A filter wall for upstream tailings pond

Abstract

The invention relates to a water filtration wall for an upstream type tailing pond. According to the technical scheme, the water filtration wall is formed by a first water filtration wall body (12), a second water filtration wall body (13) and a third water filtration wall body (14) in an enclosed mode. The first water filtration wall body (12) and the second water filtration wall body (13) extend outwards from the two sides of a mountain slope (1) correspondingly and are correspondingly connected with the two ends of the third water filtration wall body (14). The main bodies of the water filtration wall bodies have the same cross-section shape which is a constant-section isosceles trapezoid. According to each isosceles trapezoid, a concrete interlayer (10) is arranged in the middle and located at the perpendicular bisector of the top edge of the isosceles trapezoid, 4-16 layers of water collecting plates (4) are symmetrically arranged on the two sides of the concrete interlayer (10), and a row of water filtration pipes (9) is arranged above each layer of water collecting plates (4). Each concrete interlayer (10) is uniformly provided with water collecting wells (16), gravel (5) is symmetrically laid on the two sides of each concrete interlayer (10), and geotechnical cloth (11) is laid on the inclined surface of the gravel (5). The water filtration wall for the upstream type tailing pond has the advantages that the seepage drainage and stopping effects are good, cost is low, a dam body is safe and steady and construction is easy and convenient.

Description

technical field [0001] The invention belongs to the technical field of seepage drainage of upstream tailing ponds. Specifically, it relates to a filter wall used for an upstream tailings pond. technical background [0002] The tailings pond is a special site for stacking tailings by using the existing terrain to pile up a stable dam body. The dam construction methods of sub-dams at all levels can be divided into upstream type, downstream type and mid-line type. The tailings pond formed by the upstream type of sub-dams at all levels is called the upstream tailings pond. The upstream tailings pond has the advantages of small investment, Due to the advantages of simple construction technology and convenient operation and management, most mines use upstream tailings ponds. [0003] The sub-dams of all levels of upstream tailings ponds are mostly built by tailings alluvial method. For large and medium-sized tailings ponds, the height of each sub-dam along the upstream direction...

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Problems solved by technology

[0005] "A reverse seepage drainage system suitable for upstream tailings ponds and upstream tailings ponds" (CN204435430U) patented technology uses a reverse seepage drainage system to drain seepage from upstream tailings ponds. The system has the following deficiencies: 1. In the early tailings discharge process, it is necessary to continuously lay seepage blind ditch in the tailings. In the later tailings discharge process, it is necessary to continuously lay aqueducts and seepage blind ditch in the tailings. The construction is more cumbersome , the construction cost of the tailings pond is not easy to control; 2. In the process of stacking the tailings in the later stage, the fine-grained tailings in the tailings water will gradually accumulate around the seepage channels of the seepage well and the reverse filter layer of the blind drainage ditch to form a slime interlayer , which reduces the seepage effect, and the tailings water clarification area is relatively high, and the tailings water seeps through the cutoff wall to the downstream direction, causing the infiltration line of the lower reservoir to rise, posing a threat to the stability of the sub-dam; 3. Seepage blind ditch , Seepage collection wells are all constructed in the tailings, the installation of pipe fittings is inconvenient, and the construction is difficult

[0006] Song Zhi compared the seepage effect of the seepage wall formed by the seepage well and the water collection pipe in the upstream tailings pond (Song Zhi. Analysis of seepage wall technology and seepage effect [J]. Hunan Nonferrous Metals, 2012, 28(1): 5-8.), proposed a seepage drainage method with a relatively good drainage effect of multi-layer water collection pipe drainage wall, but the drainage facility also has the following shortcomings: 1. Water wells, water collection pipes and plastic inserts are inconvenient to transport and install in the tailings, and construction is difficult; 2. With the height of the tailings, the infiltration line upstream of the seepage wall cannot be effectively reduced, and the infiltration line is likely to cause the upstream direction of the seepage wall The sub-dam is not stable; 3. The water collecting pipe is prone to clogging to varying degrees in the later stage of tailings discharge, which weakens the seepage drainage effect, and the tailings water seeps downstream, and the infiltration line tends to follow the sub-dam slope in the downstream direction of the seepage wall out, it is easy to cause the instability of the sub-dam body

[0007] It can be seen that although the existing upstream tailings pond drainage method can achieve better seepage drainage effect in the early stage, as the tailings continue to pile up, the fine-grained tailings in the tailings water will continue to be buried in the early stage. Sludge interlayers are formed around the seepage drainage facilities, resulting in poor seepage drainage effects of the drainage facilities

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