Separation treatment method for water guide collapse column

Abstract

The invention provides a water diversion collapse column separation treatment method. The treatment method comprises the following steps: step S101, determining a collapse column plane and a vertical direction range; s102, exploring the development depth of the collapse column in the vertical direction; s103, exploring the overall development geometric morphology of the collapse column; s104, an isolation curtain is constructed on the periphery of the collapse column; s105, ground main drill holes are formed in the isolation curtain, horizontal branch drill holes are formed through the ground main drill holes, and the ground main drill holes enter a too grey water layer position and an Ordovician grey water layer position which are communicated with the collapse columns for grouting transformation; s106, the water-resisting layer in the collapse column is detected and analyzed, horizontal branch drilling is conducted from the ground main drilling hole to the water-resisting layer, and grouting reinforcement is conducted on the water-resisting layer; and S107, when the water guiding safety of the collapse column reaches the standard, working face mining work is conducted. According to the treatment method, it is guaranteed that the structure is more stable after the collapse column in the underground mining area is treated, better waterproofness and higher safety are achieved, and therefore safe mining of the working face can be guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of safe mining of coal mines, and in particular relates to a method for separating and controlling water-conducting subsidence columns. Background Art

[0002] The collapse column is a special geological structure in North my country. The collapse column is formed by the collapse and destruction of karst rock mass due to water dissolution. A comprehensive analysis of the collapse column water inrush data that has occurred in major mining areas in North China and South China shows that there are three basic conditions for the collapse column to become a vertical water inrush channel: 1. The karst aquifer where the collapse column is located is rich in water; 2. There must be a certain head pressure; 3. The collapse column is poorly cemented and has good water conductivity. Usually, the water channel of the collapse column water disaster is composed of the coal seam floor and the collapse column. Some collapse columns can even directly become the water channel between the coal seam and the aquifer.

[0003] In the prior art, if the mining project is close to the strong water-containing collapse column, if the water-gushing boreholes that communicate with the strong water-containing collapse column cannot be effectively controlled, or if the surrounding rock area of ​​the strong water-containing collapse column is destroyed by repeated drilling, the stress field of the surrounding rock of the geological anomaly body will change under the combined effect of water flow scouring and other factors, the range of the stress drop zone will expand, the water conductivity of the surrounding rock will increase, and the ability to prevent and restrict the flow of groundwater will be weakened, thereby forming a water inrush channel and causing water inrush. It can be seen that the impact of mining is a major cause of water inrush accidents in collapse columns. The mining process destroys the original equilibrium state of the collapse column, breaks through the key strata therein and forms water inrush. The essence of the mining process's destruction of the water-filled collapse column is that the collapse column is under the interaction of the mining stress field and the seepage field, and the seepage pressure causes the collapse column surrounding rock to produce strain. At the same time, the strain formed by the mining work will also cause changes in the seepage coefficient, thereby forming a coupling between the seepage field and the stress and strain field, which will have a greater impact on the safe mining of coal mines.

[0004] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0005] The object of the present invention is to provide a method for separating and managing water-conducting subsidence columns, so as to at least solve the above-mentioned problems existing in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A method for separating and treating water-conducting subsidence columns, the method comprising the following steps:

[0008] Step S101, conducting ground three-dimensional seismic survey to preliminarily determine the plane and vertical range of the collapse column;

[0009] Step S102, performing ground drilling exploration within the initially determined range of the collapse column to explore the vertical development depth of the collapse column;

[0010] Step S103, further exploring the overall development geometry of the collapse column within the underground mining area;

[0011] Step S104: according to the overall geometric development of the collapse column, an isolation curtain is applied on the periphery of the collapse column, wherein the isolation curtain is used to surround the collapse column to isolate it from the periphery;

[0012] Step S105, constructing a main ground borehole in the isolation curtain, and constructing horizontal branch boreholes from the main ground borehole, and the multiple horizontal branch boreholes respectively enter the Taihu ash water layer and the Ordovician ash water layer connected by the collapse column to perform grouting transformation;

[0013] Step S106, detecting and analyzing the waterproof layer in the collapsed column, if the waterproof property of the waterproof layer does not meet the required standard, drilling horizontal branch holes from the main ground borehole to the waterproof layer, and grouting the waterproof layer for reinforcement;

[0014] Step S107, conduct water conduction safety exploration and evaluation on the subsidence column. If the water conduction safety of the subsidence column meets the standard, then proceed with the mining work on the working face.

[0015] In the water-conducting subsidence column separation and treatment method as described above, preferably, the isolation curtain is formed by enclosing a plurality of grouting boreholes, and the slurry penetration ranges of two adjacent grouting boreholes have mutually overlapping parts.

