness is 2.23m (Luo Caikong), the average thickness is 7.41m, the coefficient of variation of coal thickness is 28.21%, and the recoverability index of coal seam is 100%, which belongs to stable coal seam (Id). .
3. Construction
The Wuhuan branch is located in the central part of the Taihang fault in the Taihang tectonic sub-region. The overall structural form is an axially northeastern 45°, northward-sloping, oblique structure. The two wings are basically symmetrical, and the northwest wing is inclined at 15°. 25°, the dip angle of the South East Wing is 10°～25°. The internal structure of the mine field is dominated by faults, which can be roughly divided into NE and NNE groups according to the direction. According to the statistics, there are 8 faults with a drop of >20m. The faults with local drop <20m are more developed, and more faults appear in groups. The faults belong to normal faults. The mine has partially developed a collapse column and no magmatic rock. The coal mine is structurally complex.
The main body of the Wuhuan Branch is constructed as a tilting and slanting structure, and the direction of the oblique axis is N30° to 55°E. The north and south wings are basically symmetrical, the dip angle of the northwest wing is 15°-25°, and the dip angle of the southeast wing is 10°-25°. The oblique shape is shallow, the middle part is confirmed by the roadway, and the deep part is controlled by drilling, and the control is reliable.
The characteristics of the mine field are mainly faults. According to incomplete statistics, there are 98 faults with a drop of 0.8m or more in the whole well field, and 8 large and medium faults with a drop of more than 20m, all of which are positive faults of NE or NNE, which are torsional and torsional faults. The faults in the Wuhuan branch have a large difference between the north and south wings, and the south wing faults are relatively developed, with many faults and long distances. For example, IIF01, IIF02, IIF03 and F41, F40 and F40-1 are all developed in the south wing, and there are dozens of normal faults with a drop of less than 10m, which affects the rational division and normal production of the working face. There are relatively few small faults in the north wing, mostly concentrated on the working face near the boundary fault (F20, F20-1), and the drop is generally less than 5m, and the extension length is also short.
The size of the small fault of this mine is generally 3 ~ 5m normal fault, the direction of the distribution is parallel or perpendicular to the direction of the side main fault, generally developed on both sides of the large fault, and the fault density is not balanced, the high density area is generally 100m distance There are 1 to 2 faults in the interior, and a low-density zone usually has a fault around 200m.
According to the characteristics of the above-mentioned small faults, the main distribution areas of the small fault density areas in the unmined area of ​​the mine are predicted to be along the F41 and F40-1 faults, along the direction of the upper plate and 1200m; along the lower plate of the F20 fault, the range is 1000m. (predicted lower limit mining depth -600m)
The small ring of the south wing is relatively developed in the Wuhuan branch-450m～-600m, and the north wing is relatively undeveloped. It will have a certain impact on coal seam mining in the future, and should pay sufficient attention to the design and production of coal mining areas.
4. Risk analysis of confined aquifer underfloor
According to the situation of mines, the Ordovician limestone confined aquifer (O2m) belonging to the bottom aquifer, the second layer of the carbonate rock karst fissure aquifer (C2tL2) of Taiyuan Group, and the eighth layer of Taiyuan Group Carbonate fractured aquifer (C2tL8)
1 Ordovician limestone confined aquifer (02m)
The aquifer is separated by a distance of 148.21~163.9m and the average spacing is 157.71m. From January to December 2014, the measured O2m water level elevation range is +118.102m~+124.452m (average +121.277m). The Wuhuan Branch has entered the coal mining area in the deep and downhill mining area, and the coal seam has an elevation of -450m to -600m. According to the requirements of the Coal Mine Water Control Regulations, the formula of the water inrush coefficient is as follows:
T--water inrush coefficient (MPa/m);
P--water pressure (MPa) of the water-repellent layer of the bottom plate, 7.3-8.8 MPa;
M--floor water barrier thickness (m), 157.71m.
