Water retaining wall structure for treating caving and water inrush well flooding of working face and construction method

Abstract

The invention discloses a retention wall structure for treating a working face caving water inrush well flooding and a construction method, and belongs to the technical field of water inrush treatment. The system comprises a roadway, a flooded working face is arranged in the roadway, and the roadway is divided into two areas by the flooded working face, namely a conventional roadway and a flooded roadway; a treatment tunnel face is arranged in the conventional roadway; a retention wall construction grouting hole is formed in the center of the treatment tunnel face; a plurality of water-retaining wall roof-contacted grouting holes are formed in a top plate of the treatment tunnel face at intervals; and the retention wall construction grouting holes and the retention wall roof-contacted grouting holes horizontally penetrate through the conventional roadway and extend to the flooded working face from the treatment tunnel face. According to the construction method, the multiple drill holes are constructed in the center of the governed tunnel face and the roof to penetrate through the roadway, the cement-water glass double-liquid slurry is poured to construct the retention wall, the construction process is safe and reliable, the cost is low, the technology is simple, and the construction method has important significance on underground mine safety construction.

Description

Technical Field

[0001] The present invention relates to the technical field of water inrush control, and more specifically, to a water retaining wall structure and construction method for controlling water inrush and flooding in a caving face of a working face. Background Art

[0002] In underground mine mining operations, water inrush due to caving in the working face is a common disaster. Once the water inrush volume exceeds the mine drainage capacity, it will cause the mine to be flooded, seriously threatening the lives of miners and the production safety of the mine. Existing methods for controlling water inrush and flooding in mines generally adopt the methods of pumping water with large pump capacity and grouting sealing through surface directional drilling.

[0003] The method of pumping water with large pump capacity generally involves constructing a water retaining wall in the working face to seal the water inrush point after forcibly draining the water, and then grouting to seal the caving water inrush point. It requires the pump capacity to be much larger than the water inrush volume, and the water inrush volume to be stable. However, water inrush due to caving in the working face is often caused by weak and broken roof surrounding rock. Under the action of the seepage force of the surrounding aquifer water, it gradually becomes unstable and caves. During the process of pumping water with large pump capacity, the hydraulic seepage scouring is greatly aggravated, thus increasing the caving range and water inrush volume, and there is a risk of secondary flooding of the mine. There are huge safety hazards in underground operations.

[0004] The method of surface directional drilling grouting is to construct a directional drilling to the position of the water inrush point, and then grout for sealing. Since the water inrush point is connected to the roadway, a large amount of grout is lost in the roadway, resulting in high treatment costs and great difficulty in later roadway cleaning.

[0005] Therefore, seeking a safe, reliable, low-cost and simple process water inrush control method is of great significance for the safe construction of underground mines. Summary of the Invention

[0006] 1. Technical Problems to be Solved by the Invention

[0007] Aiming at the defects and deficiencies existing in the prior art, the present invention provides a water retaining wall structure and construction method for controlling water inrush and flooding in a caving face of a working face. The present invention constructs a water retaining wall by drilling multiple holes through the roadway at the center and roof of the treatment working face at a certain safe distance from the caving and flooded heading face, and pouring a cement-sodium silicate double-fluid slurry. The construction process is safe, reliable, low-cost and simple, and is of great significance for the safe construction of underground mines.

[0008] 2. Technical Solutions

[0009] To achieve the above object, the technical solution provided by the present invention is as follows:

[0010] A water retaining wall structure for controlling water inrush and flooding in a caving face of a working face according to the present invention includes a roadway, in which there is a flooded working face, and the flooded working face divides the roadway into two areas, namely a normal roadway and a flooded roadway;

[0011] There is a caving collapse body in the flooded roadway, a water retaining wall is built on the caving collapse body, and a grouting stone body in the caving zone is filled above the water retaining wall;

[0012] There is a treatment face in the conventional roadway; a water retaining wall construction grouting hole is opened at the center of the treatment face; a plurality of water retaining wall roof connecting grouting holes are spaced apart at the roof of the treatment face;

[0013] The water retaining wall construction grouting hole and the water retaining wall roof connecting grouting hole respectively penetrate the conventional roadway horizontally and extend from the treatment face to the flooded working face;

[0014] A plurality of water inrush point grouting holes are also spaced apart at the roof of the treatment face.

[0015] Furthermore, the rock pillar on the side of the treatment face close to the flooded working face is a grout plug, and the thickness of the grout plug is 4 - 8 m.

[0016] Furthermore, the orifice pipes of the water retaining wall construction grouting hole, the water retaining wall roof connecting grouting hole, and the water inrush point grouting hole are all buried and reinforced on the grout plug.

