摘要
Abstract
Aiming at the technical difficulties such as the influence of fault traction on the 7521 working face of Wuyang Coal Mine during the period of passing through the 7521-2#reverse fault,the footwall coal body of the fault moves downward,and the exposed rock body section in the head of the working face is large and the hardness is high,when the coal mining machine forcibly breaks the rock,the stoping efficiency is low,the amount of broken rock is large,the equipment failure rate is high and others.Through comparative analysis of the fault passage stoping scheme,a combined stoping technique of"rotating mining+downward inclined stoping"is proposed,and a combined support technology of"advanced pipe shed grouting+flexible fiber mesh+fiberglass trapezoidal beam"is adopted for the downward inclined stoping roof.The application effect shows that after adopting the downward inclined stoping technique,the rock breaking amount in the fault area can be reduced by 2784 m3,the equipment maintenance cost can be reduced by 279 000 yuan,and the stoping speed can be increased to 4.8 m/d;After adopting joint support,the end face distance of the working face is reduced to 0.3 m,the length of the coal wall caving is reduced to 1.6 m,the depth of the wall caving is reduced to below 0.5 m,the initial support force of the support and working resistance are increased to over 98%,achieving significant application results.关键词
综采工作面/断层/旋转回采/俯斜回采/支护技术Key words
fully mechanized mining face/fault/rotating stoping/downward inclined stoping/support technology分类
矿业与冶金
