Internal circulation system for unwatering water-containing layer of strip mine

Abstract

The invention provides an internal circulation system for unwatering water-containing layer of a strip mine. The internal circulation system is characterized by comprising a plurality of drainage wells arranged around a mining field or in the direction of a main supply source, and a submersible electric pump and a lifting pipe thereof are arranged in each drainage well to pump water, namely drainage water; and the internal circulation system is further provided with a fracture recharge well and a recharge system, according to the fracture recharge well, a bedrock fracture recharge well is constructed at the position about 0.25 R away from the drainage dewatering well in the direction away from the mining field, the construction technology and the drilling structure of the recharge well are the same as those of the drainage well, a non-recharge stratum on the upper portion of the recharge well is sealed through clay, a lower fissure aquifer is completely provided with steel round hole net-wrapped water filter pipes, a casing pipe is a spiral seam welded steel pipe, and a wellhead is 0.5 m higher than the earth surface, according to the recharge system, a main pipeline of a lifting pipe is directly laid into a well wall pipe of a recharge well by 2 m, the well wall pipe of the recharge well and the lifting pipe are sealed through a rubber ring, drained water is recharged into the recharge well through the main pipeline of the lifting pipe, and meanwhile part of the drained water is distributed to serve as production and domestic water.

Description

technical field [0001] The invention relates to a method for controlling the groundwater level by using a draining well in an open-pit mine, in particular to an internal circulation system of the draining water aquifer of the open-pit mine. Background technique [0002] Open-pit mines usually use drainage wells to control the groundwater level. Although the long-term and quantitative pumping of groundwater in the water-filled aquifer can ensure the stability of the water level in the mining boundary, it also causes a drop in the groundwater level around the mining boundary, and a large number of areas where groundwater is formed The groundwater level drop funnel will cause land subsidence, ground subsidence, cause rivers and lakes to dry up, springs and wells to dry up; affect vegetation growth; cause land desertification, soil erosion and a series of ecological and environmental problems. At the same time, the discharge of excess drained water not only pollutes the environm...

AI Technical Summary

Problems solved by technology

[0002] Open-pit mines usually use drainage wells to control the groundwater level. Although the long-term and quantitative pumping of groundwater in the water-filled aquifer can ensure the stability of the water level in the mining boundary, it also causes a drop in the groundwater level around the mining boundary, and a large number of areas where groundwater is formed The groundwater level drop funnel will cause land subsidence, ground subsidence, cause rivers and lakes to dry up, and springs and wells to dry up; affect vegetation growth; cause land desertification, soil erosion and other ecological and environmental problems

At the same time, the discharge of surplus drained water not only pollutes the environment of the open-pit mining area again, but also wastes water resources in vain, which seriously restricts the implementation of near-zero discharge of mine water.

Images