摘要
Abstract
In order to prevent and control the rock burst during the initial mining period of the deep gob-side ultra-long mining face,the No.3106 working face of a mine was taken as the engineering background,and the micro-seismic monitoring system was used to statisti-cally analyze the periodicity of the micro-seismic energy,the correlation of the pressure step,and the degree of concentration of the seis-mic source during the initial mining period,and the micro-seismic time sequence law of the deep gob-side ultra-long working face during the initial mining period was studied.The results of the study show that the distribution of micro-seismic events in the early stage of min-ing in the deep gob-side ultra-long working face mainly shows a transfer from near the working face to the back of the face;after the sup-port resistance reaches a peak,the total micro-seismic energy also reaches a peak;after lagging behind the peak of the working resist-ance for 1-3 days,a larger energy event occurs;as the working face continues to advance,the cracks in middle and high sandstone lay-er gradually develop to the entire sandstone layer group,and with the synergistic effect of the overlying rock in the No.3104 goaf of the section,it causes the working face to frequently occur five times the micro-seismic event on the side close to the goaf.关键词
深部/沿空/超长工作面/初采期/微震活动/时序规律Key words
deep/gob-side/ultra-long working face/initial mining period/micro-seismic activity/time sequence law分类
矿业与冶金
