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基于相似模拟试验对工作面回采工程中应力变化和顶底板运动情况进行的分析,得出工作面开采可能导致其上超过50 m范围内产生矿震现象,工作面前方10 m范围内应力集中急剧增加;由于切顶巷的弱化作用,使采空区悬顶长度减小,有效降低了前方煤体应力;随着切顶巷间距减小,顶板破断步距也相应减小,但如果间距过小又会导致切顶巷之间应力集中,经综合分析,得出切顶巷理想间距为15～30 m。
Based on the analysis of stress changes and roof and floor movements during the working face excavation based on similar simulation tests, it is concluded that mining on the working face may lead to the occurrence of mine earthquakes above 50 m. The stress concentration in the area of 10 m ahead of the working face is drastic Increase; due to the weakening effect of top roadway, so that the length of mined-out area decreases, effectively reducing the front of the coal stress; with the roof spacing to reduce the roof breaking step is also reduced accordingly, but if the distance too Small and will lead to stress concentration between the top roadway, after a comprehensive analysis, the optimal spacing of the top roadway is 15 ~ 30m.