阅读说明：本技术 一种针对工作面顶板离层水害的地面抽水孔抽排方法 (Ground water pumping hole pumping and draining method aiming at working face top plate separation layer water damage ) 是由 张培森 张睿 段中稳 胡荣杰 闫奋前 王道坤 于 2020-08-14 设计创作，主要内容包括：本发明公开了一种针对工作面顶板离层水害的地面抽水孔抽排方法,本发明主要针对井下无法实现巨厚泥岩上仰泄水孔施工、地面透孔难度过大的情况设计。该方法首先应掌握该地层条件,判断离层发育位置、导水裂隙带发育高度,由工作面中央位置对应地面开设多个抽水钻孔,每隔200～300m即依靠地面钻机至上而下垂直施工钻孔,一级钻孔穿过开孔段松散层,打至基岩层底界以下10～20m；二级钻孔下厚壁花管至可能发育离层的地层底部10～20m,在工作面推进至距离工作面100m之前进行抽水孔的抽排工作,通过厚壁花管吸收含水层及离层中的水,并设置矿用深井潜水泵对其进行排水,实现对离层空间的抽排与截流,解决了工作面顶板离层积水的问题。(The invention discloses a ground water pumping hole pumping and draining method aiming at water damage of a working face roof separation layer, which is mainly designed aiming at the conditions that huge thick mudstone upward elevation water pumping hole construction cannot be realized underground and ground through holes are too difficult. Firstly, mastering the stratum condition, judging the position of the off-layer development and the development height of a water-flowing fractured zone, arranging a plurality of water pumping drill holes corresponding to the ground from the central position of a working surface, vertically constructing the drill holes at intervals of 200-300 m by a ground drilling machine from top to bottom, and drilling a primary drill hole to a position 10-20 m below the bottom boundary of a bedrock layer through a hole-opening section loose layer; the secondary drilling is carried out from the thick-wall perforated pipe to the bottom 10-20 m of the stratum where the separation layer is likely to develop, pumping and drainage work of a pumping hole is carried out before the working face is pushed to be 100m away from the working face, water in the aquifer and the separation layer is absorbed through the thick-wall perforated pipe, a mining deep well submersible pump is arranged to drain the water, pumping and intercepting of the separation layer space are achieved, and the problem of separation layer water accumulation of a top plate of the working face is solved.)

1. The utility model provides a ground suction hole pump drainage method to working face roof absciss layer water evil which characterized in that: the method comprises the following steps:

the method comprises the following steps: reasonably determining coal face parameters, grasping work face engineering, hydrogeological conditions and mining condition data, calculating the development height of a water guide crack zone after the mining of the work face, judging the development position of a separation layer, and analyzing the position of a water-bearing layer which has water filling influence on the separation layer;

step two: arranging a drilling machine at the center of the working surface and vertical to the ground surface along the propelling direction of the working surface;

step three: the drilling machine is used for constructing the variable-diameter water pumping drill hole (8) vertically downwards, the variable-diameter water pumping drill hole (8) comprises a primary drill hole and a secondary drill hole, the diameter of the primary drill hole is larger than that of the secondary drill hole, a thick-wall casing pipe (10) is embedded in the primary drill hole, and in order to prevent the influence of a loose layer (1) section on the thick-wall casing pipe (10), a cement paste full casing pipe (9) is adopted outside the thick-wall casing pipe (10) for;

step four: the aperture of the secondary drilling hole is determined according to the aquifer condition, the length of the hole section of the secondary drilling hole is determined according to the stratum condition, and in order to prevent the drilling hole from being damaged due to hole blocking and rock stratum movement, a thick-wall perforated pipe (12) is arranged in the secondary drilling hole, and water in the aquifer and the abscission layer which has water filling influence on the abscission layer is absorbed through the thick-wall perforated pipe (12);

step five: water in the aquifer and the abscission layer water accumulation area (13) enters a pumping hole through the hole wall of the thick-wall perforated pipe (12), in order to discharge the water in the pumping hole, a mining deep-well submersible pump (11) is installed in the pumping hole, and the mining deep-well submersible pump (11) discharges accumulated water;

step six: after the arrangement of the drill holes is finished, immediately carrying out dredging and descending work on the aquifer affected by water filling of the separation layer, and reducing the water level of the aquifer to be below a safety value to realize the closure of the separation layer supply; the separation layer is continuously developed along with the propulsion of the coal face, and after the separation layer is developed to the water pumping hole position, the water pumping hole pumps and drains the accumulated water in the separation layer, so that the threat of the water hazard of the separation layer is reduced.

