Aquifer freezing-based underground long-wall working face water-preserved coal mining method

Abstract

The invention discloses an aquifer freezing-based underground long-wall working face water-preserved coal mining method. The aquifer freezing-based underground long-wall working face water-preserved coal mining method comprises taking into consideration the overlying strata moving features during a mining process, according to the spatial position of a target aquifer and the mining size, buried depth and mining subsidence parameters of a working surface, determining the position of the frozen curtain of the aquifer unexcavated; after the frozen curtain is formed, performing mining of the working surface; after mining the working surface is completed, unfreezing the aquifer to restore moisture of the aquifer. The aquifer freezing-based underground long-wall working face water-preserved coalmining method is simple and easy to implement and reasonable in design, can achieve safe and efficient coal mining based on water resource preservation as well as coordination between resource exploitation and ecological environment protection.

Description

technical field [0001] The invention relates to a water-retaining mining method under a loose aquifer in an underground coal mine, in particular to a water-retaining coal mining method for an underground longwall working face based on freezing of the aquifer, and belongs to the technical field of underground coal mining. Background technique [0002] With the strategic transfer of my country's coal resources and the continuous improvement of mining technology, coal production presents a large-scale, high-intensity mining model. However, ignoring the protection of water resources is likely to cause a series of ecological environment deterioration problems such as soil erosion and land desertification, and the ecological restoration after damage is often costly and difficult. Under the new normal of the development of the coal industry, "the coal production mode must be transformed into safe, efficient, intelligent and green mining". Water conservation measures to ensure safe...

AI Technical Summary

Problems solved by technology

The main key technologies are: (1) Height-limiting or layered mining technology to reduce the development height of the water-conducting fracture zone; (2) Partial mining methods such as strip mining or room-and-pillar mining, which weaken the mining area by retaining coal pillars to support the overlying rock. (3) Goaf filling is used to reduce the migration space of the overlying rock; (4) Groundwater is drained in the grouting curtain before mining to prevent and control floods from the perspective of safety, but it causes the loss of water resources and Post-harvest aquifers lose their water-bearing function

These technologies may have problems such as low resource recovery rate, low mining efficiency, or partial loss of water resources.

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