A method for treating mine water

Abstract

The present invention provides a method for treating mine water, the method comprising: drilling a water injection hole through the tunnel and reaching the water storage target layer underground at a preset position on the ground above the tunnel, setting a casing in the water injection hole while drilling the water injection hole; setting a water stopper at a position lower than the bottom of the tunnel in the casing; setting a through hole on the side wall of the casing at the tunnel, and setting a control device for controlling the opening and closing of the through hole at the through hole, and setting a pressurizing device at the input end of the control device; taking out the water stopper, blocking the orifice of the water injection hole, starting the pressurizing device, and outputting the mine water in the tunnel to the casing in the water injection hole through the pressurizing device and the control device. The application of the present invention can reduce the process of mine water treatment and reduce the treatment cost.

Description

Technical Field

[0001] The present application relates to the field of mining engineering technology, and in particular to a method for treating mine water. Background Art

[0002] Mine water refers to the water that seeps into the tunnels from the aquifer or surface runoff during underground mining. In order to ensure safe production and prevent mine water hazards, treatment measures must be taken for mine water. In the existing technology, since many places have introduced requirements for zero discharge of mine water, the traditional treatment process of mine water is mainly based on centralized treatment in large-scale sewage treatment plants on the ground, so that it can meet the reuse water quality requirements and then be recycled. However, using large-scale sewage treatment plants to treat mine water has the disadvantages of large infrastructure investment, high mine water lifting and operating costs, large land area, and secondary pollution.

[0003] In view of this, a research team has proposed a deep mine water storage technology. Based on a thorough study of hydrogeological conditions, safety, and environmental impacts, the mine water is first lifted from underground to the surface, and then drilled on the ground to inject the mine water into the deep underground storage target layer to achieve the transfer and storage of mine water. However, the existing technology of first lifting the mine water from underground to the surface and then injecting it underground is complex and costly.

[0004] In summary, since the methods for treating mine water in the prior art have the disadvantages as described above, how to propose a better method for treating mine water, thereby reducing the mine water treatment process and reducing the treatment cost, is a problem that urgently needs to be solved in this field. Summary of the invention

[0005] In view of this, the present invention provides a method for treating mine water, thereby reducing the procedures for treating mine water and lowering the treatment cost.

[0006] The technical solution of the present invention is specifically achieved as follows:

[0007] A method for treating mine water, the method comprising:

[0008] Step A, at a preset position on the ground above the tunnel, drilling a water injection hole underground that passes through the tunnel and reaches the water storage target layer, and setting a casing in the water injection hole while drilling the water injection hole;

[0009] Step B, setting a water stopper in the casing at a position lower than the bottom of the tunnel;

[0010] Step C, providing a through hole on the side wall of the casing at the tunnel, providing a control device for controlling the opening and closing of the through hole at the through hole, and providing a pressurizing device at the input end of the control device;

[0011] Step D, take out the water stop plug, seal the opening of the water injection hole, start the pressurizing device, and output the mine water in the tunnel to the casing in the water injection hole through the pressurizing device and the control device.

[0012] Preferably, the water stopper is placed in the middle of the first section of casing below the tunnel through the drill rod, avoiding the coupling at the joint of the two sections of casing, and the water stopper is stretched open.

[0013] Preferably, after a water stopper is installed in the casing, a pressure test is performed in the casing.

[0014] Preferably, the step C further comprises the following steps:

[0015] Step C1, drilling a through hole of a first diameter on the casing wall at the tunnel, for releasing the water column at the upper part of the through hole of the first diameter in the casing into the tunnel;

[0016] Step C2, drilling a through hole with a second aperture at the location of the through hole with the first aperture, wherein the second aperture is larger than the first aperture;

[0017] Step C3, installing a control device on the through hole of the second aperture.

[0018] Preferably, the first aperture is φ10 mm, and the second aperture is φ100 mm.

[0019] Preferably, the control device is a high pressure valve or a one-way valve.

[0020] Preferably, cement is used to seal the opening of the water injection hole.

[0021] Preferably, the pressurizing device is a water injection pump.

[0022] Preferably, the target water storage layer is an underground aquifer.

[0023] As can be seen above, in the method for treating mine water of the present invention, by rationally designing the steps for treating mine water, there is no need to lift the mine water to the surface, and the mine water in the tunnel can be directly injected into the storage target layer, thereby reducing the mine water treatment process and lowering the treatment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a flow chart of a method for treating mine water in an embodiment of the present invention.

[0025] Figure 2 It is a schematic structural diagram of the water injection hole in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] Figure 1 The figure is a flow chart of a method for treating mine water in an embodiment of the present invention.

