Rapid plugging method for leaked tailings of tailing pond drainage well arch slab

Abstract

The invention discloses a quick plugging method for leaked tailings of a drainage well arch slab of a tailing pond, which comprises the following steps: S1, primary filling: primarily filling a subsidence area with a leakage point of the drainage well arch slab as a center by using stones; s2, determining the boundary of a grouting hole: obliquely drilling in the direction of the leakage point of the drainage well arch slab along the direction forming an angle of 65-70 degrees with the horizontal line on the peripheral side of the subsidence area to form the grouting hole, and grouting the grouting hole until no leakage occurs to form the boundary of the grouting hole; s3, layered grouting: determining a central point of a drainage well in the subsidence area, performing drilling operation in the boundary of a grouting hole and on the peripheral side of the drainage well by using a sleeve, mounting a compressed air pipeline and a grouting pipeline in the sleeve to the bottom of a drainage well base, grouting a required position through a compressed air slurry making method in the sleeve, gradually lifting the compressed air pipeline and the grouting pipeline upwards, and performing layered grouting; therefore, layer-by-layer propulsion and upward layered grouting are realized. The method has the advantages that the leakage rate of tailings is effectively reduced, the overall structural safety of the subsidence area is improved, and the operation safety of a flood drainage system is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of tailings pond construction, and particularly relates to a rapid plugging method for tailings leakage from the arch plate of a drainage well in a tailings pond. Background Art

[0002] When the arch plate structure strength of the drainage well in the tailings pond is damaged and tailings leakage occurs, due to the large pressure of the overlying tailings, the pressure of the leaking tailings slurry is relatively high, and personnel cannot enter the bottom flood discharge culvert of the drainage well in time for plugging. Only the filling and plugging of filter materials such as earth and stone materials are carried out in the collapsed area on the beach surface of the pond, resulting in a long tailings leakage time and difficult reinforcement treatment of the leakage site, affecting the normal operation of the tailings pond and the implementation of the subsequent dam body elevation operation. Summary of the Invention

[0003] The purpose of the present invention is to provide a rapid plugging method for tailings leakage from the arch plate of a drainage well in a tailings pond, so as to solve the foregoing problems existing in the prior art.

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

[0005] A rapid plugging method for tailings leakage from the arch plate of a drainage well in a tailings pond includes the following steps:

[0006] S1. Preliminary filling: For the collapsed area centered on the leakage point of the arch plate of the drainage well, use stone materials for preliminary filling;

[0007] S2. Determination of the boundary of the grouting holes: On the outer peripheral side of the collapsed area, drill holes obliquely in the direction of the leakage point of the arch plate of the drainage well along a direction at an angle of 65° - 70° with the horizontal line to form grouting holes, and grout into the grouting holes until there is no leakage, forming the boundary of the grouting holes;

[0008] S3. Layered grouting: Determine the center point of the drainage well in the collapsed area. Inside the boundary of the grouting holes and on the outer peripheral side of the drainage well, use a casing to drill holes, install a compressed air pipeline and a grouting pipeline in the casing to the bottom of the drainage well foundation, and grout the required positions by the method of making slurry with compressed air inside the casing, and gradually lift the compressed air pipeline and the grouting pipeline upward to achieve layer-by-layer advancement and upward layered grouting.

[0009] Preferably, step S1 is specifically as follows: After tailings leakage occurs for a period of time, a collapsed area centered on the leakage point of the drainage well will be formed on the beach surface of the pond. According to the area of the collapsed area, arrange several floating boats, and initially fill the collapsed area with earth and stone materials or boulders wrapped with geotextiles to improve the bearing capacity of the beach surface for the layout of drilling equipment.

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

[0011] Preferably, step S3 is specifically as follows: After determining the center point of the drainage well in the subsidence area, a down-the-hole drill is added, and casing drilling operations are carried out within the grouting boundary and on the outer peripheral side of the drainage well to form a preliminary drill hole. Then, a compressed air pipeline and a grouting pipeline are installed in the casing to the bottom of the drainage well foundation; grouting is carried out at the required positions by the method of making slurry with compressed air inside the pipe; every 4 - 5 m of grouting 3 , the grouting pipeline and the compressed air pipeline are raised upward by 0.1 - 0.2 m and stopped for 10 - 15 minutes. After the grouting liquid solidifies, the grouting pipeline and the compressed air pipeline are inserted into the hard bottom to continue grouting, advancing layer by layer and grouting in layers upward.

[0012] Preferably, after the grouting is completed, the grouting solidification area and the boundary of the grouting hole form a conical structure that is wider at the top and narrower 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, it further includes

[0014] S4. Secondary grouting: The casing is repositioned and drilled again to the bottom of the drainage well foundation, and secondary grouting is carried out by inserting a steel pipe into the upper end of the hole to seal the gaps existing after layered grouting.

[0015] Preferably, step S4 is specifically as follows: The casing is fixed at a changed position and drilled again to the bottom of the drainage well foundation. Hemp rope is wound around a steel pipe with the same diameter as the hole diameter and inserted into the upper end of the hole. After reinforcement, secondary grouting is carried out to fill the gaps existing in the layered grouting.