[0016] In the water-conducting subsidence column separation and treatment method as described above, preferably, a sealing pile is provided between two adjacent grouting boreholes, and the sealing pile and the slurry penetration range of the two adjacent grouting boreholes have overlapping parts.

[0017] In the water-conducting subsidence column separation and treatment method as described above, preferably, the sealing piles are bored cast-in-place piles or cement mixing piles.

[0018] In the method for separating and treating water-conducting collapsed columns as described above, preferably, in step S107, the water-conducting safety of the collapsed columns is detected and evaluated by ground drilling in combination with transient electromagnetic method. If it is detected that there are parts in the collapsed columns that do not meet the water-conducting safety standards, supplementary grouting treatment is performed on the parts in the collapsed columns that do not meet the standards.

[0019] In the water-conducting subsidence column separation and treatment method as described above, preferably, a hole is drilled from the ground to the substandard part of the subsidence column, and a grouting rod is inserted into the drilled hole, and the grouting rod reaches the substandard part of the subsidence column to perform grouting operations.

[0020] In the water-conducting subsidence column separation and treatment method as described above, preferably, the grouting rods are inserted at the shallowest depth in the Taihui water layer, and at the deepest depth in the Aohui water layer, and the grouting rods are all located within the vertical projection range of the subsidence column.

[0021] In the water-conducting subsidence column separation and treatment method as described above, preferably, in step S101, the plane and vertical range of the subsidence column includes the plane extension range of the subsidence column and the underground extension depth of the subsidence column.

[0022] In the water-conducting subsidence column separation and treatment method as described above, preferably, in step S102, the vertical development depth of the subsidence column includes the positional relationship of the subsidence column in the vertical direction between the Taihui water layer, the aquiclude and the Aohui water layer.

[0023] In the water-conducting subsidence column separation and treatment method as described above, preferably, the outer periphery of the subsidence column geometric shape is within a range of 30 to 50 meters from the isolation curtain.

[0024] Beneficial effects:

[0025] In this treatment method, the isolation curtain can not only prevent the surrounding rock of the sinkhole column from deformation and collapse, but also play a role of water isolation and template. Grouting inside the isolation curtain can prevent the grouting liquid from escaping everywhere, so that the grouting inside the sinkhole column can achieve better treatment effect, ensuring that the structure of the sinkhole column in the underground mining area is more stable after treatment, and has better waterproofness and higher safety, thereby ensuring safe mining of the working face.

[0026] Directional grouting is carried out on the Taihui water layer and the Aohui water layer to isolate the hydraulic connection between the two layers and better control the collapse column. Grouting treatment of the water-proof layer can further ensure that there will be no water inrush in the collapse column, ensure the control effect, and improve safety.

[0027] The sealing piles can better seal the intersection of the slurry penetration ranges of two adjacent grouting boreholes, ensure that the isolation curtain has better water-proof properties, and further reduce the disturbance effect of the collapse column in the isolation curtain on the surrounding rock and the underground mining area. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0029] Figure 1 A vertical cross-sectional view of a water-conducting subsidence column treatment according to an embodiment of the present invention;

[0030] Figure 2The figure is a top view of the water-conducting subsidence column management according to one embodiment of the present invention.

[0031] In the figure: 1. Main borehole; 2. Horizontal branch borehole; 3. Grouting rod; 4. Grouting borehole; 5. Grout penetration range; 6. Sealing pile. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0033] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0035] According to a specific embodiment of the present invention, Figure 1-2 As shown, the present invention provides a method for separating and managing water-conducting subsidence columns, and the management method comprises the following steps:

[0036] Step S101, conduct ground three-dimensional seismic survey to preliminarily determine the plane and vertical range of the collapse column; in step S101, the plane and vertical range of the collapse column include the plane extension range of the collapse column and the underground extension depth of the collapse column.

[0037] Step S102, conduct ground drilling exploration within the preliminarily determined range of the collapse column to explore the vertical development depth of the collapse column; in step S102, the vertical development depth of the collapse column includes the positional relationship between the collapse column and the Taihui water layer, the aquiclude, and the Ordovician gray water layer in the vertical direction.

[0038] Step S103, further exploring the overall development geometry of the subsidence column within the underground mining area; in this embodiment, the spatial development geometry of the subsidence column is further explored in combination with the transient electromagnetic method;

[0039] Step S104: construct an isolation curtain on the periphery of the collapse column according to the overall geometric shape of the collapse column, and the isolation curtain is used to surround the collapse column to isolate it from the periphery.

[0040] Step S105, construct a ground main borehole 1 in the isolation curtain, and construct horizontal branch boreholes 2 from the ground main borehole 1, and multiple horizontal branch boreholes 2 respectively enter the Taihui water layer and the Aohui water layer conducted by the collapse column for grouting transformation. In this embodiment, the Taihui water layer and the Aohui water layer conducted by the collapse column are directional drilled and grouted to isolate the hydraulic connection between the two layers, ensure that the water with a certain pressure in the Taihui water layer and the Aohui water layer will not enter the collapse column, so that the collapse column is better managed.

