Method for constructing internal dam body of internally-discharged strip mine dump

Abstract

The invention discloses a method for constructing an internal dam body of an internally-discharged strip mine dump. The method comprises the following steps that an upper surface connecting line of an original water-resisting layer is taken as an artificial water-resisting layer to fill a reference datum upper boundary; a dam body foundation pit is arranged, and a trapezoidal base platform is arranged on the center line of the dam body foundation pit; a halfpace-shaped water retaining dam core wall is built on the artificial water-resisting layer, and a reinforcing mesh and a grouting pipeline are arranged in the water retaining dam core wall; a foundation anti-seepage layer, waterproof geotechnical cloth and a clay anti-seepage layer are sequentially laid on the side, close to an original aquifer, of the water retaining dam core wall; advancing of a dumping working face is enhanced on the side, away from the original aquifer, of the water retaining dam core wall, and strip mine stripping objects are discharged to form a supporting body; a space between the clay anti-seepage layer and the original aquifer is filled to form a plugging body; and the construction is carried out according to the steps, the dump continues dumping, the facility formed in the steps is buried inside the dump, and a continuous water retaining dam is formed. The dam body is coordinated with strip mine stripping, mining and discharging operation, the water blocking effect is good, the dam body reliability is high, the influence on production is small, and the cost is low.

Description

technical field [0001] The invention relates to a method for constructing a water-blocking dam body, in particular to a method for constructing an internal dam body in an inner-discharge open-pit mine dump. Background technique [0002] ‌During the open-pit mining process, because the mining depth can reach 200-300m, it is very easy to expose the shallow aquifer. The outflow of a large amount of groundwater will not only cause waste of water resources, but also the inflow of groundwater into the open-pit mining area will affect the production operations of the open-pit mine Safety, artificial drainage increases the production cost of the mine. After the open-pit mine is mined, the dump formed by internal drainage will bury the aquifer and prevent the loss of groundwater to a certain extent. However, the material accumulation in the dump formed by the normal dump operation of the open-pit mine has well-developed pores, good connectivity, and poor cementation effect 1. The se...

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Problems solved by technology

[0002] ‌During the open-pit mining process, because the mining depth can reach 200-300m, it is very easy to expose the shallow aquifer. The outflow of a large amount of groundwater will not only cause waste of water resources, but also the inflow of groundwater into the open-pit mining area will affect the production operations of the open-pit mine Safety, artificial drainage increases the production cost of the mine

After the open-pit mine is mined, the dump formed by internal drainage will bury the aquifer and prevent the loss of groundwater to a certain extent. However, the material accumulation in the dump formed by the normal dump operation of the open-pit mine has well-developed pores, good connectivity, and poor cementation effect , The anti-seepage effect is not good, and the water body is easy to seep into the dump site, reducing the stability of the dump site slope and causing safety hazards

However, the construction of earth-rock dams used in water conservancy projects has strict requirements on material selection, construction equipment, and operating methods. Its application in the dam construction of open-pit mine dumps has problems such as large impact on normal production, long construction period, and high cost. Therefore, it is urgent It is necessary to develop a method of constructing the dam body of the open-pit dump that is coordinated with the stripping operation of the open-pit mine to prevent the water in the formation from seeping into the dump

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