Mine water conservation mining method

Abstract

The present invention provides a method for water-preserving mining in a mine. The method for water-preserving mining in a mine comprises: drilling a hole downward on the surface until a first through hole formed after drilling is connected to an aquifer below the surface; injecting a freezing liquid into the aquifer through the first through hole to freeze the aquifer, and detecting the freezing condition of the aquifer after a preset time period; when the freezing condition of the aquifer meets the preset requirements, mining is performed on the working face; wherein the freezing liquid is liquid nitrogen or liquid carbon dioxide. The present invention effectively solves the problem in the prior art that the treatment method for water in the aquifer affects the safety of mine mining.

Description

Technical Field

[0001] The invention relates to the technical field of mine mining, and in particular to a mine water conservation mining method. Background Art

[0002] At present, with the strategic transfer of my country's coal resources and the continuous improvement of mining technology, coal production presents a large-scale, high-intensity mining model. However, ignoring the protection of water resources can easily lead to a series of ecological and environmental deterioration problems such as soil erosion and land desertification, and ecological restoration after damage is often costly and difficult. Under the new normal of the development of the coal industry, "the coal production model must be transformed into safe, efficient, intelligent, and green mining." In the process of coal development, water resource carrying capacity must be one of the basic constraints, and effective water conservation measures must be taken during the mining process to ensure safe and efficient mining.

[0003] In the prior art, before mining in the underground working face of a coal mine, it is necessary to drain the water in the roof aquifer that affects the mining of coal resources, and the drained water is discharged to the ground through the underground drainage pipeline. However, the above drainage method has a weakening effect on the stability of the soil structure around the mine, affecting the safety of mine mining. Summary of the invention

[0004] The main purpose of the present invention is to provide a mine water conservation mining method to solve the problem in the prior art that the treatment method for water in the aquifer affects the safety of mine mining.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a mine water-preserving mining method, comprising: drilling a hole downward from the surface until a first through hole formed after the drilling is connected to an aquifer below the surface; injecting a refrigerant into the aquifer through the first through hole to freeze the aquifer, and detecting the freezing condition of the aquifer after a preset time period; when the freezing condition of the aquifer meets the preset requirements, mining the working face; wherein the refrigerant is liquid nitrogen or liquid carbon dioxide.

[0006] Furthermore, the method of constructing a drilling hole downward on the surface includes: drilling holes at intervals of a first preset distance S along the length direction and / or width direction of the surface; wherein the first preset distance S is greater than or equal to 40 m and less than or equal to 60 m.

[0007] Furthermore, the method of injecting the refrigerant into the aquifer through the first through hole includes: extending a pipe into the first through hole until the liquid outlet of the pipe is located between the top and bottom of the aquifer.

[0008] Furthermore, the method for detecting the freezing condition of the aquifer includes: drilling a hole along the circumference of the first through hole within a range of a second preset distance from the central axis of the first through hole until a second through hole formed after drilling is connected to the aquifer, and water in the aquifer is sucked through the second through hole to judge the freezing condition of the aquifer based on the amount of water sucked per unit time.

[0009] Furthermore, the method for judging the freezing condition of the aquifer based on the amount of water pumped per unit time includes: if the amount of water pumped per unit time is greater than or equal to the preset water amount, then it is judged that the aquifer does not meet the freezing requirements; if the amount of water pumped per unit time is less than the preset water amount, then it is judged that the aquifer meets the freezing requirements.

[0010] Furthermore, the method for detecting the freezing condition of the aquifer includes: before mining the working face, drilling a hole upward on the working face until a third through hole formed after drilling is connected to the aquifer; if water drips from the third through hole, it is determined that the aquifer does not meet the freezing requirements.

[0011] Furthermore, during the mining process of the working face, the mine water conservation mining method also includes: injecting freezing liquid into the goaf to ensure that ice blocks formed after the aquifer freezes and falls into the goaf will not melt.