The calculated water inrush coefficient T is 0.046 MPa/m to 0.056 MPa/m, which is less than 0.1 MPa/m.
Under the normal structural conditions, the O2m aquifer water inrush problem does not occur in the mining activities, but it is necessary to prevent water inrush from the karst collapse column through faults or water conduction. Our mines have fault-to-waterproof coal pillars for faults with a drop of more than 30m. At the same time, it is necessary to strengthen the exploration and control of small faults in the minefield.
2 Taiyuan Group, the second layer of carbonate rock karst fissure confined aquifer (C2tL2)
The aquifer is separated by a distance of 106.59～117.90m and the average spacing is 110.76m. From January to December 2014, the measured C2tL2 water level elevation range is from +97.797m to +100.427m (average +99.112m). The Wuhuan Branch has entered the Yanshen Mining Area for coal mining, and the coal seam has an elevation of -450m to -600m. According to the requirements of the Coal Mine Water Control Regulations, the formula of the water inrush coefficient is as follows:
T--water inrush coefficient (MPa/m);
P--water pressure (MPa) of the water-repellent layer of the bottom plate, 6.6-8.1 MPa;
M--floor water barrier thickness (m), 110.76m.
The calculated water inrush coefficient T is 0.06 MPa/m to 0.07 MPa/m and less than 0.1 MPa/m.
Under normal structural conditions, mining activities generally do not cause water inrush in the C2tL2 aquifer, but it is necessary to prevent water inrush from the karst collapse column through faults or water. Our mines have fault-to-waterproof coal pillars for faults with a drop of more than 30m. At the same time, it is necessary to strengthen the exploration and control of small faults in the minefield.
3 Taiyuan Group Eighth Carbonate Fracture Fissure Aquifer (C2tL8)
The distance between the two aquifers is 27.80m~39.71m, and the average spacing is 33.35m. According to the analysis of the previous C2tL8 drainage water project data, the water level of the C2tL8 aquifer is now elevated, and the south wing of the deep mining area is at -597m. The north wing is at -600m.
The C2tL8 water inrush problem does not occur during the mining process, and there is no water damage that affects safe production.
Second, the purpose and basis of preparation
The coal seam of the Wuhuan Branch is a Carboniferous-Secondary coal-bearing strata, and the mining project of the mine will be threatened by the Carboniferous limestone and Ordovician limestone confined water. It is calculated that the water head value of the interval between the mining head surface and the confined aquifer in the Wuhuan Branch is within the safe range and is a safe belt pressure mining. However, in order to strengthen prevention and prevent the pressure-bearing aquifer from filling the mine with water and causing disasters, according to the requirements of the “Regulations on Coal Mine Water Prevention and Controlâ€, safety technical measures for prevention of coal-bearing aquifer water-pressure mining are prepared.
3. Mine water-filled water source and confined aquifer
Surface water
The area is located in the east of Taihang, the central part of Hebi Coalfield. The sea level is +216.4m ~ +144.2m, and the relative height difference is 72.2m. It is a low hilly area. The terrain in the western mountainous areas is relatively high (maximum elevation +763.5m), the Cambrian (∈) and Ordovician (O) strata are widely exposed, and the terrain of the minefield and the east is gradually flattened, and is covered by the Neogene and Quaternary strata. .
There are two rivers flowing through the mine of Wuhuan Branch, namely: Tangquan River and Luocun River. The maximum flood flow of Tangquan River is 1280m3/s (August 1980), and the highest flood level is +145.96m, which is lower than the height of the wellhead. The elevation of the wellhead is +171.1m, the elevation of the wellhead is +170.8m, the elevation of the wellhead of Yuanquan wind well is +166.3m, the elevation of the wellhead of Dongyaotou is +166.77m, and the current flow is 422.64m3/h. Tested on August 7th).
