【摘要】 在对华锡集团铜坑矿隐患空区现场实测的基础上,采用隐患空区三维信息获取方法准确获取空区的位置形态、体积、顶板面积及边界等信息。结合92号矿体周边采场分布特点,选取205-2,203-2,201-2和202-2这4条勘探线上的隐患空区为研究对象,在分析其空间特征信息的基础上,分别结合国际矿业软件Surpac与岩石破裂过程分析软件RFPA(rock failure process analysis)软件构建这4条勘探线上隐患空区数值计算模型,综合考虑矿区初始应力场和空区周边爆破动力扰动作用的影响,运用RFPA开展隐患空区动力失稳过程模拟仿真,模拟空区从形成到动力扰动作用下破坏过程的裂纹扩展规律。研究结果表明:动力扰动使空区应力集中加强,并加速空区裂纹扩展,尤其对间柱产生强烈冲击,致使裂纹贯通,矿柱破坏;该研究成果可为我国大范围隐患空区灾害预测和控制提供技术支持。更多还原

【Abstract】 On the basis of the field measurement of disaster cavities in Tongkeng Mine of ChinaTin Group,the location,shape,size,roof area and boundary information of the cavities were accurately obtained by using disaster cavity 3D information acquisition method.Combined with the stope distribution characteristics surrounding No.92 orebody,disaster cavities within four exploration lines,i.e.,205-2,203-2,201-2 and 202-2,were taken as research objects.On the basis of analyzing the information of the spatial characteristics,numerical calculation model of disaster cavities within four exploration lines was built with international mining software Surpac and rock failure process analysis software RFPA software respectively.Initial field stress and blasting dynamic disturbances effect surrounding the cavities were comprehensively considered.Dynamical destabilization of disaster cavities was simulated by using RFPA.Crack propagation behaviors during the process from the formation to failure of the cavities in the dynamic disturbance role were simulated.The results show that the dynamic disturbance reinforces cavities stress concentration and accelerates cavities crack propagation,especially produces strong impact to ore pillar,which causes the crack through and leads to pillar failure.The research can provide technical support for disaster prediction and control of a wide range of cavities.更多还原