Metal mine goaf tailings slurry filling retaining wall

Abstract

The utility model relates to a kind of metal mine goaf tailings slurry filling retaining wall, involve metal mine exploitation safety technical field, including the retaining wall of being set at roadway entrance, drainage hole being set on retaining wall and the filter layer of being set at the side of retaining wall close to goaf, and retaining wall outside C25 concrete surface layer, filter layer is spaced apart from retaining wall, set filter layer, can share the horizontal earth pressure of lower retaining wall, guarantee the stability of retaining wall structure, and allow water to pass freely, but simultaneously effective intercept fine particle's tailings, prevent it from losing with water, block drainage hole, cause drainage system failure and retaining wall pressure surge, filter layer is spaced apart from retaining wall, interval space forms a drainage blind ditch, clear water that seeps out from filter layer can be gathered here, and successfully discharge through lower drainage hole, avoid water accumulation between filter layer and retaining wall, concrete surface layer can effectively isolate seepage effect in mortar rubble, to avoid slurry outflow.

Description

Technical Field

[0001] This utility model belongs to the field of safety technology for metal mining, and specifically relates to a tailings mud backfill retaining wall for metal mine goaf areas. Background Technology

[0002] If the goaf formed after underground mining of metal mines is not treated in a timely manner, it can easily lead to safety accidents such as surface subsidence and pillar instability. Filling the goaf with tailings slurry is a common treatment method, requiring the construction of retaining walls at the goaf entrance to contain the slurry. Traditional retaining walls often use masonry structures, which have problems such as insufficient seepage prevention, easy clogging of drainage holes, and poor overall anti-sliding properties, affecting the filling effect and long-term safety. Furthermore, current technology places drainage pipes in the goaf location; due to the pressure of the slurry, the drainage pipes may deform or be damaged. In such cases, ore needs to be placed inside the drainage pipes, but this inevitably leads to blockage.

[0003] Therefore, in order to address the above-mentioned technical problems, designing a tailings mud backfill retaining wall in the goaf of a metal mine to ensure good stability, impermeability, and smooth drainage is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a tailings mud filling retaining wall for metal mine goaf areas, which improves the stability and impermeability of the retaining wall and ensures smooth drainage.

[0005] To achieve the above objectives, this utility model provides the following solution: A tailings mud backfilling retaining wall for a metal mine goaf includes a retaining wall at the entrance of a roadway, drainage holes on the retaining wall, and a filter layer on the side of the retaining wall near the goaf, wherein the filter layer is spaced apart from the retaining wall.

[0006] Preferably, the drainage holes are arranged in two rows, and the two rows of drainage holes are staggered.

[0007] Preferably, the drainage hole is inclined toward the side away from the goaf.

[0008] Preferably, the inclination angle of the drain hole is 5 to 10 degrees.

[0009] Preferably, a drainage pipe is provided inside the drainage hole, and the inner wall of the drainage pipe is wrapped with geotextile.

[0010] Preferably, the drainage hole near the bottom surface of the retaining wall is 2.5 meters to 3.5 meters away from the bottom surface of the retaining wall, and the drainage hole away from the bottom surface of the retaining wall is located near the top of the retaining wall.

[0011] Preferably, the bottom of the filter layer is at the same elevation as the bottom of the retaining wall, and the height of the filter layer is 1 meter to 1.5 meters.

[0012] Preferably, the cross-section of the filter layer is an isosceles trapezoidal structure, and the vertical distance from the center of the isosceles trapezoidal structure to the side of the retaining wall near the filter layer is 1.5 meters to 2.5 meters.

[0013] Preferably, the retaining wall has a trapezoidal cross-section.

[0014] Preferably, the retaining wall has a concrete layer on the side away from the goaf.

