Top-slicing filling mining method for extra-thick coal seam

Abstract

A top-slicing filling mining method for an extra-thick coal seam includes the following steps that the ultra-thick coal seam is divided according to the thickness of 2.5-3.5 m into complete filling layers and partial filling layers which are distributed alternately; a top-slicing mining sequence is adopted, and the first complete filling layer is mined firstly, specifically, a solid filling working face is arranged on the complete filling layer, a top plate and a bottom plate are paved with a metal net and a bamboo net correspondingly, falling-filling is carried out in a goaf, and an artificial false roof and am artificial false bottom are manufactured; and the partial filling layers are mined, specifically, strip-shaped fully-mechanized mining faces and filling working faces are arrangedalternately in the partial filling layers, the working faces are filled alternately, and the working faces of the adjacent partial filling layers are arranged in a staggered mode. According to the method, the surface subsidence is effectively controlled, the resource recovery efficiency is improved, and the sustainable development and green efficient exploitation of a mine are realized.

Description

technical field [0001] The invention relates to a "three-down" solid filling coal mining method for extremely thick coal pressing, in particular to a descending layered filling mining method for ultra-thick coal seams. Background technique [0002] With the continuous increase of mining depth, Carboniferous thick, extra-thick and extra-thick coal seams have become the main coal resources for mine mining in my country. At present, for the mining of "three lower" extra-thick coal seams, there are layered mining and top-coal caving mining methods. The above-mentioned coal mining methods all use the caving method to manage the roof, which has caused serious damage to the surface, water sources, and ecological environment. The goal and concept of sustainable development and green mining; in addition, there are methods such as limited thickness mining, strip mining, and grouting to reduce subsidence mining. Although the protection of the environment has been protected to a certain...

AI Technical Summary

Problems solved by technology

At present, for the mining of "three lower" extra-thick coal seams, there are layered mining and top-coal caving mining methods. The above-mentioned coal mining methods all use the caving method to manage the roof, which has caused serious damage to the surface, water sources, and ecological environment. The goal and concept of sustainable development and green mining; in addition, there are methods such as limited thickness mining, strip mining, and grouting to reduce subsidence mining. Although the protection of the environment has been protected to a certain extent, the recovery rate is low and the production cost High, causing a lot of waste of resources

With the rapid development of filling mining technology, filling coal mining technology has been continuously applied to the mining of thick, extra-thick and extra-thick coal seams, which can inhibit the movement of rock strata, effectively protect the surface ecological environment, and improve the resource recovery rate. Both are more complicated and the production efficiency is low

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