[0012] Furthermore, before drilling downward on the surface, the mine water conservation and mining method also includes: obtaining hydrogeological information within the working face, the hydrogeological information including the spatial positions of aquifers and aquicludes; and determining the height position of the aquifer based on the obtained hydrogeological information.

[0013] Furthermore, before drilling downward on the surface, the mine water conservation mining method also includes: obtaining the distribution relationship between the mine mining area and the aquifer, and determining the distribution of the plurality of first through holes according to the distribution relationship between the two.

[0014] Furthermore, the method for determining the distribution of multiple first through holes based on the distribution relationship between the mining area and the aquifer includes: when the aquifer is distributed in a local area of ​​the mining area, that is, the width of the mining area exceeds the width of the surrounding aquifer, the multiple first through holes only need to be arranged at the boundary position of the aquifer; when the aquifer is distributed in the entire mining area, that is, the width of the mining area is smaller than the width of the surrounding aquifer, the multiple first through holes are arranged in a circular shape to surround and cover the entire mining area.

[0015] By applying the technical solution of the present invention, before mining the working face of a mine, a hole is drilled on the surface to form a first through hole, and a refrigerant is injected into the aquifer through the first through hole to freeze the aquifer, thereby eliminating the need to drain the water in the aquifer. This solves the problem in the prior art that the treatment method of the water in the aquifer affects the safety of mine mining, maintains the groundwater level in the surrounding area, effectively protects the ecological environment around the mine, and can ensure the progress of the recovery work without interfering with the normal production activities of the mine.

[0016] Thus, compared with the prior art of using underground drainage pipes to drain the water in the aquifer to the ground, the mine water conservation mining method in the present application does not need to drain the water in the aquifer, and thus will not affect the stability of the soil structure around the mine. At the same time, after the mine is mined, the frozen water forms a frozen wall or a frozen circle, so that the groundwater after mining can be quickly restored to its original level, protecting water resources and the surface ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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. In the drawings:

[0018] Figure 1 A cross-sectional view showing the application of the first embodiment of the mine water conservation mining method according to the present invention in a mine;

[0019] Figure 2 Shows Figure 1 Flow chart of the water conservation mining method in the mine.

[0020] The above drawings include the following reference numerals:

[0021] 10. Ground surface; 20. First through hole; 30. Aquifer; 40. Working face; 50. Aquiclude; 60. Pipeline. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0024] In the present invention, unless otherwise specified, the directional words used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0025] In order to solve the problem in the prior art that the treatment method of water in the aquifer affects the safety of mine mining, the present application provides a mine water conservation mining method.

[0026] Embodiment 1

[0027] like Figure 1 and Figure 2 As shown, the mine water conservation mining method includes:

[0028] Drilling a hole downward on the ground surface 10 until a first through hole 20 formed after drilling is connected to an aquifer 30 below the ground surface 10;

[0029] injecting a freezing liquid into the aquifer 30 through the first through hole 20 to freeze the aquifer 30, and detecting the freezing condition of the aquifer 30 after a preset time period;

[0030] When the freezing condition of the aquifer 30 meets the preset requirements, mining is carried out on the working face 40. The freezing liquid is liquid nitrogen or liquid carbon dioxide.

[0031] By applying the technical solution of this embodiment, before mining the working face 40 of the mine, a hole is drilled on the surface 10 to form a first through hole 20, and a refrigerant is injected into the aquifer 30 through the first through hole 20 to freeze the aquifer 30. There is no need to drain the water in the aquifer 30, which solves the problem in the prior art that the treatment method of the water in the aquifer affects the safety of mine mining, maintains the groundwater level in the surrounding area, effectively protects the ecological environment around the mine, and can also ensure the progress of the recovery work without interfering with the normal production activities of the mine.