[0015] The present invention achieves the following technical advantages over the prior art: By setting up a filter layer, the horizontal earth pressure on the lower retaining wall can be shared, ensuring the stability of the retaining wall structure. On the other hand, the filter layer allows water to pass freely, but at the same time effectively intercepts fine tailings, preventing them from being lost with the water and clogging the drainage holes, thus causing the drainage system to fail and the pressure on the retaining wall to surge. By setting the filter layer and the retaining wall separately, this gap forms a drainage blind ditch, where the clean water seeping from the filter layer can collect and be smoothly discharged through the lower drainage holes, avoiding water accumulation between the filter layer and the retaining wall. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Appendix Figure 1 This is a side view structural schematic diagram of a tailings mud backfill retaining wall in a metal mine goaf disclosed in an embodiment of this utility model. Appendix Figure 2 This is a schematic diagram of the main view structure of the tailings mud backfill retaining wall in the goaf of a metal mine, as disclosed in the embodiments of this utility model. The components are: 1. Retaining wall; 2. Second drainage hole; 3. First drainage hole; 4. Drainage pipe; 5. Geotextile; 6. Filter layer; 7. Bottom surface of retaining wall; 8. Concrete layer. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] The purpose of this invention is to provide a tailings mud backfill retaining wall for metal mine goaf areas, which has good stability and seepage prevention, and smooth drainage.

[0020] refer to Figures 1-2 The tailings mud backfill retaining wall 1 disclosed in this embodiment of the utility model includes at least a retaining wall 1 set at the entrance of the roadway. The retaining wall 1 is provided with drainage holes. A filter layer 6 is provided on the side of the retaining wall 1 near the goaf. The filter layer 6 is set at intervals with the retaining wall 1. By setting the filter layer 6, on the one hand, it can share the horizontal earth pressure of the lower retaining wall 1 and ensure the stability of the retaining wall 1 structure. On the other hand, the filter layer 6 allows water to pass freely, but at the same time effectively intercepts fine tailings sand, preventing it from being lost with water and clogging the drainage holes, thereby causing the drainage system to fail and the pressure of the retaining wall 1 to surge. The interval between the filter layer 6 and the retaining wall 1 forms a drainage blind ditch. The clean water seeping from the filter layer 6 can be collected here and discharged smoothly through the lower drainage holes, avoiding the accumulation of water between the filter layer 6 and the retaining wall 1.

[0021] It should be noted that retaining wall 1 is a masonry structure with a mortar strength grade of M7.5 and a stone strength grade of MU30. The filter layer 6 is made of waste rock.

[0022] refer to Figure 1 and Figure 2In one implementation method, the drainage holes are arranged in two rows, staggered (in a quincunx pattern). The drainage holes in the lower row are designated as the first drainage holes 3, and the drainage holes in the upper row are designated as the second drainage holes 2. The first drainage holes 3 are used for drainage during the first filling and are the main drainage channel. The first drainage holes 3 located at the bottom can most effectively drain the water accumulated at the bottom, quickly lower the water level at the bottom of the filling body, and promote the initial settling and bottom consolidation of the tailings. At this time, the second drainage holes 2 are located above the filling liquid surface and are in a "standby" state, not participating in drainage, thus avoiding the risk of being blocked by the mud with the highest initial concentration and finest particles. After the tailings of the first filling have initially consolidated, the second filling is carried out to raise the liquid level to the design height, which usually submerges the first drainage holes 3. At this time, the second drainage holes 2 become a new and efficient drainage force in this stage because they have not been used before and their orifices are unobstructed, allowing them to immediately and efficiently drain the precipitated water generated during the second filling. The combined action of the upper and lower rows of drainage holes completes the final drainage and consolidation of the entire goaf filling body.

[0023] It should be noted that the horizontal spacing between the drainage holes in the same row is 4m, the diameter of the drainage hole is 50mm, the first drainage hole 3 is higher than the ground or water level in front of the retaining wall 1, there are 10 first drainage holes 3 and 8 second drainage holes 2.

