A quick plugging method for tailings leakage of tailings pond drainage well arch plate

Abstract

The application discloses a kind of tailing pond drainage well arch plate leakage tailings rapid plugging method, including S1, preliminary filling: with the center of drainage well arch plate leakage point, utilize stone to carry out preliminary filling to collapse area;S2, grouting hole boundary determination: in the periphery side of collapse area, along with the direction of 65°-70° with horizontal line is inclined to the direction of drainage well arch plate leakage point drilling, form grouting hole, grouting to grouting hole until not leak, form grouting hole boundary;S3, layered grouting: in collapse area determine drainage well center point, in grouting hole boundary and the periphery side of drainage well, utilize casing drilling operation, install pressure air pipeline and grouting pipeline in casing to the bottom of drainage well base, by pressure air method in casing grouting to required position, successively upwardly lift pressure air pipeline and grouting pipeline, to realize layer by layer advancing, upward layered grouting.The advantage is: effectively reduce the leakage of tailings, improve the overall structure safety of collapse area, promote flood drainage system operation safety.

Description

Technical Field

[0001] The invention relates to the technical field of tailings pond construction, in particular to a method for quickly blocking tailings leakage from an arch plate of a drainage well of a tailings pond. Background Art

[0002] When the arch plate structure strength of the tailings pond drainage well is damaged and tailings leakage occurs, the pressure of the leaked tailings slurry is high due to the high pressure of the overlying tailings. Personnel are unable to enter the drainage culvert at the bottom of the drainage well in time to seal it. Only the filling and sealing of anti-filtration materials such as earth and stone are carried out in the collapsed area of ​​the beach surface in the reservoir, resulting in a long tailings leakage time and difficulty in reinforcing the leakage site, affecting the normal operation of the tailings pond and the implementation of the subsequent dam body raising operation. Summary of the Invention

[0003] The object of the present invention is to provide a method for quickly sealing tailings leakage from an arch plate of a tailings pond drainage well, thereby solving the above-mentioned problems existing in the prior art.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] A method for quickly sealing tailings leakage from an arch plate of a tailings pond drainage well comprises the following steps:

[0006] S1. Preliminary filling: The collapsed area centered on the leakage point of the drainage well arch plate is preliminarily filled with stones;

[0007] S2. Determine the grouting hole boundary: Drill holes at an angle of 65°-70° to the horizontal line toward the leakage point of the drainage well arch plate on the outer periphery of the collapse area to form grouting holes. Grout is injected into the grouting holes until no leakage occurs, thus forming the grouting hole boundary.

[0008] S3. Layered grouting: Determine the center point of the drainage well in the collapse area, use casing to drill holes within the boundary of the grouting hole and on the outer side of the drainage well, install compressed air pipes and grouting pipes in the casing to the bottom of the drainage well base, use the compressed air slurrying method in the casing to grout the required positions, and gradually lift the compressed air pipes and grouting pipes upward to achieve layer-by-layer advancement and upward layered grouting.

[0009] Preferably, step S1 is specifically as follows: after a period of time after the leakage occurs, a collapse area centered on the leakage point of the drainage well will be formed on the beach surface in the reservoir, and several floating boats will be arranged in the collapse area according to its area. In the initial stage, the collapse area is filled with soil and stone or blocks wrapped with geotextiles to increase the bearing capacity of the beach surface and facilitate the arrangement of drilling equipment.

[0010] Preferably, the lower end of the grouting hole boundary extends to the drainage culvert connected to the lower side of the drainage well, and the leakage point of the drainage well arch plate is located within the grouting hole boundary.

[0011] Preferably, step S3 is specifically as follows: after determining the center point of the drainage well in the collapse area, a down-the-hole drill is added, and a fixed casing is drilled within the grouting boundary and the outer periphery of the drainage well. After forming a preliminary borehole, a compressed air pipe and a grouting pipe are installed in the casing to the bottom of the drainage well base; grouting is performed at the desired position by the compressed air slurrying method in the pipe; and each grouting is 4 to 5 m 3 , raise the grouting pipe and the compressed air pipe upward by 0.1 to 0.2 m and stay for 10 to 15 minutes. After the grouting liquid solidifies, insert the grouting pipe and the compressed air pipe into the hard bottom and continue grouting, advancing layer by layer and grouting upward in layers.

[0012] Preferably, after grouting is completed, the grouting solidification zone and the boundary of the grouting hole form a conical structure that is wide at the top and narrow at the bottom, the lower end of the conical structure contacts the outer wall of the drainage culvert connected to the lower side of the drainage well, and the upper end of the conical structure is flush with the upper surface of the tailings.

[0013] Preferably, after step S3, the method further includes:

[0014] S4. Secondary grouting: Change the position of the casing and re-drill to the bottom of the drainage well base. Use a steel pipe to insert the upper end of the hole for secondary grouting to seal the gaps that exist after the layered grouting.

[0015] Preferably, step S4 specifically includes changing the position of the fixed casing, re-drilling a hole to the bottom of the drainage well base, wrapping hemp wire around a steel pipe with the same diameter as the hole, inserting the upper end into the hole, and performing secondary grouting after reinforcement to fill the gaps existing in the layered grouting.