[0032] Thus, compared with the prior art of using underground drainage pipes to drain the water in the aquifer to the ground, the mine water conservation mining method in this embodiment does not need to drain the water in the aquifer 30, and thus will not affect the stability of the soil structure around the mine. At the same time, after the mine is mined, the frozen water forms a frozen wall or a frozen circle, so that the groundwater after mining can be quickly restored to its original level, protecting water resources and the surface ecological environment.

[0033] In this embodiment, artificial refrigeration and freezing of the underground aquifer 30 near the boundary of the mine field will not only not interfere with the production activities of coal mining, transportation, etc. in the mine, but also effectively block the underground water body around the mine field from draining into the mine, maintain the underground water level in the surrounding area, and effectively protect the ecological environment around the mining area. At the same time, the implementation method of the mine water conservation mining method is reliable and practical, especially suitable for water conservation mining in the cold open-pit mining areas in the west, and can make full use of the local climatic conditions to reasonably reduce the energy consumption brought by the implementation of the present invention, which is economical and environmentally friendly.

[0034] Optionally, the method of constructing a borehole downward on the ground surface 10 includes:

[0035] Drilling is performed at intervals of a first preset distance S along the length direction and / or width direction of the ground surface 10 ; wherein the first preset distance S is greater than or equal to 40 m and less than or equal to 60 m.

[0036] In this way, the above arrangement ensures that the groundwater around the first through hole 20 freezes to form an ice wall, thereby preventing the water in the aquifer 30 from flowing into the working face 40 and affecting normal mining. At the same time, the above arrangement makes the setting position of the first through hole 20 more reasonable, and reduces the processing difficulty of the staff under the premise of ensuring that the aquifer 30 can be frozen.

[0037] In this embodiment, the first through holes 20 are arranged in a circular divergent pattern with the center of the mine as the origin and the distance from the mine to the boundary of the mining area as the radius. The arrangement range covers the aquifer distribution area in the mining area, and the arrangement depth is preferably 5 meters deep into the aquifer 50 below the bottom interface of the underground aquifer.

[0038] In this embodiment, the first preset distance S is 50m.

[0039] Optionally, the method of injecting the refrigerant into the aquifer 30 through the first through hole 20 includes:

[0040] The pipe 60 is extended into the first through hole 20 until the liquid outlet of the pipe 60 is located between the top and bottom of the aquifer 30 .

[0041] Specifically, after the drilling is completed, the refrigerant is introduced into the pipe 60 . The above arrangement ensures that the refrigerant discharged from the liquid outlet of the pipe 60 directly flows into the aquifer 30 , thereby improving the freezing efficiency of the water and achieving rapid freezing of the aquifer 30 .

[0042] In this embodiment, the method for detecting the freezing condition of the aquifer 30 includes:

[0043] A hole is drilled along the circumference of the first through hole 20 within a second preset distance from the central axis of the first through hole 20 until the second through hole formed after the drilling is connected to the aquifer 30, and the water in the aquifer 30 is sucked through the second through hole to judge the freezing condition of the aquifer 30 according to the amount of water sucked per unit time.

[0044] Specifically, in the process of injecting refrigerant into the aquifer 30, the water in the aquifer 30 is sucked through the second through hole at regular intervals to determine the freezing condition of the aquifer 30, thereby making it easier and simpler for staff to determine the freezing condition of the aquifer 30 and reducing the difficulty of obtaining the information.

[0045] In this embodiment, the method for determining the freezing condition of the aquifer 30 according to the amount of water pumped per unit time includes:

[0046] If the amount of water pumped per unit time is greater than or equal to the preset amount of water, it is determined that the aquifer 30 does not meet the freezing requirements;

[0047] If the amount of water pumped per unit time is less than the preset amount of water, it is determined that the aquifer 30 meets the freezing requirements.

[0048] In this embodiment, during the mining process of the working face 40, the mine water conservation mining method further includes:

[0049] A freezing liquid is injected into the goaf to ensure that ice blocks formed after the aquifer 30 is frozen and fall into the goaf without melting.

