【摘要】 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。更多还原

【Abstract】 The stress change and roof and floor movement of working face during mining is anlyzed based on similar simulation test.Working face mining could lead to mine earthquake in the range of more than 50 m above the face,the stress concentration rapidly increase in ahead of working face of 10 m.Because of weakening action of cutting roof roadway,the length of hanging goaf is reduced,and the coal stress ahead is effective decreased.With the decrease of distance between cutting roof roadways,the roof strata breaking step decreases correspondingly,however the stress would increase with too short distance.The reasonable distance between cutting roof roadways is 15 m to 30 m according to the comprehensive analysis.更多还原