[0024] refer to Figure 1 and Figure 2 As one implementation method, the first drainage hole 3 and the second drainage hole 2 are inclined toward the side away from the goaf, that is, all drainage holes are inclined toward the roadway side, which allows water to pass through the filter layer 6, enter the inclined pipe, and be smoothly discharged into the roadway with the help of gravity.

[0025] refer to Figure 1 and Figure 2 As one implementation method, the inclination angle of the first drainage hole 3 and the second drainage hole 2 is 5 to 10 degrees. An angle of 5 to 10 degrees is sufficient to ensure that the water can flow out smoothly and naturally by using gravity. This slope provides a clear direction of water flow, avoids water accumulation in the pipe, and thus effectively prevents backflow. If the angle is too large, it will pass through a longer wall path, which will further weaken the integrity of the retaining wall 1 structure. Moreover, the steeper the angle of drilling or pre-embedding the pipe, the greater the difficulty of construction accuracy and control.

[0026] refer to Figure 1 and Figure 2 In one embodiment, a drainage pipe 4 is provided in the first drainage hole 3 and the second drainage hole 2. The inner wall of the drainage pipe 4 is wrapped with geotextile 5. The drainage pipe 4 needs to be pre-embedded in the masonry to avoid the masonry blocks squeezing the drainage pipe 4. Wrapping the drainage pipe 4 with geotextile 5 can prevent water from flowing out from the gap between the outside of the drainage pipe 4 and the masonry.

[0027] refer to Figure 1 and Figure 2 In one embodiment, the vertical distance between the first drainage hole 3 and the bottom surface 7 of the retaining wall is 2.5 meters to 3.5 meters, and the second drainage hole 2 is set close to the top of the retaining wall. Setting the first drainage hole 3 at a height of 2.5-3.5 meters, rather than directly close to the bottom plate, is sufficient to effectively drain the water accumulated in the bottom maximum pressure zone, while avoiding the impact of slight deformation or siltation on the hole opening function due to possible slight deformation or siltation of the roadway floor plate. Setting the second drainage hole 2 close to the top of the retaining wall 1 means that the second filling can almost completely fill the goaf area, up to the top plate of the roadway, maximizing the use of filling space, reducing the volume of the goaf area, and improving the mining recovery rate.

[0028] refer to Figures 1-2 In one embodiment, the bottom of the filter layer 6 is at the same elevation as the bottom surface of the retaining wall 7. The height of the filter layer 6 is 1 to 1.5 meters, the height of the first drain hole 3 is between +2.5m and +3.5m, and the top of the filter layer 6 (+1.0m to +1.5m) is located below it, forming a critical protective overlap area. At this time, the area from the reference horizontal plane to the first drain hole 3, where the pressure is the greatest, the water flow is the most concentrated, and the particles are most likely to be lost, is completely and seamlessly covered by the filter layer 6. Before the water flow reaches the lower drain hole, it must be effectively filtered by the filter layer 6.

[0029] refer to Figures 1-2 In one implementation, the cross-section of the filter layer 6 is an isosceles trapezoidal structure. The distance from the center of the isosceles trapezoidal structure to the side of the retaining wall 1 closest to the filter layer 6 is 1.5 meters to 2.5 meters. The hypotenuse of the trapezoid generates greater friction and interlocking with the internal tailings backfill and the external retaining wall 1 / surrounding rock, which greatly enhances the overall anti-slip and anti-overturning capacity of the filter layer 6, preventing it from being pushed over or deformed under lateral mud pressure. Setting the vertical distance between the center of the filter layer 6 and the retaining wall 1 to 1.5 meters to 2.5 meters ensures sufficient space for water to converge and flow smoothly, avoiding blockage.

[0030] refer to Figures 1-2 As one implementation method, the retaining wall 1 has a trapezoidal cross-section with a top width of 0.6m, a bottom width of 1.5m, a length of 40m, and a height of 6.7m. The trapezoidal structure can ensure the stability of the retaining wall 1 and fit the shape of the goaf opening.

