近距离跨采巷道预加固技术研究  

Study on pre-reinforcement technology of roadway affected by contugous overhead mining

作　　者：许帮贵[1] 王凯 XU Banggui;WANG Kai(Huaibei Mining(Group)Co.,Lud.,Huaibei 235000,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221008,China)

机构地区：[1]淮北矿业(集团)有限责任公司,安徽淮北235000 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008

出　　处：《煤炭科学技术》2020年第4期194-199,共6页Coal Science and Technology

摘　　要：近距离跨采巷道在受到原岩应力和超前动压的共同作用下,维护变得十分困难。针对近距离跨采巷道围岩控制难题,以桃园煤矿Ⅱ4采区运输上山为研究背景,通过理论分析上覆1042工作面回采时跨采巷道的采动支承压力分布规律,提出了针对性的巷道预加固技术。研究结果表明:随着上覆工作面的推进,在工作面前方底板形成应力增高区,在采空区下方形成应力降低区。由上覆工作面回采引起的垂直应力峰值随着埋深的增加逐渐远离工作面,且应力集中系数随着埋深的增加逐渐减小。沿工作面推进方向的水平应力集中程度远小于垂直应力的集中程度,且受上覆工作面回采引起的水平应力对跨采巷道围岩稳定性的影响较小。当上覆工作面推进至距离跨采巷道50 m时,跨采巷道开始受到超前动压影响;当上覆工作面推进至距离跨采巷道15 m时,垂直应力峰值位于跨采巷道的正上方,此时跨采巷道受超前动压影响最大。采用注浆锚索加底板注浆对巷道底板和围岩深部进行预加固支护,通过预加固能够有效地控制跨采巷道的围岩变形,实现了煤矿的安全高效生产。Under the combined action of the in-situ stress and advanced dynamic pressure,the maintenance of contugous roadway affected by overhead mining becomes very difficult. Aiming at the difficulty of controlling the surrounding rock of the contugous roadway affected by overhead mining,this paper takes the haulage rise-entry of No. Ⅱ 4 mining area in Taoyuan Coal Mine as the research background.Through the theoretical analysis of the distribution law,the mining support pressure distribution law and surrounding rock deformation and failure characteristics of the cross mining roadway during the overlying No.1042 work face mining were obtained,and the targeted roadway pre-reinforcement technology was proposed.The research results show that with the advancement of the overlying working face,a stress-increasing area is formed on the floor of the working face and a stress-reducing area is formed below the gob. The vertical stress peak caused by the mining of the overlying working face is gradually away from the working face as the burial depth increases,and the stress concentration coefficient also gradually decreases as the burial depth increases. The horizontal stress concentration along the advancing direction of the working face is much smaller than the vertical stress concentration,and the horizontal stress caused by the mining of the overlying working face has less influence on the stability of the surrounding rock of the roadway affected by overhead mining.When the overlying face is advanced to a distance of 50 m from the roadway affected by overhead mining,it will be affected by the advanced dynamic pressure.When the overlying working face is advanced to a distance of 15 m from the cross mining roadway,the peak value of vertical stress is located directly above the roadway affected by overhead mining. At this time,the roadway affected by overhead mining is most affected by the advanced dynamic pressure. Therefore,it is decided to use grouting anchor cable and floor grouting to pre-reinforce the support of the surro

关 键 词：近距离巷道 跨采巷道 预加固技术 超前动压 

分 类 号：TD322[矿业工程—矿井建设]