The current flow of Luocun River is 1172.16m3/h (measured on August 7, 2014). The main source of river water is mine drainage, and the water level is lower than the wellhead elevation. The Luocun Reservoir is connected with Luocun River, and the storage capacity is extremely small. Used for farmland irrigation. Because the flow of the two rivers is small, and the surface soil layer has a thicker water layer in the thicker coal seam, the mine structure is not a threat to water damage.
Aquifer
According to the previous exploration data (lithology, structure, water-rich, occurrence characteristics, etc.) and the production practice since the mining of the 2nd coal seam, the aquifer in the mine area is divided into five, which are described as follows:
(1) Ordovician Zhongjia Majiagou Formation carbonate karst fissure confined aquifer (O2m)
Its total thickness is about 400m, which is located at 148.21~163.9m under the second coal, with an average of 157.71m. The western part of the mining area is widely exposed and the recharge conditions are good. The lithology of this layer is thick layered, thick layered limestone and dolomitic limestone, and karst fissures develop.
The Ordovician limestone is widely exposed in the western part of the minefield and is directly replenished by atmospheric precipitation. It forms abundant groundwater and flows from the west to the east. It is concentrated outside the drainage area in the form of karst springs. It is directly or indirectly replenished through faults in the area. The C2tL2, C2tL8 limestone aquifer and the aquifer of the 2nd coal roof and floor sandstone (S9, S10) constitute a serious threat to the mine. On May 16, 1981, an Ordovician limestone water inrush accident occurred in the Shilin mine in the southern part of the mine field. The maximum water inrush was 13507 m3/h.
(2) Taiyuan Group, the second layer of carbonate rock karst fissure confined aquifer (C2tL2)
The C2tL2 limestone is well developed in this area, with stable distribution, thickness of 4.19~10.74m, average thickness of 8.02m, karst fissure development, and karst fissure confined water.
The aquifer is separated by a distance of 106.59~117.90m, the average spacing is 110.76m, the average distance from the O2 limestone is 38.66m, and the average spacing from the C2tL8 limestone is 80.75m.
The C2tL2 limestone exposure area and water receiving area are very small, only scattered in the west of the mine field, the general water volume is not large, but due to the cutting of the south wing fault (F40, F41) can be connected with the O2m limestone hydraulic connection, is two 1 Indirect water-filled aquifer filled with coal.
(3) The eighth layer of carbonate rock fractured aquifer in Taiyuan Group (C2tL8)
The C2tL8 limestone is well developed in the area and has a stable distribution with a thickness of 3.92~5.23m and an average of 4.68m. The karst fissure is relatively developed and contains karst fissure confined water.
The aquifer is separated by a distance of 27.80-3.71m, with an average of 33.35m, and has a tendency to gradually shorten from northwest to southeast (close to 40m north of the oblique axis and from south to 35m from 2m).
The C2tL8 limestone is a direct water-filled aquifer for the mining of the No.1 coal. Due to the F40, F41, IIF01, IIF02 and IIF03 faults, it is hydro-connected with the C2tL2 and O2 limestone aquifers to obtain a larger amount of recharge. And the water-bearing characteristics that are not easy to drain, thus posing a major threat to the mining of the No. 1 coal. According to the analysis of the previous C2tL8 drainage water project data, the water level of the C2tL8 aquifer is now high, the south wing of the deep mining area is -597m, and the north wing of the deep mining area is -600m, which has no effect on the mountain mining area under the three-level extension.
(4) Two 1 coal roof plate (Shanxi group S9, S10 and S11) clastic rock pore fissure confined aquifer
The aquifer group consists of medium and coarse-grained sandstones (S9, S10, S11), which has good development and stable horizon. It belongs to the direct abutment aquifer of the No. 1 coal and contains pore-bearing confined water. The total thickness of sandstone is 2.85~60.11m, with an average of 30.41m. Among them, the two coals (S10, S11) have a thickness of 1.85 to 46.35 m, an average of 21.37 m, and a thickness of two coals (S9) of 1.00 to 13.76 m, with an average of 9.04 m. The fissures of the aquifer group are unevenly developed, and the water content is not large, and it is easy to be dried in general. However, the amount of recharge water in the O2m, C2tL2 and C2tL8 limestone aquifers is relatively large and lasts for a long time. Although the aquifer group has an adverse impact on mine production, it does not constitute a water hazard and gradually drains as the mining project is exposed.