[0031] refer to Figures 1-2As one implementation method, a concrete layer 8 is provided on the side of the retaining wall 1 away from the goaf. The concrete layer 8 is made of C25 concrete with good frost resistance, corrosion resistance and high strength. The concrete layer 8 is supported by steel bars. The concrete thickness is usually 80mm~150mm. The mix ratio is controlled between 0.4 and 0.5 water-cement ratio. The cement content should not be too low, generally not less than 400kg / m³. The aggregate should have a maximum particle size of not more than 15mm and good gradation to ensure sprayability and reduce rebound. The seepage rate in this project is small. The concrete seepage resistance grade reaches P6 standard. The concrete layer 8 acts as an additional safety barrier. Even if there are small cracks inside the main retaining wall 1 or the bearing capacity reaches the limit, the concrete layer 8 can provide additional support to prevent catastrophic damage.

[0032] As a preferred embodiment, retaining wall 1 is constructed with M7.5 mortar and MU30 rubble masonry, forming a trapezoidal structure with a top width of 0.6m and a bottom width of 1.5m, a length of 40m, and a height of 6.7m. Two rows of 50mm diameter drainage holes are made on retaining wall 1. The first drainage hole 3 is 3m above the ground, and the second drainage hole 2 is located at the top. The horizontal spacing of the drainage holes in the same row is 4m, and they are arranged in a staggered quincunx pattern, for a total of 18 holes. Drainage pipes 4 are installed in the drainage holes, and the inner side is wrapped with geotextile 5. The holes are inclined outward at a 5% slope. On the side of retaining wall 1 closest to the goaf, a 120cm high layer of waste rock is piled up as a filter layer 6 to ensure unobstructed drainage and prevent slurry leakage. A layer of sprayed concrete 8 is applied to the outside of retaining wall 1 to further ensure that the slurry does not leak out, while maintaining a consistent color with the surrounding rocks.

[0033] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0034] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered as exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A tailings mud backfill retaining wall for mining goaf in a metal mine, characterized in that, It includes a retaining wall at the entrance of the roadway, drainage holes on the retaining wall, and a filter layer on the side of the retaining wall near the goaf, wherein the filter layer is spaced apart from the retaining wall.

2. The tailings mud backfill retaining wall for metal mine goaf according to claim 1, characterized in that, The drainage holes are arranged in two rows, and the two rows of drainage holes are staggered.

3. The tailings mud backfill retaining wall for metal mine goaf according to claim 2, characterized in that, The drainage hole is tilted toward the side away from the goaf.

4. The tailings mud backfill retaining wall for metal mine goaf according to claim 3, characterized in that, The inclination angle of the drain hole is 5 to 10 degrees.

5. The tailings mud backfill retaining wall for metal mine goaf according to claim 2, characterized in that, A drainage pipe is installed inside the drainage hole, and the inner wall of the drainage pipe is wrapped with geotextile.

6. The tailings mud backfill retaining wall for metal mine goaf according to claim 2, characterized in that, The drainage holes near the bottom of the retaining wall are 2.5 meters to 3.5 meters apart vertically, while the drainage holes away from the bottom of the retaining wall are located near the top of the retaining wall.

7. The tailings mud backfill retaining wall for metal mine goaf according to claim 6, characterized in that, The bottom of the filter layer is at the same elevation as the bottom of the retaining wall, and the height of the filter layer is 1 meter to 1.5 meters.

8. The tailings mud backfill retaining wall for metal mine goaf according to claim 7, characterized in that, The cross-section of the filter layer is an isosceles trapezoidal structure, and the vertical distance from the center of the isosceles trapezoidal structure to the side of the retaining wall closest to the filter layer is 1.5 meters to 2.5 meters.

9. The tailings mud backfill retaining wall for metal mine goaf according to claim 1, characterized in that, The retaining wall has a trapezoidal cross-section.

10. The tailings mud backfill retaining wall for metal mine goaf according to claim 1, characterized in that, The retaining wall has a concrete layer on the side away from the goaf.

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