The Study Of The Mining Movement Rule Under The Thick Loose Layer And Application

Based on the Guqiao coal mine 1117(1) working face which is mined under very thick loose layer, and this working face uses bottom drill and groud gas drill to gather gas.This article adopt multi-research methods,such as the theoretical analysis, computer numerical simulation,and field surveying, it processed the systemic research to the rock moving rule mined under thick loose layer. First, this article use FLAC3D simulate influence of mining hight to overlaying rock movment.Then, simulate overlaying rock different movment condition under different speed with FLAC2D,educe different influnce under different mining speed.Finally,simulating overlaying rock distortion with ANSYS numerical simulating software,especially analyse overlaying rock distortion under different surface soil thickness,and discuss the influence of different surface soil thickness to gas drill distortion.Through the above numerical simulating analysis,and then combining field geological conditions,test the distribution of gas dill under very thick loose layer,and validate the rationality of simulating result. This article research results offer theory reference to gas ditribution mined under very thick loose layer;simultaneously,it also offers technical guarantee for constructing high production and high efficiency mine; in the end,gas pumping breaks traditional gas drainage,turn gas into treasure,offering a way for green mining.