Later-period sub-dam stacking and dam face drainage ditch arrangement mode for tailing pond

Abstract

The invention discloses a later-period sub-dam stacking and dam face drainage ditch arrangement mode for a tailing pond. In the later-period damming process of the tailing pond using an upstream-type tailing damming method with mill tailings, the slope surfaces of later-period stacked sub-dams are controlled according to the initial stage dam body axis of a designed slope requirement aspect, and meanwhile damming needs to be conducted from dam abutments at the two sides of the slope aspect of the stacked sub-dame central axis; dam abutment drainage ditches are constructed in a mountain body and located at the connecting positions of the later-period stacked sub-dams and the mountain body, and are further connected with a dam abutment drainage ditch of an initial stage dam body; a stair of packway is arranged every time when the height of the later-period stacked sub-dams is vertically increased by 5 meters, and the packway width reaches the designed requirement; slope surfaces are designed from the middle of each packway to the dam abutment drainage ditches in the two sides of the slope aspect, and each formed packway is high in the middle and low at the two ends; dam face longitudinal drainage ditches are built on each packway and are based on the dam abutment drainage ditches in the two sides of the slope aspect of the same packway; and a dam face transverse drainage ditch used for junction is built between every two adjacent levels of packway dam face longitude drainage ditches.

Description

technical field [0001] The invention relates to a sub-dam stacking method of a tailings dam in the later stage and an arrangement method of drainage ditches on the dam surface. Background technique [0002] For tailings reservoirs using tailings for upstream tailings damming method, the layout of the sub-dams in the conventional later stage and the drainage ditches on the dam surface are as follows: figure 1 As shown: the outer slope surface of the late accumulation sub-dam is basically a slope perpendicular to the central axis of the early dam, each level of horseway is basically on the same level, and the vertical drainage ditch on the dam surface is also basically on the same level. When the sub-dam is built for a long length, such as greater than 200 meters, multiple small slopes should be set in the vertical drainage ditch towards the dam surface, and it is impossible to use one slope to set up slopes to the abutment drainage ditches on both sides. Therefore, when the ...

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Problems solved by technology

[0002] For tailings reservoirs using tailings for upstream tailings damming method, the layout of the sub-dams in the conventional later stage and the drainage ditches on the dam surface are as follows: figure 1 As shown: the outer slope surface of the late accumulation sub-dam is basically a slope perpendicular to the central axis of the early dam, each level of horseway is basically on the same level, and the vertical drainage ditch on the dam surface is also basically on the same level. When the sub-dam is built for a long period, such as more than 200 meters, multiple small slopes should be set up in the vertical drainage ditch towards the dam surface, and it is impossible to use one slope to set slopes towards the abutment drainage ditches on both sides.

Therefore, when the flood season comes, the catchment water in the vertical drainage ditch of the dam surface of the upper level will gradually pass through the horizontal drainage ditch of the dam surface and collect in the vertical drainage ditch of the dam surface of the lower level of the horseway, and the collected water will gradually flow down to the lower level. The accumulation of water in the vertical drainage ditch of the dam surface, the greater the amount of water sinks and cannot be discharged into the abutment drainage ditch in time, finally causing the catchment water to overflow the vertical drainage ditch of the dam surface and flush the outer slope of the accumulated sub-dam, causing the dam surface to pull ditch, in severe cases, it will affect the safety of the dam body

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