深井上山巷道底板动载诱发冲击矿压控制技术

摘要

为了防治深井上山巷道底板动载诱发的冲击矿压,采用FLAC2D数值模拟软件及微震监测系统进行控制技术研究,结果表明:静载作用下上山底板水平应力、垂直位移及塑性区深度分别为38.27 MPa、156.38 mm、4 m,动载扰动下底板冲击响应特征分别增加8.96 MPa、266.92 mm、2 m,冲击危险性急剧升高;动力扰动使处于极限条件下的上山煤柱区应力增加打破平衡状态而发生底板冲击矿压,即高静载主导—强动载诱发的动静载叠加诱冲机理;现场微震监测验证了数值模拟结果的合理性;针对深井上山底板冲击矿压特点提出合理布置巷道、采取局部措施、降低动载荷传递、避让法等4种针对性的动力灾害控制措施.%In order to prevent the mine pressure bump occurred by the floor dynamic loading in the rise gateways of the deep mine,a FLAC2D numerical simulation software and the microseism monitoring and measuring system were applied to the study on the control technology.The study results showed that under the role of the static load,the floor horizontal stress of the rise gateway,vertical displacement and plastic zone depth would be 38.27 MPa,156.38 mm and 4 m individually and under the dynamic load disturbances,the floor bump response features were increased by 8.96 MPa,266.92 mm and 2 m individually and the bump danger was steeply increased.The dynamic disturbances could make the stress increased of the coal pillars in the rise gateways under the limit condition and then could break the balance state of the coal pillar and make the floor pressure bump occurred.Thus those would be the dynamic static load stacked induced pressure bump mechanism with the high static load-strong dynamic load induction.The site microseism monitoring and measuring verified the rationality of the numerical simulation results.According to floor pressure bump features of the rise and dip gateways in the deep mine,the rational layout gateway was provided.With the local measures,the dynamic load transmission could be reduced and there were four avoidances for the dynamic disaster control measures.