(5) Neogene, Quaternary alluvial, alluvial pore fissure water-bearing group
The aquifer group consists of sand and conglomerate (layer), covering the coal-bearing strata, receiving atmospheric precipitation recharge, and containing pore-fractured water (top is diving). The aquifer group is about 300 meters thick from the water-repellent layer of the second coal roof. Due to the large thickness of the water-blocking layer, it has no direct impact on the mining of the No. 1 coal. It is the main component of the water volume of the main, auxiliary and two wind shafts. .
3. Water-repellent layer and mine waterproof coal pillar
(1) aquifuge
1 The water layer of the Benxi Formation consists of aluminous mudstone and sandy mudstone with an average thickness of 29.39m. The layer is thick and stable, and is a good aquifer that blocks the O2m limestone from the upper aquifer.
2 The central aquifer of the Taiyuan Formation, located between the C2tL2 and C2tL8 limestone aquifers, consisting of mudstone, sandy mudstone, thin sandstone, thin layer of limestone and thin coal seam, about 70m thick, for blocking C2tL2 and C2tL8 limestone The hydraulic connection between them plays an important role.
The bottom water layer of the 3 2 coal is composed of mudstone and sandy mudstone between C2tL8 limestone and S9 sandstone, with a thickness of about 25m. It will play a role in blocking the water from the C2tL8 limestone to the S9 sandstone and the second coal.
4 2 coal top aquifer, composed of mudstone, sandy mudstone and sandstone from the top of S10 to the third and fourth aquifers, with a thickness of more than 300m, to prevent the Neogene and Quaternary aquifers from filling the mine A good water barrier.
Page 2 / (2 pages in total) (2) Mine waterproof coal pillar
At present, the main mining face of the mine is concentrated in the three-level deep mining area. The F40-1 fault is located in the southern part of the mining area with a drop of 140-200 m. The F20 fault is located in the northern part of the mining area with a drop of 75-110 m. Both faults belong to the water-conducting fault, which is serious. Threatening the safe production of mines in the mining area, He Coal Branch [2006] No. 81 text on the F20, F40-1 mine faults, the waterproof coal pillars were approved, and the waterproof coal pillars were confirmed.
Due to the large gap between the IIF01, IIF02 and IIF03 faults, the Mazhuang mining area is naturally divided into three block sections. In order to ensure safe production, the crane coal section [2006] No. 30 on the F41, IIF01, IIF02, IIF03 waterproof coal pillars A reply was made.
4. Mine water filling factor
(1) Water-filled water source
1 atmospheric precipitation
Atmospheric precipitation has a certain impact on the mine water inflow, but the impact is not large, generally does not affect the normal production of the mine, and with the increase of mining depth, atmospheric precipitation will gradually weaken the water filling intensity of the mine.
2 surface water
The mine is located in the eastern part of the Taihang Mountains and the Hebi mining area. The elevation of the sea level is +212.9~+144.2m, and the relative height difference is 68.7m. It belongs to the low hilly area. The Tanghe River in the area flows from the north to the south by the west of the mine. The flow rate is 1033.2m3/h (June 28, 2000). The Luocun River flows from north to south in the east and forms a small reservoir. The flow rate was 1317.6m3/h (March 9, 2001). In 2014, the Wuhuan branch measured its flow rate to 1140.76 m3/h. The Luocun Reservoir has a small reservoir capacity and a Neogene clay with a basement of 50-80 m. The water-blocking performance is strong, which makes the surface water and the bedrock groundwater not hydraulically connected, and has no effect on the development of the deposit.