[0028] like Figure 1 As shown, the method for treating mine water in the embodiment of the present invention comprises the following steps:

[0029] Step 101, at a preset position on the ground above the tunnel, a water injection hole is drilled underground, passing through the tunnel and reaching the water storage target layer, and a casing is set in the water injection hole while drilling the water injection hole;

[0030] Step 102, setting a water stopper at a position in the casing below the bottom of the tunnel;

[0031] Step 103, a through hole is provided on the side wall of the casing at the tunnel, a control device for controlling the opening and closing of the through hole is provided at the through hole, and a pressurizing device is provided at the input end of the control device;

[0032] Step 104, take out the water stop plug, seal the opening of the water injection hole, start the pressurizing device, and output the mine water in the tunnel to the casing in the water injection hole through the pressurizing device and the control device.

[0033] In the technical solution of the present invention, a variety of implementation methods can be used to implement the above-mentioned method for treating mine water. The technical solution of the present invention will be described in detail below by taking one of the implementation methods as an example.

[0034] For example, preferably, in a specific embodiment of the present invention, the water storage target layer may be an underground aquifer.

[0035] A tunnel is a roughly horizontal tunnel dug underground during mining, generally used for transportation, drainage or ventilation. During the mining process, mine water slowly seeps out from the strata or coal wall cracks on the tunnel and accumulates in the tunnel. The mine water in the tunnel is pressure-free, but it still affects mining and the environment. Therefore, it is necessary to treat the mine water accumulated in the tunnel.

[0036] At a preset position on the ground above the tunnel, a water injection hole is drilled underground, and a casing is set in the water injection hole at the same time. Drilling and lowering the casing can not only make the water injection hole more secure, but also when the water injection hole is connected with the tunnel, the casing is lowered into the water injection hole at the same time, so that the casing seals the tunnel, preventing groundwater from gushing up from the water injection hole and pouring into the tunnel when the grouting hole is drilled into the underground aquifer.

[0037] For example, assuming that the tunnel is 500 meters underground, a water injection hole is drilled from the ground downwards, and casing is lowered while drilling. The drilled water injection holes are all provided with casing. When the water injection hole reaches the underground aquifer (for example, 2000 meters underground), due to the presence of groundwater in the underground aquifer, under the action of pressure, groundwater will flow from the underground aquifer into the casing of the water injection hole, forming a water column in the casing. For example, the water surface of the groundwater flowing into the casing may be 100 meters underground, at which time the water surface height in the casing is higher than the height of the tunnel. Since the casing has been lowered at the same time when the water injection hole is drilled, the groundwater will form a water column in the casing and will not flow into the tunnel.

[0038] For another example, preferably, in a specific embodiment of the present invention, the water stop plug can be placed in the middle position of the first section of casing below the tunnel through the drill rod, avoiding the coupling at the butt joint of the two sections of casing, and the water stop plug is stretched open to make it in close contact with the inner wall of the casing to seal the groundwater.

[0039] The water stop plug is fixed to one end of the drill rod, and the water stop plug is passed through the water column in the casing through the drill rod, and placed in the middle of the first section of casing below the tunnel. Since multiple sections of casing are connected by couplings in the water injection hole, in order to avoid the casing connection from affecting the water stop plug's blocking of groundwater, the water stop plug is set in the middle of the first section of casing below the tunnel, so as to better ensure that the water stop plug is tightly connected to the inner wall of the casing. After the water stop plug is opened, the water stop plug is in close contact with the casing to achieve a sealed state, preventing the groundwater from continuing to surge up and pouring into the tunnel when the casing at the tunnel is opened later.

[0040] In addition, as an example, in a preferred specific embodiment of the present invention, after a water stopper is arranged in the casing, a pressure test is performed in the casing to detect whether the connection between the water stopper and the casing is airtight.

[0041] The pressure value is set according to the data obtained from the pressure test. The pressure stabilization time of the monitoring pressure value in the casing is not less than 30 minutes. It is observed that the water level in the casing does not change and the water stop plug does not move. It is ensured that there will be no leakage from the placement to the removal of the water stop plug, so as to avoid groundwater entering the casing when the casing in the tunnel is opened later, and then flowing into the tunnel.

[0042] In addition, as an example, in a preferred specific embodiment of the present invention, the step 103 may further include the following steps:

[0043] Step 31, drilling a through hole of a first diameter on the casing wall at the tunnel, for releasing the water column at the upper part of the through hole of the first diameter in the casing into the tunnel;

[0044] Step 32, drilling a through hole with a second aperture at the location of the through hole with the first aperture, wherein the second aperture is larger than the first aperture;

[0045] Step 33, installing a control device on the through hole of the second aperture.