[0017] Furthermore, there is a safety distance between the flooded working face and the treatment face, and the safety distance is determined by the following formula:

[0018]

[0019] In the above formula, M is the roadway height, in m;

[0020] K is the safety factor;

[0021] P is the hydrostatic pressure borne by the flooded working face, in mPa;

[0022] K P is the shear strength of the roadway surrounding rock, in mPa.

[0023] Furthermore, the water inrush point grouting hole extends from the treatment face 1 to the flooded working face and is inclined upward at 5 - 10 degrees.

[0024] Furthermore, a water retaining wall is constructed in the flooded working face by injecting cement-sodium silicate double-fluid slurry into the water retaining wall construction grouting hole, and the roof of the water retaining wall is grouted for roof connection reinforcement through the water retaining wall roof connecting grouting hole.

[0025] A construction method for a water retaining wall structure for treating roof caving, water inrush and flooding in a working face includes the following steps:

[0026] Step 1: Construct a water retaining wall;

[0027] In a two-way excavation roadway, several boreholes are drilled through the roadway at the center and roof of the control heading on the opposite side at a certain safe distance from the caving and flooded heading face, and a water stop wall is constructed by injecting a cement-sodium silicate double-fluid grout.

[0028] The construction steps of the water stop wall grouting with cement-sodium silicate double-fluid grout are as follows:

[0029] a) First, construct a water stop wall grouting hole that penetrates horizontally at the center of the control heading face, and inject the cement-sodium silicate double-fluid grout until the grouting pressure rises to twice the hydrostatic pressure.

[0030] b) Ream the water stop wall grouting hole to penetrate through the water stop wall and determine the thickness of the water stop wall. If the thickness of the water stop wall is less than 10 m, continue to inject the cement-sodium silicate double-fluid grout according to step a. If the thickness of the water stop wall is greater than or equal to 10 m, grout and seal the hole.

[0031] c) Construct several horizontally penetrating water stop wall roof-connecting grouting holes on the roof of the control heading face 1, and inject the cement-sodium silicate double-fluid grout to conduct roof-connecting reinforcement grouting for the water stop wall.

[0032] Step 2: Arrange several water inrush point grouting holes on the roof of the control heading face roadway, with the upward angle of the boreholes being 5-10°, and inject cement slurry to conduct filling grouting reinforcement for the caving zone.

[0033] Step 3: Ream open the water stop wall grouting hole to drain water and verify the treatment effect.

[0034] Furthermore, the mixing ratio of the cement-sodium silicate double-fluid grout is that the water-solid ratio of the used cement slurry is 1:1, the volume ratio of the cement slurry to the sodium silicate solution is mixed evenly at 1:1, and the Baumé degree of the sodium silicate solution is 38-40°.

[0035] 3. Beneficial effects

[0036] Adopting the technical solution provided by the present invention, compared with the prior art, it has the following beneficial effects:

[0037] The present invention constructs a water stop wall by drilling several boreholes through the roadway at the center and roof of the control heading face on the opposite side at a certain safe distance from the caving and flooded heading face and injecting a cement-sodium silicate double-fluid grout. The construction process is safe and reliable, the cost is low, and the process is simple, which is of great significance to the safe construction of underground mines. Description of the drawings

[0038] Figure 1 is the overall structure diagram of the present invention;

[0039] Figure 2 is the effect diagram of the opening of the control heading face of the present invention;

[0040] In the figure: 1, the treatment heading face; 2, the grouting rock cap for water stoppage; 3, the grouting holes for water inrush points; 4, the grouting holes for the top connection of the water retaining wall; 5, the grouting holes for the construction of the water retaining wall; 6, the roadway; 601, the flooded working face; 602, the normal roadway; 603, the flooded roadway; 7, the grouting stone body in the caving zone; 8, the caving and collapsing body; 9, the water retaining wall. Specific implementation manner

[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0042] Embodiment 1

[0043] From Figure 1-2 It can be seen that a water retaining wall structure for treating the caving and water inrush flooding of a working face in this embodiment includes a roadway 6. There is a flooded working face 601 in the roadway 6. The flooded working face 601 divides the roadway 6 into two areas, namely the normal roadway 602 and the flooded roadway 603;

[0044] There is a caving and collapsing body 8 in the flooded roadway 603. A water retaining wall 9 is constructed on the caving and collapsing body 8, and a grouting stone body 7 in the caving zone is filled above the water retaining wall 9;

[0045] There is a treatment heading face 1 in the normal roadway 602; a grouting hole 5 for the construction of the water retaining wall is opened at the center of the treatment heading face 1; a plurality of grouting holes 4 for the top connection of the water retaining wall are spaced apart and opened at the roof of the treatment heading face 1;

[0046] The grouting hole 5 for the construction of the water retaining wall and the grouting hole 4 for the top connection of the water retaining wall respectively penetrate the normal roadway 602 horizontally and extend from the treatment heading face 1 to the flooded working face 601;

[0047] A plurality of grouting holes 3 for water inrush points are also spaced apart and opened at the roof of the treatment heading face 1.

