Deep-hole Pre-grouting Reinforcement Technology in Final Mining of Working Face with Large Mining Height
In response to the problem of roof fall during the final mining period of the working face with large mining height in Sihe Coal Mine,in-depth analysis of the distribution law of advanced support pressure,deep hole pre-grouting reinforcement mechanism,and reasonable grouting reinforcement timing of 5303 working face in Sihe Coal Mine was carried out,and though optimizing the grouting materials and processes,a coupling reinforcement scheme of advanced deep-hole pre-grouting,pre-grouting of the removal channel,and shallow-hole grouting of the working face was proposed.Practice showed that the deep-hole pre-grouting reinforcement achieved good application results;during the final mining period,the coal slope was basically flat,and there was no large-scale or deep fragmentation phenomenon;the last 15 m of the working face was successfully mined in just 3 d,ensuring safe production during the support withdrawal period.
final mining of working facecoal wall cavingdeep-hole pre-grouting
NETL
NSTL
万方数据