3 groundwater
According to the water inrush data in the mine, the 2 1 coal roof and floor sandstone (S9, S10, S11) fissure water and C2tL8 limestone karst fissure water are directly filled aquifers for mining 2 1 coal, and the aquifer groundwater can pass through structural fractures. The wells are discharged into the mine through channels such as underground water discharge holes and ground closed bad drill holes. The sandstone water of the top and bottom of the second coal is generally exposed in the unit goaf, and the structural fracture zone and cracks are exposed to the well through the mining face or the roadway engineering. The general water volume is small, and the recharge amount is small and easy to be drained.
C2tL8 limestone water mainly exposes structural fractures (mainly faults) through the roadway. When water inrush occurs, the initial water output is large and the water pressure is high, but the water volume and water pressure decay rapidly. Most of the C2tL8 limestone water inrush point is in the south wing area, and the water volume is large, while the water volume in the north wing is relatively small, showing the heterogeneity of C2tL8 water-rich, and when there is water inrush in the lower part of the mining depth, The upper outlet point shows the characteristics of being gradually drained. After long-term drainage of C2tL8 limestone water, the water level has dropped to -600m, and there is no threat to the mine.
4 old empty water
The original Shilin mine near the F41 fault in the second horizontal section of the south wing of the mine was flooded with water (13507m3/h) on May 16, 1981. It is estimated that the nearby old area will collect about 612,966m3 of water, and the IF01 and IIF02 faults will be damaged. Mining near the F41 large fault has a certain impact. In the mining process, some small-scale water accumulation has also formed in the mine. These water-storage areas have dynamic changes with the mining conditions.
Old air is an important factor affecting the safety of the mine. For the old water accumulation area formed by the original Shilin mine with stable supply water source, waterproof coal pillars shall be reserved according to regulations, and it is strictly forbidden to enter the waterproof coal pillar for mining activities. For the accumulated water formed during the mining process of the mine, it is necessary to do a good job in the exploration and release of water in accordance with the basic principles of “predictive forecasting, suspected exploration, first exploration and subsequent exploration, and first treatment and subsequent miningâ€.
(2) water filling channel
1 Fracture channel: The fracture that can fill the mine includes structural fractures, artificial fractures and weathering fractures.
Structural fissures: Here mainly refers to the fracture fissures generated during the tectonic movement and the extensional fissures of the pleats of the pleats. The fractures at the transition points of the faults, the tip end of the fault and the axis of the fold-up end are relatively developed, often forming a charge to the mine. The water-intrusion channel can introduce different layers of groundwater into the mine, posing a greater threat to the safe production of the mine.
Artificial fissure: mainly refers to the water-conducting fissure zone formed on the roof of the goaf, which can introduce the groundwater from the rock sand aquifer of the second coal seam into the mine; the second is the aquifer in the coal seam floor during the mining process. The resulting disturbance destroys the crack. Artificial fissures are generally infiltrating channels with low water filling intensity and generally do not affect safe production.
Weathered fissure: This type of fissure has a certain water-filling effect on the shallow coal seam, and generally introduces the overlying Cretaceous pore water into the mine.
2 Closed bad drilling: The area has undergone several production geological explorations, and there are as many as 82 drilling holes in the area. There are two closed poor boreholes, which are crushing channels, which often pose a great threat to safety production. In the future, during the mining process, the closed or unclosed borehole should be guarded as a water guiding channel to make water inrush into the mine. When the mining activity is close to the poorly closed borehole, the mining activity should be carried out after grouting and strengthening.
3 Collapse column: At present, there are 6 collapse columns in the mine area. The 3rd collapse column is located on the southeast side of the syncline axis, 50m wide and 25m long, and the elevation is -120m. The 4th collapse column is located on the northwest side of the syncline axis and is 50m long. The width is 20m, the elevation is -240～-260m; the 5th collapse column is located on the northwest side of the oblique axis, the near-circular radius is about 27m, and the elevation is -340m; the 6th collapse column is located at the oblique axis, 80m寛60m, elevation-380m In addition, the No.1 and No.2 collapse columns are located in the shallow part of the mine. The collapse column is densely packed by the upper formation and has no water permeability. No trapping column was found in the 450-~600m exploration borehole, but the possibility of its existence cannot be ruled out. It should be explored during mining.
