A method for constructing an internal dam in a dump site of an inner-pai open-pit mine

Abstract

The invention discloses a method for constructing an internal dam body in an inner-draining open-pit mine dump. The upper surface connection line of the original water-resisting layer is used as the upper boundary of the artificial water-resisting layer filling reference datum; Set the trapezoidal abutment on the center line; build a stepped retaining dam core wall on the artificial water-resisting layer, arrange reinforcement mesh and grouting pipelines in the retaining dam core wall; Lay the foundation anti-seepage layer, waterproof geotextile, and clay anti-seepage layer successively; strengthen the advancement of the soil discharge working face on the side of the retaining dam core wall far away from the original aquifer, and discard the peelings of the open-pit mine to form a support body; fill the clay anti-seepage layer The space between the original aquifer and the original aquifer forms a sealing body; according to the above steps of construction, the dump site continues to discharge soil, and the facilities formed by the above steps are buried inside the dump site to form a continuous retaining dam. The invention is coordinated with the stripping and drainage operation of the open-pit mine, has good water blocking effect, high reliability of the dam body, little influence on production, and low cost.

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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