[0050] In this way, when the staff is mining the working face 40, as the coal seam roof collapses, the roof aquifer 30 enters the goaf through frozen ice, and refrigerant continues to be injected into the goaf to ensure that the ice in the goaf is not melted, while preventing the goaf from catching fire.

[0051] Optionally, before drilling downward on the ground surface 10, the mine water conservation mining method further includes:

[0052] Obtaining hydrogeological information within the working face 40, the hydrogeological information including the spatial positions of the aquifer 30 and the aquiclude;

[0053] The height position of the aquifer 30 is determined based on the acquired hydrogeological information.

[0054] Specifically, according to the specific hydrogeological information of the mine, the distribution of underground aquifers in the area is explored through drilling of hydrogeological information, and the underground aquifers within the mine field are intercepted by freezing circle by artificial refrigeration to prevent the groundwater outside the mining range of the mine field from being discharged into the open-pit mine. The freezing circle is formed by artificial refrigeration of the first through hole 20 and its matching pipeline for conveying refrigerant.

[0055] Embodiment 2

[0056] The difference between the mine water conservation mining method in the second embodiment and the first embodiment is that the method for detecting the freezing condition of the aquifer 30 is different.

[0057] Before mining the working face 40 , a hole is drilled upward on the working face 40 until a third through hole formed after drilling is connected to the aquifer 30 . If water drips from the third through hole, it is determined that the aquifer 30 does not meet the freezing requirements.

[0058] In this way, before mining the working face 40, a third through hole is drilled to form the freezing condition of the aquifer 30 by judging whether there is water dripping in the third through hole, so that the staff can judge the freezing condition of the aquifer 30 more easily and conveniently, and the difficulty of obtaining the freezing condition is reduced. At the same time, the above-mentioned setting makes the method of detecting the freezing condition of the aquifer 30 more diverse to meet different usage requirements and working conditions, and also improves the construction flexibility of the staff.

[0059] Embodiment 3

[0060] The mine water conservation mining method in the third embodiment is different from that in the first embodiment in that the method of constructing the downward drilling hole on the ground surface 10 is different.

[0061] In this embodiment, before drilling downward on the ground surface 10, the mine water conservation mining method further includes:

[0062] The distribution relationship between the mining area of ​​the mine and the aquifer 30 is obtained, and the distribution of the plurality of first through holes 20 is determined according to the distribution relationship between the two.

[0063] Specifically, before drilling downward on the surface 10, the drilling position is determined based on the distribution relationship between the mining area and the aquifer 30 to meet different working conditions, thereby improving the water conservation efficiency of the mine and further improving the safety of mine mining.

[0064] In this embodiment, the method for determining the distribution of the plurality of first through holes 20 according to the distribution relationship between the mining area of ​​the mine and the aquifer 30 includes:

[0065] When the aquifer 30 is distributed in a local area of ​​the mining area, that is, when the width of the mining area exceeds the width of the surrounding aquifer 30, the plurality of first through holes 20 only need to be arranged at the boundary position of the aquifer 30;

[0066] When the aquifer 30 is distributed throughout the entire mining area, that is, when the width of the mining area is smaller than the width of the surrounding aquifer 30 , the plurality of first through holes 20 are arranged in a circular shape to surround and cover the entire mining area.

[0067] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0068] Before mining the working face of a mine, a hole is drilled on the surface to form a first through hole, and a refrigerant is injected into the aquifer through the first through hole to freeze the aquifer. This eliminates the need to drain the water in the aquifer, thereby solving the problem in the prior art that the treatment method of water in the aquifer affects the safety of mine mining, maintains the groundwater level in the surrounding area, effectively protects the ecological environment around the mine, and ensures the progress of mining work without interfering with the normal production activities of the mine.

[0069] Thus, compared with the prior art of using underground drainage pipes to drain the water in the aquifer to the ground, the mine water conservation mining method in the present application does not need to drain the water in the aquifer, and thus will not affect the stability of the soil structure around the mine. At the same time, after the mine is mined, the frozen water forms a frozen wall or a frozen circle, so that the groundwater after mining can be quickly restored to its original level, protecting water resources and the surface ecological environment.