[0046] Since there is a water column with groundwater gushing out on the upper part of the water stopper in the casing, in order to connect the tunnel and the casing, a small hole, i.e. a through hole of a first aperture, is firstly drilled on the casing to release the water pressure of the water column so that the water of the water column can slowly flow into the tunnel to prevent the water in the water column from quickly pouring into the tunnel under the action of water pressure due to the large aperture, causing excessive impact on the tunnel. After releasing the water pressure of the water column, a large hole, i.e. a through hole of a second aperture, is drilled to facilitate the injection of mine water in the tunnel and the water released by the water column into the underground aquifer through the casing in the injection hole at a later time.

[0047] Preferably, in a specific embodiment of the present invention, the first aperture may be φ10 mm, and the second aperture may be φ100 mm.

[0048] In addition, as an example, in a specific embodiment of the present invention, the control device may be a high pressure valve or a one-way valve or other control device that can control the unidirectional flow of water.

[0049] After installing the control device on the through hole of the second aperture, the opening and closing of the through hole of the second aperture can be controlled by the control device. When the control device is opened, the casing can be connected to the tunnel through the through hole of the second aperture and the control device; when the control device is closed, the passage between the casing and the tunnel is closed, thereby preventing groundwater from flowing into the tunnel through the through hole of the second aperture after the water stop plug is removed.

[0050] When the control device is a high-pressure valve, the valve will only open when the water pressure reaches the pressure setting value of the high-pressure valve. When the pressure setting value of the high-pressure valve is higher than the pressure of the groundwater, the pressure of the groundwater will not open the high-pressure valve after the water stop plug is removed, so the groundwater will not flow into the tunnel.

[0051] In addition, as an example, in a preferred specific embodiment of the present invention, cement can be used to seal the opening of the water injection hole.

[0052] In addition, as an example, in a preferred specific embodiment of the present invention, the pressurizing device may be a water injection pump.

[0053] After installing the high-pressure valve and water injection pump, remove the water stopper and use cement to seal the orifice of the water injection hole, thereby preventing groundwater or mine water from gushing out of the orifice of the water injection hole. Then, the mine water in the tunnel is pressurized by the water injection pump to make its pressure value higher than the pressure specified value of the high-pressure valve, so that the high-pressure valve can be opened. The pressure of the mine water in the tunnel pressurized by the water injection pump is higher than the pressure of the groundwater in the casing. Therefore, during the continuous pressurization and pumping process of the water injection pump, the mine water in the tunnel is injected into the underground aquifer, and the groundwater is also pressed into the underground aquifer under the pressure of the grouting pump without upwelling. In this way, the mine water in the tunnel is injected into the underground water storage target layer.

[0054] To sum up, in the technical solution of the present invention, due to the reasonable design of the steps for treating mine water, there is no need to lift the mine water to the surface, and the mine water in the tunnel can be directly injected into the storage target layer, which reduces the mine water treatment process and reduces the treatment cost.

[0055] 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 should be included in the scope of protection of the present invention.

Claims

1. A method for treating mine water, characterized in that: The method includes: Step A, at a preset position on the ground above the tunnel, drilling a water injection hole underground that passes through the tunnel and reaches the water storage target layer, and setting a casing in the water injection hole while drilling the water injection hole; Step B, setting a water stopper at a position in the casing below the bottom of the tunnel; Step C, providing a through hole on the side wall of the casing at the tunnel, providing a control device for controlling the opening and closing of the through hole at the through hole, and providing a pressurizing device at the input end of the control device; Step D, take out the water stop plug, seal the opening of the water injection hole, start the pressurizing device, and output the mine water in the tunnel to the casing in the water injection hole through the pressurizing device and the control device.

2. The method according to claim 1, characterized in that: The water stopper is placed at the middle position of the first section of casing below the tunnel through the drill rod, avoiding the coupling at the joint of the two sections of casing, and the water stopper is opened.

3. The method according to claim 1, characterized in that: After installing the water stopper in the casing, a pressure test is carried out in the casing.

4. The method according to claim 1, characterized in that: The step C further comprises the following steps: Step C1, drilling a through hole of a first diameter on the casing wall at the tunnel, so as to release the water column at the upper part of the through hole of the first diameter in the casing into the tunnel; Step C2, drilling a through hole with a second aperture at the location of the through hole with the first aperture, wherein the second aperture is larger than the first aperture; Step C3, installing a control device on the through hole of the second aperture.

5. The method according to claim 4, characterized in that: The first aperture is φ10 mm, and the second aperture is φ100 mm.

6. The method according to claim 1, characterized in that: The control device is a high pressure valve or a one-way valve.

7. The method according to claim 1, characterized in that: Use cement to seal the opening of the water injection hole.

8. The method according to claim 1, characterized in that: The pressurizing device is a water injection pump.

9. The method according to claim 1, characterized in that: The water storage target layer is an underground aquifer.

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