Fourth, the threat of water damage
Evaluation of fault water conductivity
In the mine field, NE~NNE is mainly composed of compressive and torsional normal faults, and there are 8 with a drop of more than 20m. From the statistics of 29 boreholes replenished from 84 to 85 years, the hole was seen 36 times in the fault, the core was broken, and the consumption of flushing liquid was 1.35m3/h except 584-12 hole. The rest consumption of the fault point was less than 0.3. M3/h, indicating that under normal conditions, the water conductivity of small faults in the area is weak, but during the mining process, due to the effect of mine pressure and head pressure, the original non-conducting fault can be transformed into a water-conducting fault ( Such as the second level of the south wing in the middle of the mountain down the 12th point of the water point).
F40 and F41 in the east of the mine field make O2m close to or butt with C2tL2, C2tL8, C2tL2 and C2tL8, and make it hydraulically connected to form the recharge boundary of the southeast of the mine. However, during the process of circulation to the mine, the turbulent conditions are deteriorated due to the multiple cutting of the fault, and the water volume at the water inrush point of the C2tL8 limestone aquifer is stable and not large. The F20 and F20-1 faults in the northern part of the mining area are poorly guided, and the leakage loss is small (such as 584-16, 584-17 holes, etc.), which cut off the hydraulic connection between C2tL8 and the outside world, forming a relatively water-tight boundary in the northern part of the minefield.
In addition, due to structural control, the faults in the southern part of the minefield are developed. The distance between the C1tL8 limestone aquifer is relatively small, the karst fissures are developed, and the C2tL8 is connected to the C2tL2 limestone through the fault. The water filling condition is more complicated than that of the north wing. Come to a bigger threat.
2. Small coal mines around
There is no production of small coal kiln in and around the mine field of Wuhuan Branch. There is an abandoned small coal kiln in the minefield as Shilin Coal Mine, and there is an abandoned small coal kiln around the mountain city coal mine.
1 Yuanshancheng Coal Mine was scrapped backfilled in March 2007. Before the backfilling, the mine was checked for water; on December 20, 2007, the wellbore was backfilled and leveled again; the mined area of ​​the mine was connected to the Wuhuan Branch. Check the waterless, the closure of the abandoned small coal kiln threatened the five-ring branch of the water.
2 According to the boundary delineated by the latest mining license obtained by Hebi Coal Ring Road in 2006, the original Shilin Coal Mine is now located in the minefield of the Wuhuan Branch. The mine was flooded on May 16, 1981. Recovery, the amount of water reached 612,966 m3. There is a water-proof coal pillar between the 23 mining area of ​​the mine and the original Shilin ore water-storage area (Reply document "Hemei Coal Branch [2006] No. 30"). Our mine strictly implements the “Regulations on Coal Mine Water Prevention and Controlâ€, and now there is no mining activity in the waterproof coal pillar.
3. Overview of mine water over the years
Since the construction of the well, Wuhuan Branch has had 18 water inrushes, and 10 times of large water inrush (water inrush >60m3/h), including O2m limestone (nearly Shilin mine) and C2tL8 limestone 8 times. , the first 1 sandstone roof sandstone. The maximum water inrush of O2m limestone is 13507m3/h (Shilin Coal Mine), the maximum water inrush of C2tL2 limestone is 79.8 m3/h (2105 coal pillars), and the maximum water inrush of C2tL8 limestone is 1210m3/h (two horizontal middle and lower mountains). The maximum water inrush from the top 1 sandstone of the 2nd coal seam is 80m3/h.