[0016] Preferably, the grouting is completed when the secondary grouting reaches a pressure of 10 MPa as measured by a pressure gauge.

[0017] Preferably, the grouting liquid used for grouting is prepared from water glass and cement in a ratio of 1:1.

[0018] The beneficial effects of the present invention are: 1. The method of the present invention can make full use of the convenient construction conditions of drilling holes on the tailings beach surface and utilize multiple grouting fillings for sealing. At the same time, the implementation of this process can quickly consolidate the collapsed area of ​​the beach surface above the drainage well in the reservoir, and under the condensation support of the grouting filling material, the tailings around the leakage point form a cone with a certain strength, avoiding further leakage of the tailings and promoting the safe operation of the tailings pond. 2. The method of the present invention is convenient to construct, with less construction machinery and equipment and personnel, simple management, and obvious sealing efficiency and effect. It effectively avoids the abandonment and use of the flood drainage system, reduces the engineering investment in the construction of a new flood drainage system, and significantly improves the safety and economic benefits of the tailings pond of the mining enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a flow chart of a blocking method according to an embodiment of the present invention;

[0020] Figure 2 is the plan view of the tailings after plugging in the embodiment of the present application;

[0021] Figure 3 is the sectional view of the tailings after plugging in the embodiment of the present application.

[0022] In the figure: 1, drainage well arch plate leakage point; 2, grouting consolidation area; 3, drainage culvert; 4, tailings; 5, grouting hole boundary. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application is further described in detail below in combination with the drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0024] With the continuous operation of the tailings pond, the dam body gradually rises, the pressure of the tailings in the dam increases, and due to the influence of the use of the drainage well arch plate material and the construction process, part of the drainage well arch plate is prone to structural damage, which leads to the hidden danger of mine leakage. Once the arch plate leaks, it is not easy to quickly plug, which causes a large amount of loss and pollution of the downstream environment, and has a serious impact on the later operation of the tailings pond, which forces the enterprise to invest a large amount of funds in additional new drainage system engineering, causing waste of funds. In the embodiment, when the tailings pond drainage well arch plate leaks and cannot be effectively and quickly plugged and reinforced, a plugging method is provided, which forms a conical reinforced body by layer-by-layer grouting from bottom to top.

[0025] Under normal circumstances, the direct result of the structural damage of the tailings pond drainage well arch plate is the leakage of tailings. Since the bottom tailings are fine-grained tailings of a certain concentration, the leakage point is not easy to plug, thereby affecting the normal heightening operation and use of the tailings pond.

[0026] A certain period of time after the leakage, a collapse area centered on the drainage well leakage point will be formed on the beach surface in the pond. The grouting plugging scheme first arranges several floating boats in the collapse area according to the area, fills the collapse area with earth and stone materials or blocks of stone wrapped with geotextile in the initial stage, so as to improve the bearing capacity of the beach surface and facilitate the arrangement of drilling equipment.

[0027] On the periphery of the beach collapse area, drill at an angle of 65°-70° to the horizontal towards the leakage point direction, then grout, and grout until there is no leakage. Accurately measure the angle and length when drilling to ensure that the grouting position is on the upper part of the pond bottom to prevent the damage of the laid anti-seepage membrane.

[0028] After the center point of the drainage well is determined in the beach collapse area, a down-the-hole drill is added to fix the casing for drilling. After the initial drilling is completed, a compressed air pipe and a grouting pipe are installed in the casing to the bottom of the drainage well base. Grouting is performed at the required position using the compressed air slurry method in the pipe. The grouting liquid uses a ratio of 1:1 between water glass and cement. Each grouting is about 5m 3 , raise the grouting pipe and air duct upward by 0.2m and leave it for 10-15 minutes. After it solidifies, insert the grouting pipe and air duct into the hard bottom and continue grouting. Advance layer by layer and grout upward layer by layer.

[0029] After the first grouting (layered grouting) is completed, the casing is repositioned and re-drilled to the bottom. Hemp yarn is wrapped around a steel pipe of the same diameter as the hole and inserted into the upper end of the hole. After reinforcement, a second grouting is performed to fill any gaps left by the first grouting. When the second grouting reaches a pressure of 10 MPa, as measured by a pressure gauge, the structural strength and integrity of the entire grouting body are achieved.

[0030] See attached Figure 2 and 3 By adopting the above-mentioned plugging process, directional drilling and grouting are carried out from the top of the collapse area to the leakage point 1 of the drainage well arch plate, so that the grouting solidification zone 2 formed between the entire collapse area and the drainage culvert 3 connected to the bottom of the drainage well and the grouting hole boundary 5 constitute a structure with a certain strength. After the grouting liquid is filled with water glass and cement mixed in proportion, it quickly solidifies to form a conical structure with a certain strength. The tailings at the bottom of the collapse area form a unified whole, effectively preventing further leakage of the tailings 4, and creating safe implementation conditions for the emergency repair of the bottom facilities of the drainage well. The implementation of the drainage method of the present invention effectively reduces the leakage of tailings, improves the overall structural safety of the collapse area, promotes the safe operation of the flood discharge system, and provides a convenient and reliable new method for sealing leakage of the drainage well arch plate of the tailings pond of mining enterprises.