[0041] Step S106, detect and analyze the waterproof layer in the collapsed column. If the waterproof property of the waterproof layer does not meet the required standard, drill a horizontal branch hole 2 from the main ground borehole 1 to the waterproof layer, and perform grouting to reinforce the waterproof layer. In this embodiment, the grouting treatment of the waterproof layer belongs to reinforcement treatment, which can further ensure that there will be no water inrush in the collapsed column, ensure the treatment effect, and improve safety.

[0042] Step S107, conduct water conduction safety exploration and evaluation on the subsidence column. If the water conduction safety of the subsidence column meets the standard, then proceed with the mining work on the working face.

[0043] In the water-conducting subsidence column separation and control method, the approximate location of the subsidence column is first determined through three-dimensional seismic survey, and the plane range and vertical range of the subsidence column are preliminarily determined; then, ground drilling exploration is carried out within the preliminarily determined range of the subsidence column, and the depth information of the development of the subsidence column is explored through ground drilling; then, the spatial morphology of the subsidence column affecting the scope of the underground mining area is explored through the transient electromagnetic method, so as to determine the spatial development morphology of the subsidence column affecting the underground mining area; that is, the control method successively explores the geometric morphology of the subsidence column affecting the underground mining area through the cooperation of three-dimensional seismic survey, ground drilling and transient electromagnetic method.

[0044] After investigating the geometric shape of the sinkhole column within the underground mining area, an isolation curtain is constructed around the geometric shape of the sinkhole column. The isolation curtain can not only prevent the surrounding rock of the sinkhole column from deformation and collapse, but also play a role in water isolation and template. Grouting inside the isolation curtain can prevent the grouting liquid from escaping everywhere, so that the grouting inside the sinkhole column can achieve better treatment effect, ensuring that the structure of the sinkhole column in the underground mining area is more stable after treatment, and has better waterproofness and higher safety, thereby ensuring safe mining of the working face.

[0045] The isolation curtain is formed by enclosing a plurality of grouting boreholes 4, and the grout penetration ranges 5 of two adjacent grouting boreholes 4 have mutually overlapping parts. In one embodiment of the present application, a circle of grouting boreholes 4 is set around the periphery of the collapse column, and the grout penetration ranges 5 of two adjacent grouting boreholes 4 overlap each other, so that after grouting, the circle of grouting boreholes 4 surrounds the collapse column and solidifies into a firm and waterproof grouting curtain, which surrounds and isolates the collapse column; thereby directly reducing the range of disturbance caused by the collapse column to affect the surrounding rock.

[0046] A sealing pile 6 is provided between two adjacent grouting boreholes 4, and the sealing pile 6 and the slurry penetration range 5 of the two adjacent grouting boreholes 4 have mutually overlapping parts. In one embodiment of the present application, a sealing pile 6 is provided between two adjacent grouting boreholes 4, and the sealing pile 6 and the slurry penetration range 5 of the two adjacent grouting boreholes 4 overlap each other, that is, the sealing pile 6 can better seal the intersection of the slurry penetration range 5 of the two adjacent grouting boreholes 4, so that the isolation curtain forms a better sealed whole, improves the overall structural strength of the isolation curtain, and ensures that the isolation curtain has better water-proof performance, and further reduces the disturbance effect of the subsidence column in the isolation curtain on the surrounding rock and the underground mining area.

[0047] The sealing pile 6 is a bored cast-in-place pile or a cement mixing pile. In one embodiment of the present application, the bored cast-in-place pile and the cement mixing pile have a wide range of applicability, higher structural strength, and good sealing performance, which can not only improve the overall structural strength of the isolation curtain, but also ensure that a better seal can be obtained between two adjacent grouting boreholes 4, ensuring that the isolation curtain has better water-proof sealing performance.

[0048] In step S107, the water conduction safety of the collapsed column is explored and evaluated by ground drilling in combination with transient electromagnetic method. If it is detected that there are parts in the collapsed column that do not meet the water conduction safety standards, the substandard parts in the collapsed column are supplemented with grouting treatment. In one embodiment of the present application, several positions are selected within the geometric range of the collapsed column for ground drilling exploration, and at the same time, the transient electromagnetic method is used for detection. If the slurry coagulation effect of individual parts in the collapsed column is poor, resulting in poor structural strength of individual parts in the collapsed column, but strong water conductivity, the position of the collapsed column with treatment defects is supplemented with grouting treatment, so that the collapsed column within the underground mining area is well treated as a whole, ensuring that the treated collapsed column has high overall structural strength, low water conductivity, and good safety, so that the treated collapsed column will not affect the safe mining of the underground working face.

