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。
There were differences between real boundary and blast hole controlling boundary of irregular mined-out area in underground metal mines. There were errors in numerical analysis of stability for goaf, if it was analyzed as regular 3D mined-out area and the influence of coupling stress-seepage-disturbance was not considered adequately. Taking a lead zinc mine as the background, the model was built by the coupling of Surpac and Midas-Gts based on the goaf model precisely measured by CMS.According to seepage stress fundamental equations based on the equivalent continuum mechanical and the theory about equivalent load of dynamic disturbance in deep-hole blasting, the stability of mined-out area under multi-field coupling of stress-seepage-dynamic disturbance was numerically analyzed. The results show that it is more consistent between the numerical analysis model based on the real model of irregular 3D shape goaf and the real situation, which could faithfully reappear the change rule of stress–strain about the surrounding rock under synthetic action of blasting dynamic loading and the seepage pressure. The mined-out area multi-field coupling formed by blasting excavation is stable. Based on combination of the advantages of the CMS,Surpac and Midas-Gts, and fully consideration of the effects of multi-field coupling, the accurate and effective way could be provided for numerical analysis of stability for mined-out area.
