强冲击煤层综采面矿压显现规律及动静载特征研究

Study on Ground Pressure Behavior and Dynamic and Static Load Characteristics of Fully Mechanized Mining Face in Strong Impact Coal Seam

张双楼煤矿7煤为冲击煤层,曾发生过冲击矿压灾害,事故造成多人死亡,而9煤也是冲击煤层,面临着同样的灾害风险,为了预防9煤再次发生同类事故,故以该矿正在回采的94101工作面为工程背景进行现场实测并分析,确定工作面矿压显现规律,结合理论分析得到其顶板运动规律及围岩动静载变化特征,最后运用数值模拟对回采过程中工作面沿走向方向的垂直应力、垂直位移、塑性区分布、能量分布进行模拟分析验证。得出结果表明诱发冲击矿压的原因主要来自于基本顶断裂,为该工作面后续开采或相似地质条件下矿井开采提供有效的参考和技术支持。

Coal No.7 in Zhangshuanglou Coal Mine is an impact coal seam,and there has been a mine pressure disaster,which caused many deaths.Coal No.9 is also an impact coal seam.Through on-site measurement and analysis of the strata pressure manifestation of 94101 working face under mining in this mine,the strata pressure manifestation law of working face is determined.Combining with theoretical analysis,the roof movement law and the dynamic and static load variation characteristics of surrounding rock are obtained.Finally,the vertical stress and vertical stress along the strike direction of working face in the mining process are simulated by numerical simulation.Direct displacement,plastic zone distribution and energy distribution are simulated.Finally,it is concluded that conventional rock pressure monitoring can provide some guidance for the prediction of rock burst,which can provide effective reference and technical support for the follow-up mining of the working face or mine mining under similar geological conditions.