[0016] Preferably, when the pressure measured by the pressure gauge reaches 10 Mpa during secondary grouting, the grouting ends.

[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 as follows: 1. The method of the present invention can make full use of the convenient construction conditions of drilling on the tailings beach surface and use multiple grouting fillings for sealing. At the same time, the implementation of this process can quickly consolidate the subsidence area on the upper beach surface of the drainage well in the reservoir. With the condensation support of the grouting filling material, the tailings around the leakage point form a conical body with a certain strength, avoiding further leakage of the tailings and promoting the safe operation of the tailings reservoir. 2. The method of the present invention is convenient for construction, with fewer construction machinery and equipment and equipped personnel, simple management, obvious plugging efficiency and effect, effectively avoiding the abandonment of the flood drainage system, reducing the engineering investment in the newly built flood drainage system, and significantly improving the safety and economic benefits of the tailings reservoir of mining enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a flow chart of the plugging method in the embodiment of the present invention;

[0020] Figure 2 It is the plan view after the tailings are plugged in the embodiment of the present invention;

[0021] Figure 3 It is the sectional view after the tailings are plugged in the embodiment of the present invention.

[0022] In the figure: 1. Leakage point of the drainage well arch plate; 2. Grouting consolidation area; 3. Drainage culvert; 4. Tailings; 5. Boundary of the grouting hole. Specific implementation manners

[0023] In order to make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] As the tailings pond operates continuously, the stacking dam body gradually rises, and the tailings pressure inside the stacking dam increases. Affected by the use of the drainage well arch plate material and the construction process, some drainage well arch plates are prone to structural damage, resulting in potential leakage of tailings. Once the arch plate leaks tailings, it is not easy to quickly plug, which will cause a large amount of tailings in the pond to be lost and pollute the surrounding environment downstream, and have a serious impact on the later operation of the tailings pond, forcing the enterprise to invest a large amount of funds in the additional construction of the flood drainage system project, resulting in waste of funds. In this embodiment, when the drainage well arch plate of the tailings pond leaks tailings and cannot be effectively and quickly plugged and reinforced, a plugging method is provided that uses grouting layer by layer from bottom to top to quickly form a conical reinforcement body.

[0025] Under normal circumstances, after the structure of the drainage well arch plate of the tailings pond is damaged, it directly causes tailings to leak and run out. Since the bottom tailings are all fine-grained tailings with a certain concentration, it is not easy to plug the leakage point, which affects the normal heightening operation and use of the tailings pond.

[0026] After the leakage occurs for a period of time, a collapse area centered on the leakage point of the drainage well will be formed on the beach surface in the pond. The grouting plugging plan is to first arrange several floating boats in the collapse area according to the area, and initially fill the collapse area with earth and stone materials or block stones wrapped with geotextiles to improve the bearing capacity of the beach surface for the layout of drilling rig equipment.

[0027] Outside the beach surface collapse area, drill obliquely downward at an angle of 65° to 70° with the horizontal towards the leakage point, and then grout until there is no leakage. When drilling, accurately measure the angle and length to ensure that the construction grouting position is above the bottom of the pond to prevent the laid anti-seepage membrane from being damaged.

[0028] After determining the center point of the drainage well in the beach surface collapse area, a down-the-hole drill is added, and the operation of fixing the casing and drilling holes is carried out. After forming the preliminary drill holes, the compressed air pipeline and the grouting pipeline are installed in the casing to the bottom of the drainage well foundation. Grout is injected at the required positions by the method of creating slurry with compressed air inside the pipe. The grouting liquid uses sodium silicate and cement in a ratio of 1:1. Every time about 5 m of grouting is carried out 3 , the grouting pipe and the air pipe are raised by 0.2 m and stay for 10 - 15 minutes. After it solidifies, the grouting pipe and the air pipe are inserted into the hard bottom to continue grouting. Push forward layer by layer and grout in layers upward.

[0029] After the first grouting (layered grouting) is completed, change the position to fix the casing and re-drill to the bottom. Windings of hemp yarn are wrapped around a steel pipe with the same diameter as the hole diameter and inserted into the upper end of the hole. After reinforcement, secondary grouting is carried out to fill the possible gaps in the first grouting. When the pressure measured by the pressure gauge reaches 10 Mpa during the second grouting, the structural strength and integrity of the entire grouting body are achieved.

[0030] See the attached Figure 2 and 3 , by adopting the above plugging process, a directional drill hole is drilled and grouted from the top of the collapse area to the leakage point 1 of the arch plate of the drainage well, so that the grouting solidification area 2 formed between the entire collapse area and the drainage culvert 3 connected below the drainage well and the boundary 5 of the grouting holes form a structure with a certain strength. After filling with the grouting liquid mixed with sodium silicate and cement in proportion, it quickly solidifies to form a conical structure with a certain strength, and the tailings at the lower part of the collapse area form a unified whole, effectively preventing the further leakage of the tailings 4, creating safe implementation conditions for the emergency repair of the facilities at the bottom of the drainage well. The implementation of the drainage method of the present invention effectively reduces the leakage amount of the tailings, improves the overall structural safety of the collapse area, promotes the safe operation of the flood drainage system, and provides a convenient and reliable new method for plugging the leakage of the arch plate of the drainage well of the tailings pond of the mining enterprise.