5. Drainage capacity
The mine must establish supporting anti-drainage facilities. The pump must have three sets of work, standby and overhaul. The working pump should be able to discharge the normal water inflow of the mine for 24 hours within 20 hours. The capacity of the standby pump is not less than 70% of the capacity of the working pump. The ability to overhaul the pump is not less than 25% of the capacity of the working pump. The water pipe must have two sets of working and standby water pipes, and the working water pipe capacity should be able to match the normal water inflow of the working water pump for 24 hours in the mine within 20 hours. The power distribution equipment should be compatible with the work, standby and maintenance pumps, and can start working and standby pumps at the same time. The volume of the main and auxiliary water tanks meets the requirements and must be cleaned up in time, but it must be ensured that one water tank can be used normally when it is cleaned.
Sixth, safety technical measures
1. The mine surveying department must leave fault waterproof coal pillars for faults with a drop of more than 20m. The design of waterproof coal pillars must be in accordance with the requirements of the Mine Water Control Regulations and submitted to the company for approval.
2. The mining and geodetic survey department must strictly adhere to the principle of “predicting and forecasting, suspecting and exploring, first exploring and then exploring, first treating and then miningâ€, and exploring the geological and hydrogeological conditions in front to prevent water inrush accidents.
3. The mining and mining survey department shall regularly collect the ground drilling water level according to the regulations, and master the dynamics of the water level of the ash and the second ash.
4. In areas where mines are threatened by water damage, drilling, geophysical and geochemical exploration methods should be used to check hydrogeological conditions before roadway excavation. The mining and geodetic survey department shall submit a hydrogeological analysis report and propose water hazard prevention measures. Only after the mine chief engineer organizes production, safety supervision and geodetic survey and other relevant units to review and approve, can the construction be carried out. During the construction process, the mining and geodetic survey department shall use various means to ascertain the direction, drop and fault water conduction of the fault near the construction site.
5. Before mining coal mining face, geophysical exploration, drilling, roadway exploration and geochemical exploration should be used to find out the faults, subsidence columns and water-bearing layer (body) water-rich conditions in the working face. The geodetic survey agency shall submit a report on special hydrogeological conditions, which may only be recovered after the mine chief engineer organizes production, safety supervision and geodetic survey and other relevant units to review and approve. If it is found that faults, fissures and subsided columns are filled with water, safety measures such as grouting reinforcement or retaining water-proof coal (rock) columns should be taken. Otherwise, you must not pick it up.
6. When designing the roadway, the design department strictly follows the geological drawing design provided by the local survey department. It is strictly forbidden to go beyond the fault waterproof coal pillar line. The mine shall not carry out mining activities in the waterproof coal pillar for any reason.
7. Prepare emergency rescue plans for major water hazard accidents in mine prevention, conduct regular pre-plan exercises, proficiency plan, and coordinate the organizational capabilities of various departments. In the event of a water inrush accident, the dispatching room shall be notified in time, and the dispatching room shall promptly notify each level pumping station to enter an emergency state and drain the rescue, and inform the underground personnel to quickly withdraw according to the disaster avoidance route. The geological personnel of the geology department should quickly go to the water discharge site to check the water condition, the water source and the amount of water, and report to the dispatch in time to facilitate the dispatching of the command and rescue and relief.
8. The mine must establish supporting anti-drainage facilities. The pump must have three sets of work, standby and overhaul. The working pump should be able to discharge the normal water inflow of the mine for 24 hours within 20 hours. The capacity of the standby pump is not less than 70 of the capacity of the working pump. %, the maintenance pump capacity is not less than 25% of the working pump capacity. The water pipe must have two sets of working and standby water pipes, and the working water pipe capacity should be able to match the normal water inflow of the working water pump for 24 hours in the mine within 20 hours. The power distribution equipment should be compatible with the work, standby and maintenance pumps, and can start working and standby pumps at the same time. The effective volume of the main and auxiliary water tanks meets the requirements and must be cleaned up in time, but it must be ensured that one water tank can be used normally when it is cleaned.
