Mining method of short- and long-wall portion of under-village coal

Abstract

The invention discloses a mining method of a short- and long-wall portion of under-village coal, comprising steps: determining a face mining width extremum according to rock formation properties of a mining site in connection with face mining equipment supporting to obtain a face mining width range; determining an extremum of strip pillar reserved width between faces according to overlying stratum depth and overlying rock lithological conditions in connection with Wilson's theory, thus obtaining a strip pillar reserved width range; pairing face mining width and pillar reversed width by using an orthogonal method according to the face mining width range and isolation pillar reserved width range to form multiple schemes, and subjecting each scheme to pillar stability check and mining subsidence prediction to select optimal schemes; determining a mining sequence of strip multiple faces according to the principle of mining an area right under a building prior to lateral mining; the method has high operating efficiency, low cost and environmental friendliness.

Description

technical field [0001] The invention relates to the technical field of pressed coal mining, in particular to a method for mining the short and long walls of pressed coal under a village. Background technique [0002] my country has a lot of coal and lacks oil and gas. As the largest energy source in China, coal accounts for about 63% of energy consumption. In the next few decades, the domestic energy structure dominated by coal will not change much. The coal industry The healthy development of energy is related to national energy security and sustainable economic development. However, with the increase in the mining intensity of coal resources in recent years, the recoverable reserves of mines have decreased year by year, and the problem of aging has become increasingly serious. Many old mines are facing the dilemma of closing wells and pits. At the same time, although most of the old mines are short of conventional resources, the "three-down" compressed coal resources are s...

AI Technical Summary

Problems solved by technology

[0004] Strip mining is a common partial mining method. Although many strip mining tests and application promotions have been carried out in China, there are still many technical problems in strip mining: due to the short length of the working face, fully mechanized mining equipment is difficult to put into use , only blast mining or high-grade general mining technology can be used, the overlying rock is greatly disturbed, the production efficiency is low, and the safety situation is poor. It is very difficult to fit the surface movement parameters of multiple strip working faces, the prediction accuracy of surface movement and deformation in strip mining is poor, and the mining of some strip working faces has not achieved the effect of protecting surface buildings (structures)

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