[0048] The rock pillar on the side of the treatment heading face 1 adjacent to the flooded working face 601 is the grouting rock cap 2 for water stoppage, and the thickness of the grouting rock cap 2 is 4 - 8 m.

[0049] The orifice pipes of the grouting hole 5 for the construction of the water retaining wall, the grouting hole 4 for the top connection of the water retaining wall, and the grouting hole 3 for water inrush points are all buried and reinforced on the grouting rock cap 2 for water stoppage.

[0050] There is a safety distance between the flooded working face 601 and the treatment heading face 1. The safety distance is determined by the following formula:

[0051]

[0052] In the above formula, M is the roadway height, with the unit of m;

[0053] K is the safety factor;

[0054] P is the hydrostatic pressure borne by the flooded heading face, with the unit of mPa;

[0055] K P is the shear strength of the roadway surrounding rock, with the unit of mPa.

[0056] The grouting hole 3 for the water inrush point extends from the treatment heading face 1 to the flooded working face 601 and inclines upward at an angle of 5-10 degrees.

[0057] By injecting the cement-sodium silicate double-fluid slurry into the grouting hole 5 for constructing the water retaining wall, a water retaining wall 9 is constructed in the flooded working face 601, and the roof of the water retaining wall 9 is reinforced by grouting through the roof grouting hole 4 for the water retaining wall.

[0058] Embodiment 2

[0059] From Figure 1-2 It can be seen that a construction method for the water retaining wall structure for treating the roof fall, water inrush and flooding of the working face in this embodiment includes the following steps:

[0060] Step 1: Construct the water retaining wall 9;

[0061] In a two-way driving construction roadway 6, a plurality of boreholes are drilled through the roadway 6 at the center and roof of the treatment heading face 1 on the opposite side at a certain safe distance from the roof fall and flooded heading face, and a water retaining wall 9 is constructed by injecting the cement-sodium silicate double-fluid slurry.

[0062] The construction steps of the cement-sodium silicate double-fluid slurry water retaining wall grouting are as follows:

[0063] a) First, a horizontally penetrating grouting hole 5 for constructing the water retaining wall is drilled at the center of the treatment heading face 1, and the cement-sodium silicate double-fluid slurry is injected until the grouting pressure rises to twice the hydrostatic pressure;

[0064] b) Ream the grouting hole 5 for constructing the water retaining wall, ream through the water retaining wall 9 to determine the thickness of the water retaining wall 9. If the thickness of the water retaining wall 9 is less than 10 m, continue to inject the cement-sodium silicate double-fluid slurry according to step a; if the thickness of the water retaining wall 9 is greater than or equal to 10 m, grout and seal the hole;

[0065] c) Three horizontally penetrating roof grouting holes 4 for the water retaining wall are drilled at the roof of the treatment heading face 1, and the cement-sodium silicate double-fluid slurry is injected to reinforce the roof of the water retaining wall 9 by grouting.

[0066] Step 2: Arrange two grouting holes 3 for the water inrush point at the roof of the treatment heading face roadway, with the upward angle of the borehole being 5-10°, and inject cement slurry to fill and grout-reinforce the caving zone;

[0067] Step 3: Ream the grouting hole 5 for constructing the water retaining wall to drain water and verify the treatment effect.

[0068] The mixing ratio of the cement-sodium silicate double-fluid grout is as follows: the water-solid ratio of the used cement grout is 1:1, the volume ratio of the cement grout to the sodium silicate solution is mixed evenly at 1:1, and the Baume degree of the sodium silicate solution is 38-40°.

[0069] The present invention relates to the technical field of mine water control and roof water inrush treatment, and particularly relates to a water retaining wall and method for treating the sudden water inrush and flooding of a working face due to caving.

[0070] The present invention constructs a water retaining wall 9 by pouring cement-sodium silicate double-fluid grout through constructing multiple boreholes penetrating the roadway 6 at the center and roof of the treatment face 1 on the opposite side at a certain safe distance from the caved and flooded heading face. The construction process is safe and reliable, low in cost, and simple in technology, and is of great significance to the safe construction of underground mines.