9. After the water discharge from the head surface of the three-level deep mining area, the dispatching room shall promptly notify the pumping stations of each level to enter the emergency state and drain and rescue.
10. Prepare a road map for avoiding floods. Each construction work surface should be hoisted with a road map for avoiding floods, so that everyone at the construction site is familiar with the disaster avoidance route.
11. If there is a sudden water warning or a water inrush accident, it is necessary to avoid the disaster in the principle of “water flowing to a low place and people going to a high placeâ€, and find the nearest telephone call dispatching room along the way. After that, it is necessary to immediately launch a major flood emergency rescue plan and evacuate all personnel affected by water damage.
(1) In the near future, the disaster avoidance routes of the front-line workers are as follows, and the people on the road are evacuated.
1 2303 work surface along the trough → 2303 auxiliary transport lane → 2303 middle lane → three horizontal south wing track Shangshan one yard → 23 mining area transport flat lane → 23 mining area transport down the mountain (upward) → 23 mining area yard → two horizontal Nanda Lane → an overhead man → a horizontal walkway → auxiliary bottom → ground
22303 working face down the trough → 2303 middle lane → three horizontal south wing track Shangshan one yard → 23 mining area transport flat lane → 23 mining area transport down the mountain (upward) → 23 mining area yard → two horizontal south alley → an overhead man Car → one horizontal walkway → auxiliary bottom hole → ground
33303 working plane and slotting→3301一å·â†’3301ä¸å··â†’three horizontal deepening track one yard→three horizontal deepening track downhill (upward)→three horizontal alley→two overhead manned vehicles→two horizontal north Lane → an overhead man → a horizontal walkway → auxiliary bottom → ground
43303 working face down the trough→3303一å·â†’-520å—大巷→three horizontal deepening track two yards→three horizontal deepening track downhill (upward)→three horizontal alley→two overhead manned vehicles→two horizontal north alley→ An overhead manned vehicle → a horizontal sidewalk → a secondary well bottom → ground
533 mining area transportation downhill (lower section): construction site → 3307 middle lane → three horizontal deepening track → three horizontal alleys → two overhead manned vehicles → two horizontal north big lanes → one overhead manned vehicle → one horizontal sidewalk → auxiliary shaft Bottom→ground
633 mining area transportation downhill (upper section): construction site → three horizontal roads → two overhead passenger cars → two horizontal north big lanes → one overhead manned vehicle → one horizontal sidewalk → auxiliary bottom hole → ground
73307 Zhongxiang→Yanshen Four-station→Deep-deep track downhill→Yanshen three-car yard→Depth-deep belt downhill (or deepening track downhill)→Three horizontal alleys→Two overhead manned vehicles→Two horizontal North Daxiang→One overhead People's car → a horizontal sidewalk → auxiliary bottom → ground
83308 Zhongxiang→Yanshen Four-station→Deep-deep track downhill→Yanshen three-vehicle→Deep-deep belt downhill (or deepening track downhill)→Three horizontal alleys→Two overhead manned vehicles→Two horizontal North alleys→One overhead People's car → a horizontal sidewalk → auxiliary bottom → ground
93306一å·â†’3306ä¸å··â†’Yanshen three-car yard→Depth-deep belt downhill (or deepening track downhill)→Three horizontal alleys→Two overhead manned vehicles→Two horizontal North Daxiang→An overhead manned vehicle→One horizontal sidewalk →Auxiliary bottom hole→ground
103305 Zhongxiang→Yanshen three-car yard→Depth-deep belt downhill (or deepening orbiting downhill)→Three horizontal alleys→Two overhead manned vehicles→Two horizontal North Daxiang→One overhead manned vehicle→One horizontal sidewalk→Auxiliary bottom hole →ground
(2) The evacuation route of the newly added construction head shall be subject to the operating procedures and measures of the head.
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