[0031] By adopting the above technical solution disclosed in the present invention, the following beneficial effects are obtained:

[0032] The present invention discloses a method for quickly plugging tailings leakage from the arch plate of a tailings pond drainage well. The method of the present invention can make full use of the convenient construction conditions of drilling holes on the tailings beach surface and utilize multiple grouting fillings for plugging. At the same time, the implementation of this process can quickly consolidate the collapsed area of ​​the beach surface above the drainage well in the reservoir, and under the condensation support of the grouting filling material, the tailings around the leakage point form a cone with a certain strength, thereby avoiding further leakage of the tailings and promoting the safe operation of the tailings pond. The method of the present invention is convenient to construct, requires less construction machinery and equipment and personnel, is simple to manage, has obvious plugging efficiency and effect, effectively avoids the abandonment and use of the flood drainage system, reduces the engineering investment in the construction of a new flood drainage system, and significantly improves the safety and economic benefits of the tailings pond of the mining enterprise.

[0033] The above merely describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, several improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as falling within the protection scope of the present application.

Claims

1. A method for quickly sealing tailings leakage from the arch plate of a tailings pond drainage well, characterized by: The following steps are included: S1. Preliminary filling: The collapsed area centered on the leakage point of the drainage well arch plate is preliminarily filled with stones; Specifically, step S1 includes: a period of time after the leakage occurs, a subsidence area will form on the beach surface of the reservoir, centered at the leakage point of the drainage well. Several floating boats are arranged in the subsidence area according to its area. Initially, the subsidence area is filled with soil and stone or rocks wrapped with geotextiles to increase the bearing capacity of the beach surface and facilitate the arrangement of drilling equipment. S2. Determine the grouting hole boundary: Drill holes at an angle of 65°-70° to the horizontal line toward the leakage point of the drainage well arch plate on the outer periphery of the collapse area to form grouting holes. Grout is injected into the grouting holes until no leakage occurs, thus forming the grouting hole boundary. S3. Layered Grouting: Determine the center point of the drainage well in the collapsed area. Use casing to drill holes within the grouting hole boundary and on the outer periphery of the drainage well. Install compressed air pipes and grouting pipes in the casing to the bottom of the drainage well base. Use the compressed air grouting method in the casing to grout the required locations. Gravel the compressed air pipes and grouting pipes upwards step by step to achieve layer-by-layer grouting. Step S3 specifically includes: after determining the center point of the drainage well in the collapse area, adding a down-the-hole drill, fixing the casing to drill holes within the grouting boundary and the outer periphery of the drainage well, forming a preliminary hole, installing a compressed air pipe and a grouting pipe in the casing to the bottom of the drainage well base; grouting the required position by the compressed air slurrying method in the pipe; every grouting of 4~5m 3 , raise the grouting pipe and the compressed air pipe upward by 0.1~0.2m and stay for 10~15 minutes. After the grouting liquid solidifies, insert the grouting pipe and the compressed air pipe into the hard bottom and continue grouting, advancing layer by layer and grouting upwards.

2. The method for rapidly sealing tailings leakage from the arch plate of a tailings pond drainage well according to claim 1, characterized in that: The lower end of the grouting hole boundary extends to the drainage culvert connected to the lower side of the drainage well, and the leakage point of the drainage well arch plate is located within the grouting hole boundary.

3. The method for rapidly sealing tailings leakage from the arch plate of a tailings pond drainage well according to claim 1, characterized in that: After grouting is completed, the grouting solidification zone and the boundary of the grouting hole form a conical structure that is wide at the top and narrow at the bottom. The lower end of the conical structure contacts the outer wall of the drainage culvert connected to the lower side of the drainage well, and the upper end of the conical structure is flush with the upper surface of the tailings.

4. The method for rapidly sealing tailings leakage from the arch plate of a tailings pond drainage well according to claim 1, characterized in that: After step S3, the method further includes: S4. Secondary grouting: Change the position of the casing and re-drill to the bottom of the drainage well base. Use a steel pipe to insert the upper end of the hole for secondary grouting to seal the gaps that exist after the layered grouting.

5. The method for rapidly plugging tailings leakage from the arch plate of a tailings pond drainage well according to claim 4, characterized in that: Step S4 specifically involves changing the position of the fixed casing, re-drilling a hole to the bottom of the drainage well base, wrapping hemp wire around a steel pipe with the same aperture, inserting the upper end into the hole, and performing secondary grouting after reinforcement to fill the gaps existing in the layered grouting.

6. The method for rapidly sealing tailings leakage from the arch plate of a tailings pond drainage well according to claim 5, characterized in that: When the secondary grouting reaches a pressure of 10 MPa as measured by the pressure gauge, the grouting is completed.

7. The method for rapidly plugging tailings leakage from the arch plate of a tailings pond drainage well according to any one of claims 1 to 6, characterized in that: The grouting liquid used for grouting is prepared from water glass and cement in a ratio of 1:1.

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