[0049] A hole is drilled from the ground to the non-standard part of the collapsed column, and a grouting rod 3 is inserted into the drilled hole, and the grouting rod 3 directly reaches the non-standard part of the collapsed column for grouting. In one embodiment of the present application, the grouting rod 3 is directly inserted into the non-standard part of the collapsed column for grouting, which ensures the accuracy of the supplementary grouting and can prevent the slurry from escaping everywhere and the non-standard part from being fully grouted.

[0050] In this embodiment, the shallowest insertion depth of the grouting rod 3 is located in the Taihui water layer, and the deepest insertion depth of the grouting rod 3 is located in the Aohui water layer. The grouting rod 3 is located within the vertical projection range of the collapse column.

[0051] The outer periphery of the collapse column geometry is 30 to 50 meters away from the isolation curtain. In one embodiment of the present application, the isolation curtain is expanded to surround the collapse column, which can ensure that the isolation curtain completely surrounds the collapse column, thereby reducing the disturbance effect of the collapse column on the surrounding rock and the underground mining area within the isolation curtain.

[0052] It should be understood that the above description is merely exemplary and the embodiments of the present application do not limit this.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A method for separating and treating water-conducting subsidence columns, characterized in that: The governance method comprises the following steps: Step S101, conducting ground three-dimensional seismic survey to preliminarily determine the plane and vertical range of the collapse column; Step S102, performing ground drilling exploration within the initially determined range of the collapse column to explore the vertical development depth of the collapse column; Step S103, further exploring the overall development geometry of the collapse column within the underground mining area; Step S104: according to the overall geometric development of the collapse column, an isolation curtain is applied on the periphery of the collapse column, wherein the isolation curtain is used to surround the collapse column to isolate it from the periphery; Step S105, constructing a main ground borehole in the isolation curtain, and constructing horizontal branch boreholes from the main ground borehole, and the multiple horizontal branch boreholes respectively enter the Taihu ash water layer and the Ordovician ash water layer connected by the collapse column to perform grouting transformation; Step S106, detecting and analyzing the waterproof layer in the collapsed column, if the waterproof property of the waterproof layer does not meet the required standard, drilling horizontal branch holes from the main ground borehole to the waterproof layer, and grouting the waterproof layer for reinforcement; Step S107, conduct water conduction safety exploration and evaluation on the subsidence column. If the water conduction safety of the subsidence column meets the standard, then proceed with the mining work on the working face.

2. The method for separating and treating water-conducting subsidence columns according to claim 1, characterized in that: The isolation curtain is formed by enclosing a plurality of grouting boreholes, and the grout penetration ranges of two adjacent grouting boreholes have mutually overlapping parts.

3. The method for separating and treating water-conducting subsidence columns according to claim 2, characterized in that: A sealing pile is arranged between two adjacent grouting boreholes, and the sealing pile and the slurry penetration range of the two adjacent grouting boreholes have overlapping parts.

4. The method for separating and treating water-conducting subsidence columns according to claim 3, characterized in that: The sealing piles are bored cast-in-place piles or cement mixing piles.

5. The method for separating and treating water-conducting subsidence columns according to claim 1, characterized in that: In step S107, the water conduction safety of the collapsed column is evaluated by ground drilling in combination with transient electromagnetic method. If it is detected that there are parts in the collapsed column that do not meet the water conduction safety standards, additional grouting treatment is performed on the parts in the collapsed column that do not meet the standards.

6. The method for separating and treating water-conducting subsidence columns according to claim 5, characterized in that: A hole is drilled from the ground to the non-standard part of the collapsed column, and a grouting rod is inserted into the hole. The grouting rod reaches the non-standard part of the collapsed column to perform grouting operations.

7. The method for separating and treating water-conducting subsidence columns according to claim 6, characterized in that: The shallowest insertion depth of the grouting rod is located in the Taihui water layer, and the deepest insertion depth of the grouting rod is located in the Aohui water layer. The grouting rods are all located within the vertical projection range of the collapse column.

8. The method for separating and treating water-conducting subsidence columns according to any one of claims 1 to 7, characterized in that: In step S101, the plane and vertical ranges of the collapse column include the plane extension range of the collapse column and the underground extension depth of the collapse column.

9. The method for separating and treating water-conducting subsidence columns according to any one of claims 1 to 7, characterized in that: In step S102, the vertical development depth of the collapse column includes the vertical positional relationship between the collapse column and the Taihu grey water layer, the aquiclude and the Ordovician grey water layer.

10. The method for separating and treating water-conducting subsidence columns according to any one of claims 1 to 7, characterized in that: The outer periphery of the collapse column geometric shape is within a range of 30 to 50 meters from the isolation curtain.

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