[0071] The above has schematically described the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and design similar structural modes and embodiments without creative efforts without departing from the gist of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. A water retaining wall structure for controlling sudden water inrush and flooding of a caving face in a working face, including a roadway (6), characterized in that: A flooded working face (601) is provided in the roadway (6). The flooded working face (601) divides the roadway (6) into two areas, namely a normal roadway (602) and a flooded roadway (603). A caving and collapse body (8) is provided in the flooded roadway (603). A water retaining wall (9) is constructed on the caving and collapse body (8), and a grouting stone body (7) in the caving zone is filled above the water retaining wall (9). A treatment face (1) is provided in the normal roadway (602). A water retaining wall construction grouting hole (5) is opened at the center of the treatment face (1). A plurality of water retaining wall roof connecting grouting holes (4) are spaced apart at the roof of the treatment face (1). The water retaining wall construction grouting hole (5) and the water retaining wall roof connecting grouting hole (4) horizontally penetrate the normal roadway (602) respectively and extend from the treatment face (1) to the flooded working face (601). A plurality of water inrush point grouting holes (3) are also spaced apart at the roof of the treatment face (1).

2. The water retaining wall structure for controlling the sudden flooding of a well caused by the caving of the working face according to claim 1, characterized in that: A plugging rock cap (2) is provided at the rock pillar on the side of the treatment face (1) adjacent to the flooded working face (601). The thickness of the plugging rock cap (2) is 4 - 8m.

3. The water retaining wall structure for controlling sudden water inrush from caving in the working face as claimed in claim 2, wherein: The orifice pipes of the water retaining wall construction grouting hole (5), the water retaining wall roof connecting grouting hole (4), and the water inrush point grouting hole (3) are buried and reinforced on the plugging rock cap (2).

4. A water retaining wall structure for controlling sudden water inrush and flooding of a working face caving area, characterized in that: A safety distance is provided between the flooded working face (601) and the treatment face (1). The safety distance is determined by the following formula: In the above formula, M is the roadway height, with the unit of m; K is the safety factor; P is the hydrostatic pressure borne by the flooded working face, with the unit of mPa; K P is the shear strength of the surrounding rock of the roadway, with the unit of mPa.

5. The water retaining wall structure for controlling the sudden water flooding of the caving face and shaft collapse according to claim 1, characterized in that: The water inrush point grouting hole (3) extends from the treatment face (1) to the flooded working face (601) and has an upward inclination of 5 - 10 degrees.

6. The water retaining wall structure for controlling the sudden flooding of a well caused by the caving of the working face according to claim 1, wherein: A water retaining wall (9) is constructed on the flooded working face (601) by injecting a cement-sodium silicate double-fluid grout into the water retaining wall construction grouting hole (5). The roof of the water retaining wall (9) is reinforced by grouting through the water retaining wall roof connecting grouting hole (4).

7. The construction method of a water retaining wall structure for controlling sudden water inrush and flooding of a working face caving, as claimed in claim 5, is characterized in that: It includes the following steps: Step 1: Construct a water retaining wall (9); In a two-way driving roadway (6), a plurality of boreholes are drilled through the roadway (6) at the center and roof of the treatment face (1) on the opposite side at a certain safety distance from the caving and flooded working face, and a water retaining wall (9) is constructed by injecting a cement-sodium silicate double-fluid grout. The construction grouting steps for the cement-sodium silicate double-fluid grout water retaining wall are as follows: a) First, a horizontally penetrating water retaining wall construction grouting hole (5) is drilled at the center of the treatment face (1), and a cement-sodium silicate double-fluid grout is injected until the grouting pressure rises to twice the hydrostatic pressure. b) The water retaining wall construction grouting hole (5) is reamed to penetrate the water retaining wall (9) to determine the thickness of the water retaining wall (9). If the thickness of the water retaining wall (9) is less than 10m, continue to inject the cement-sodium silicate double-fluid grout according to step a). If the thickness of the water retaining wall (9) is greater than or equal to 10m, grout and seal this hole. c) A plurality of horizontally penetrating water retaining wall roof connecting grouting holes (4) are drilled at the roof of the treatment face (1), and a cement-sodium silicate double-fluid grout is injected to reinforce the roof of the water retaining wall (9) by grouting. Step 2: Arrange multiple water inrush point grouting holes (3) on the roof of the heading face roadway for treatment. The upward angle of the drilled holes is 5-10°, and cement slurry is poured to fill and grout the caving zone for reinforcement. Step 3: Sweep away the water retaining wall to construct a grouting hole (5) for water release and verify the treatment effect.

8. The construction method of a water retaining wall structure for controlling sudden water inrush and flooding of a caving face, as claimed in claim 7, is characterized in that: The mixing ratio of the cement-sodium silicate double-fluid slurry is that the water-solid ratio of the used cement slurry is 1:1, the volume ratio of the cement slurry to the sodium silicate solution is mixed evenly at 1:1, and the Baume degree of the sodium silicate solution is 38-40°.

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