[0070] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0071] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0072] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A mine water conservation mining method, characterized in that: include: Drilling a hole downward on the ground surface (10) until a first through hole (20) formed after drilling is connected to an aquifer (30) below the ground surface (10); injecting a freezing liquid into the aquifer (30) through the first through hole (20) to freeze the aquifer (30), and detecting the freezing status of the aquifer (30) after a preset time period; When the freezing condition of the aquifer (30) meets preset requirements, mining is performed on the working face (40); Wherein, the freezing liquid is liquid nitrogen or liquid carbon dioxide; The method of constructing a borehole downwardly from the ground surface (10) comprises: Drilling holes at intervals of a first preset distance S along the length direction and / or width direction of the ground surface (10); During mining of the working face (40), the mine water conservation mining method further comprises: A freezing liquid is injected into the goaf to ensure that ice blocks formed after the aquifer (30) is frozen and fall into the goaf without melting.

2. The mine water conservation mining method according to claim 1, characterized in that: The first preset distance S is greater than or equal to 40 m and less than or equal to 60 m.

3. The mine water conservation mining method according to claim 1, characterized in that: The method of injecting a refrigerant into the water-containing layer (30) through the first through hole (20) comprises: The pipe (60) is extended into the first through hole (20) until the liquid outlet of the pipe (60) is located between the top and bottom of the aquifer (30).

4. The mine water conservation mining method according to claim 1, characterized in that: The method for detecting the freezing condition of the aquifer (30) comprises: A hole is drilled along the circumference of the first through hole (20) within a range of a second preset distance from the central axis of the first through hole (20) until a second through hole formed after the drilling is connected to the aquifer (30), and water in the aquifer (30) is sucked through the second through hole to judge the freezing condition of the aquifer (30) based on the amount of water sucked per unit time.

5. The mine water conservation mining method according to claim 4, characterized in that: The method for judging the freezing condition of the aquifer (30) according to the amount of water pumped per unit time comprises: If the amount of water pumped per unit time is greater than or equal to a preset amount of water, it is determined that the aquifer (30) does not meet the freezing requirements; If the amount of water pumped per unit time is less than the preset amount of water, it is determined that the aquifer (30) meets the freezing requirements.

6. The mine water conservation mining method according to claim 1, characterized in that: The method for detecting the freezing condition of the aquifer (30) comprises: Before mining the working face (40), a hole is drilled upward on the working face (40) until a third through hole formed after drilling is connected to the aquifer (30); if water drips from the third through hole, it is determined that the aquifer (30) does not meet the freezing requirements.

7. The mine water conservation mining method according to claim 1, characterized in that: Before drilling a hole downward on the ground surface (10), the mine water conservation mining method further comprises: Acquiring hydrogeological information within the working face (40), wherein the hydrogeological information includes the spatial positions of the aquifer (30) and the aquiclude (50); The height position of the aquifer (30) is determined based on the acquired hydrogeological information.

8. The mine water conservation mining method according to claim 1, characterized in that: Before drilling a hole downward on the ground surface (10), the mine water conservation mining method further comprises: The distribution relationship between the mining area of ​​the mine and the aquifer (30) is obtained, and the distribution of the plurality of first through holes (20) is determined according to the distribution relationship between the two.

9. The mine water conservation mining method according to claim 8, characterized in that: The method for determining the distribution of a plurality of first through holes (20) according to the distribution relationship between the mining area of ​​the mine and the aquifer (30) comprises: When the width of the mining area of ​​the mine exceeds the width of the surrounding aquifer (30), the plurality of first through holes (20) are arranged only at the boundary position of the aquifer (30); When the width of the mining area is smaller than the width of the surrounding aquifer (30), the plurality of first through holes (20) are arranged in a circular pattern to surround and cover the entire mining area.

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