2. The ground water pumping hole pumping and draining method aiming at the working face roof separation layer water damage as claimed in claim 1, is characterized in that: the drilling machine is arranged in the position, corresponding to the ground, of the center of the working face, and the interval between two drill holes is 200-300 m.

3. The ground water pumping hole pumping and draining method aiming at the working face roof separation layer water damage as claimed in claim 1, is characterized in that: the primary drilling hole is drilled to 10-20 m below the bottom boundary of the foundation layer (2); and the secondary drilling final hole is positioned 10-20 m below the bottom boundary of the stratum (3) which is likely to develop a separation layer.

4. The ground water pumping hole pumping and draining method aiming at the working face roof separation layer water damage as claimed in claim 1, is characterized in that: the deep well submersible pump (11) is installed inside the drilled hole, and the pumping and draining work of accumulated water inside the drilled hole is achieved.

5. The ground water pumping hole pumping and draining method aiming at the working face roof separation layer water damage as claimed in claim 1, is characterized in that: the ground water pumping hole conducts dewatering work on a water-filled aquifer in the separation space, the separation space is further developed when the working face is pushed forward, and then pumping and drainage work on the separation water accumulation area (13) is conducted.

6. The ground water pumping hole pumping and draining method aiming at the working face roof separation layer water damage as claimed in claim 1, is characterized in that: the ground water pumping holes are used for eliminating water damage of a coal seam (7) top plate separation layer, namely, before a coal face is pushed to a position 100m away from a certain ground water pumping hole, pumping and discharging of a drill hole are carried out, and when the face is pushed to a position 200m behind the drill hole, the drill hole is closed.

Technical Field

The invention belongs to the technical field of coal mining, and particularly relates to a ground water pumping hole pumping and draining method for water damage of a working face roof separation layer.

Background

Coal resources are an important component of national economy in China, but coal mine safety is seriously affected by five major disasters of mines such as gas, coal dust, water, fire, roof disasters and the like for a long time, and particularly the problem of mine water damage is increasingly prominent along with the continuous deepening of mining depth. Under the influence of factors such as geological structure conditions, hydrogeological conditions, chaotic exploitation and the like, the coal seam exploitation process in China becomes more complicated, and particularly when a roof is threatened by various water bodies, the roof water problem is very prominent. These mine water damages cause huge economic losses and adverse social effects, seriously threatening the safe production of coal resources. Light water inrush accidents can cause the water inrush working face to close production halt, the cost for draining water is increased rapidly, and the well is flooded seriously, thereby endangering the national property and the life safety of people.

Disclosure of Invention

In order to solve the defects of the technology, the invention provides a ground water pumping hole pumping and draining method aiming at the water hazard of the separation layer of the top plate of the working surface.

In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a ground suction hole pump drainage method to working face roof absciss layer water evil which characterized in that: the method comprises the following steps:

the method comprises the following steps: reasonably determining coal face parameters, grasping work face engineering, hydrogeological conditions and mining condition data, calculating the development height of a water guide crack zone after the mining of the work face, judging the development position of a separation layer, and analyzing the position of a water-bearing layer which has water filling influence on the separation layer;

step two: arranging a drilling machine at the center of the working surface and vertical to the ground surface along the propelling direction of the working surface;

step three: the drilling machine is used for vertically downwards constructing variable-diameter water pumping drill holes, the variable-diameter water pumping drill holes comprise primary drill holes and secondary drill holes, the diameter of the primary drill holes is larger than that of the secondary drill holes, thick-wall sleeves are embedded in the primary drill holes, and cement slurry full sleeves are adopted outside the thick-wall sleeves for isolation and sealing in order to prevent influence of loose layer sections on the thick-wall sleeves;

step four: determining the aperture of a secondary drilling hole according to the aquifer condition, determining the length of the hole section of the secondary drilling hole according to the stratum condition, and in order to prevent the drilling hole from being damaged due to hole blocking and rock stratum movement, putting a thick-wall perforated pipe into the secondary drilling hole, and absorbing water in the aquifer and the abscission layer which has water filling influence on the abscission layer through the thick-wall perforated pipe;

step five: water in the aquifer and the separation layer water accumulation area enters a pumping hole through the hole wall of the thick-wall perforated pipe, a mining deep well submersible pump is installed in the pumping hole for discharging the water in the pumping hole, and the mining deep well submersible pump discharges accumulated water;

step six: after the arrangement of the drill holes is finished, immediately carrying out dredging and descending work on the aquifer affected by water filling of the separation layer, and reducing the water level of the aquifer to be below a safety value to realize the closure of the separation layer supply; the separation layer is continuously developed along with the propulsion of the coal face, and after the separation layer is developed to the water pumping hole position, the water pumping hole pumps and drains the accumulated water in the separation layer, so that the threat of the water hazard of the separation layer is reduced.

