Pipe network system and its construction method for treating permafrost in tailings pond combined with drainage facilities

Abstract

The invention discloses a pipe network system for treating frozen soil of a tailings pond by combining a drainage facility and a construction method for the pipe network system. The pipe network system comprises water guide pipes, transverse drainage pipes and vertical communication pipes, wherein the end heads of the transverse drainage pipes extend out of the tailings pond to communicate with atmosphere; and the middle sections of the transverse drainage pipes communicate with a flood drainage facility of the tailings pond through the vertical communication pipes. The construction method for the pipe network system comprises the following steps of: starting to accumulate tailings and embedding the vertical communication pipes after a dam and the flood drainage facility are constructed at an initial stage of the tailings pond; embedding the first-grade water guide pipes and the transverse drainage pipes after accumulation elevation of the tailings is higher than dam top elevation of the dam at the initial stage, and selectively embedding inclined communication pipes; and increasing elevation and number of the water guide pipes, the vertical communication pipes, the transverse drainage pipes and the inclined communication pipes step by step with increase of accumulation elevation of the tailings until laying is completed. The pipe network system is simple in structure, is convenient to construct, is relatively low in cost, and can efficiently treat the frozen soil of the tailings pond.

Description

technical field [0001] The invention belongs to the field of mine tailings ponds, and in particular relates to a pipe network system and a construction method for controlling frozen soil in tailings ponds. Background technique [0002] Permafrost refers to various rocks and soils below zero degrees Celsius and containing ice. Frozen soil involves the coupling of the physical properties of soil, water, and ice, as well as the heat conduction of the atmosphere, the frozen soil layer, and the underlying rock and soil mass. [0003] The phenomenon of permafrost in tailings ponds is essentially the same as that in nature, both have freezing and thawing processes, and can be divided into permafrost and seasonal permafrost, but there are also significant differences: 1 ) The ground in nature is basically fixed, while the beach surface of tailings accumulation dams is constantly rising, and the ice surface rises and the beach surface rises synchronously. Depth of permafrost; 2) Wh...

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Problems solved by technology

[0007] 2) Reduce the precipitation effect of drainage facilities: due to the water-proof effect of the deep frozen layer, whether it is vertical seepage drainage or horizontal drainage, or the drainage of pre-buried or added later, it is due to the water-proof effect of the horizontal frozen layer. It is difficult to form a vertical precipitation funnel, which greatly reduces the precipitation effect of drainage facilities

[0008] 3) Decrease the stability of the dam body: the buried depth of the soaking line is an important factor affecting the slope stability of the tailings dam, and the increase of the soaking line will inevitably reduce the stability of the dam slope

[0014] Although the permafrost problem can be reduced to a certain extent after the above-mentioned measures are taken, it will inevitably affect mine production.

Especially in order to prevent the formation of deep permafrost, the ore drawing measures in front of the dam can only be resumed after the permafrost melts, which will directly lead to a significant reduction in mine production, or even stop production

For areas with a long freezing period, the permafrost layer is relatively thick, and the thawing time is correspondingly long. The production reduction or shutdown time is too long, and the economic loss is often unbearable.

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