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

[0032] The present invention discloses a rapid plugging method for the leakage of tailings from the arch plate of the drainage well of the tailings pond. The method of the present invention can make full use of the convenient construction conditions of drilling holes on the tailings beach surface and use multiple grouting fillings for plugging. At the same time, the implementation of this process can quickly consolidate the collapse area on the upper beach surface of the drainage well in the reservoir. With the condensation support of the grouting filler, the tailings around the leakage point form a conical body with a certain strength, avoiding the further leakage of the tailings and promoting the safe operation of the tailings pond. The method of the present invention is convenient for construction, with fewer construction machinery and equipment and equipped personnel, simple management, obvious plugging efficiency and effect, effectively avoiding the abandonment of the flood drainage system, reducing the engineering investment in the newly built flood drainage system, and significantly improving the safety and economic benefits of the tailings pond of the mining enterprise.

[0033] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A rapid plugging method for tailings leaked from the arch plate of a drainage well in a tailings pond, characterized in that: It includes the following steps: S1. Preliminary filling: For the subsidence area centered on the leakage point of the drainage well arch plate, use stones for preliminary filling. S2. Determination of the grouting hole boundary: On the outer peripheral side of the subsidence area, drill holes obliquely in the direction of the leakage point of the drainage well arch plate along a direction at an angle of 65° - 70° to the horizontal line to form grouting holes, and grout into the grouting holes until there is no leakage to form the grouting hole boundary. S3. Layered grouting: Determine the center point of the drainage well in the subsidence area. Inside the grouting hole boundary and on the outer peripheral side of the drainage well, use a casing to drill holes. Install a compressed air pipeline and a grouting pipeline inside the casing to the bottom of the drainage well foundation. Grout the required positions by the compressed air grouting method inside the casing, and gradually lift the compressed air pipeline and the grouting pipeline upward to achieve layer-by-layer advancement and upward layered grouting.

2. The rapid plugging method for tailings leaked from the arch plate of the drainage well in the tailings pond according to claim 1, characterized in that: Specifically, in step S1, after ore leakage occurs for a period of time, a subsidence area centered on the drainage well leakage point will be formed on the beach surface in the reservoir. According to the area of the subsidence area, arrange several floating boats. Initially, fill the subsidence area with earth and stone materials or boulders wrapped with geotextiles to improve the bearing capacity of the beach surface for the layout of drilling rig equipment.

3. The rapid plugging method for tailings leaking from the arch plate of the drainage well in the tailings pond 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 inside the grouting hole boundary.

4. The rapid plugging method for tailings leaking from the arch plate of the drainage well in the tailings pond according to claim 1, characterized in that: Specifically, in step S3, an down-the-hole drill is added after determining the center point of the drainage well in the subsidence area, and casing drilling operations are carried out within the grouting boundary and on the outer peripheral side of the drainage well to form a preliminary drill hole. Then, a compressed air pipeline and a grouting pipeline are installed in the casing to the bottom of the drainage well foundation; grouting is carried out at the required positions by the method of making slurry with compressed air in the pipe; every 4 - 5 m of grouting 3 , the grouting pipeline and the compressed air pipeline are lifted upward by 0.1 - 0.2 m and left for 10 - 15 minutes. After the grouting liquid solidifies, the grouting pipeline and the compressed air pipeline are inserted into the hard bottom to continue grouting, advancing layer by layer and grouting in upward layers.

5. The rapid plugging method for tailings leaked from the arch plate of the drainage well in the tailings pond according to claim 2, characterized in that: After grouting is completed, the grouting solidification area and the grouting hole boundary form a conical structure with a wider upper part and a narrower lower part. 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.

6. The rapid plugging method for tailings leaked from the arch plate of the drainage well in the tailings pond according to claim 1, characterized in that: After step S3, it also includes: S4. Secondary grouting: Change the position of the casing and re-drill to the bottom of the drainage well foundation, and use a steel pipe to insert into the upper end of the hole for secondary grouting to seal the gaps existing after layered grouting.

7. The rapid plugging method for tailings leaked from the arch plate of the drainage well in the tailings pond according to claim 6, characterized in that: Specifically, in step S4, fix the casing by changing the position, re-drill to the bottom of the drainage well foundation, wind jute around a steel pipe with the same diameter as the hole diameter, insert it into the upper end of the hole, and after reinforcement, conduct secondary grouting to fill the gaps existing in layered grouting.

8. The rapid plugging method for the leakage of tailings from the arch plate of the drainage well in the tailings pond according to claim 7, characterized in that: When the pressure measured by the pressure gauge reaches 10 Mpa during secondary grouting, the grouting ends.

9. The rapid plugging method for tailings leaking from the arch slab of the drainage well in the tailings pond according to any one of claims 1 to 8, 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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