Furthermore, the drilling machine is arranged in the center of the working face and corresponds to the ground, and the interval between two drill holes is 200-300 m.

Further, drilling holes in the primary drilling hole to 10-20 m below the bottom boundary of the bedrock layer; and the secondary drilling final hole is positioned 10-20 m below the bottom boundary of the stratum where the abscission layer can develop.

Furthermore, the deep well submersible pump is installed inside the drill hole, and the pumping and draining work of accumulated water inside the drill hole is achieved.

Furthermore, the ground pumping hole conducts dewatering work on the water-filled aquifer in the separation space, the separation space is further developed after the working face is pushed forward, and then pumping and drainage work on the separation water accumulation area is conducted.

Furthermore, the ground water pumping holes are used for eliminating water damage of a coal seam roof separation layer, namely, before the coal face is pushed to a position 100m away from a certain ground water pumping hole, the drilling hole is pumped and drained, and when the working face is pushed to a position 200m behind the drilling hole, the drilling hole is closed.

Compared with the prior art, the invention has the following beneficial effects: aiming at the water inrush hazard of a stope roof, the invention adopts the form of thick-wall perforated pipes under two drilled holes, and water in a water-bearing layer is absorbed or extruded by the perforated pipes, so that the phenomenon of hole blockage caused by the penetration of rock mass into the drilled holes can be avoided; the drilling hole adopts a deep well submersible pump to perform pumping and drainage work, the submersible pump has long continuous operation time and convenient installation, a special pump room does not need to be built, and the use and the maintenance are simple; carrying out water level dredging and descending work on a water-filled aquifer in the separation space, stopping the supply of underground water in the aquifer to the separation space, and carrying out pumping and draining work on the separated water when the working surface is pushed forward and the separation space is further developed; for a mine with geological characteristics of large mud-rock ratio and water burst in a separation layer in the stratum, the effect of draining water in advance can be achieved by adopting a ground water pumping drill hole.

Drawings

FIG. 1 is a cross-sectional view of a formation of the present invention taken at an angle to the coal seam.

FIG. 2 is a cross-sectional view of the strata along the strike direction of the coal seam in accordance with the present invention.

Fig. 3 is a cross-sectional view of a drainage bore hole of the present invention.

In the figure: 1. a loose layer; 2. a basal rock layer; 3. formations that may develop delamination; 4. a water barrier layer; 5. a water-conducting fractured zone; 6. a collapse zone; 7. a coal seam; 8. reducing water pumping and drilling; 9. a cement slurry full casing; 10. a thick-walled sleeve; 11. a deep well submersible pump; 12. thick-walled floral tubes; 13. and (4) a delamination water accumulation area.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The technical scheme provided by the invention as shown in figures 1-3 is that the ground water pumping hole pumping and draining method aiming at the water damage of the separation layer of the top plate of the working surface comprises the following steps:

the method comprises the following steps: reasonably determining coal face parameters, grasping work face engineering, hydrogeological conditions and mining condition data, calculating the development height of a water guide crack zone after the mining of the work face, judging the development position of a separation layer, and analyzing the position of a water-bearing layer which has water filling influence on the separation layer;

step two: arranging a drilling machine at the center of the working surface and vertical to the ground surface along the propelling direction of the working surface;

step three: the drilling machine is used for vertically downwards constructing a variable-diameter water pumping drilling hole 8, the variable-diameter water pumping drilling hole 8 comprises a primary drilling hole and a secondary drilling hole, the diameter of the primary drilling hole is larger than that of the secondary drilling hole, a thick-wall casing pipe 10 is embedded in the primary drilling hole, and in order to prevent the influence of the section 1 of the unconsolidated formation on the thick-wall casing pipe 10, a cement slurry full casing pipe 9 is adopted outside the thick-wall casing;

step four: the aperture of the secondary drilling hole is determined according to the aquifer condition, the length of the hole section of the secondary drilling hole is determined according to the stratum condition, in order to prevent the drilling hole from being damaged due to hole blocking and rock stratum movement, a thick-wall perforated pipe 12 is arranged in the secondary drilling hole, and water in the aquifer and the abscission layer which are influenced by water filling of the abscission layer is absorbed through the thick-wall perforated pipe 12;

step five: water in the aquifer and the separation layer water accumulation area 13 enters a pumping hole through the hole wall of the thick-wall perforated pipe 12, in order to discharge the water in the pumping hole, a mining deep-well submersible pump 11 is installed in the pumping hole, and the mining deep-well submersible pump 11 discharges accumulated water;

step six: after the arrangement of the drill holes is finished, immediately carrying out dredging and descending work on the aquifer affected by water filling of the separation layer, and reducing the water level of the aquifer to be below a safety value to realize the closure of the separation layer supply; the separation layer is continuously developed along with the propulsion of the coal face, and after the separation layer is developed to the water pumping hole position, the water pumping hole pumps and drains the accumulated water in the separation layer, so that the threat of the water hazard of the separation layer is reduced.

Preferably, the drilling machine is arranged at the position, corresponding to the ground, of the center of the working face, and the interval between two drill holes is 200-300 m.

Preferably, the primary drilling hole is drilled to 10-20 m below the bottom boundary of the foundation layer 2; and the secondary drilling final hole is positioned 10-20 m below the bottom boundary of the stratum 3 which is likely to develop a separation layer.

Preferably, the deep well submersible pump 11 is installed inside a borehole, and the pumping and draining work of accumulated water inside the borehole is realized.

Preferably, the ground pumping hole dredges water to the water-filled aquifer in the separation space, and when the working face is pushed forward, the separation space is further developed, and then pumping and drainage work of the separation water accumulation area is performed.

Preferably, the ground pumping holes are used for eliminating water damage of the coal seam 7 top plate separation layer, namely, before the coal face is pushed to be 100m away from a certain ground pumping hole, the drilling hole is pumped and drained, and when the working face is pushed to be 200m behind the drilling hole, the drilling hole is closed.

In the above, the working face, i.e. coal mining face, also called stope face, refers to the first production site of coal, i.e. the direct coal mining place.

The water-resisting layer 4 is a rock stratum or a soil layer with poor water permeability, generally composed of compact rocks or clay, and due to small gaps, underground water is not easy to permeate.

The caving zone 6 is a zone of rock formation where overburden is destroyed by mining and caving into a goaf, and has been called a caving zone.

The ground water pumping hole is divided into a first-stage drilling hole and a second-stage drilling hole, and the diameter of the first-stage drilling hole is larger than that of the second-stage drilling hole. The pore wall of one-level hole is equipped with thick wall sleeve pipe 10, has the reinforced effect, adopts grout to keep apart in basement rock stratum 2 and seals in the stratum, prevents that the drilling from blockking up, and the pore wall of second grade hole is equipped with thick wall floral tube 12 for absorb the water in absciss layer and the aquifer.

Calculating the initial closed position of the top plate separation layer and the periodic closed position of the separation layer of the coal seam 7 according to the rock stratum structure of the overlying strata, determining the specific position of a first water pumping hole and the specific distance between other adjacent water pumping holes according to the initial closed position of the separation layer and the periodic closed position of the separation layer, and constructing a plurality of ground water pumping holes one by one from the cutting hole of the working face to the direction of a mining stopping line in the advancing process of the coal mining working face.

The ground pumping drainage is mainly designed aiming at the conditions that the construction of a huge mud rock upward facing drain hole cannot be realized underground and the difficulty of ground through holes is overlarge. For example, in the saggar coal mine in the Yonggan mining area, because the thickness of the upper stable group of the working face reaches 170m, most of the stable group is mudstone, the softening coefficient only reaches 0.25-0.6, the softening property is strong, the mudstone section of the upper stable group in the stratum of the mining area is hard to pass through, a borehole can be designed to be constructed on the ground to reach the upper separation space of the stable group, a secondary borehole is adopted to descend the thick-wall floral tube 12 to be matched with the deep-well submersible sand pump 11 to dredge the water level of the aquifer, the possibly expanded separation space is intercepted, and when the separation space is expanded along with the propulsion of the working face, the separation accumulated water is dredged, the separation water quantity is reduced, and the pressure of the separation water is reduced.