Chambishi铜矿卸压崩落法下分段穿脉稳定性研究  

Study on the lower roadway stability under caving method in Chamibishi Copper Mine

作　　者：张晋军[1,2] 陈志敏[1,2] 

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083 [2]中色非洲矿业有限责任公司谦比希铜矿,赞比亚基特韦22592

出　　处：《中国矿山工程》2014年第5期9-10,26,共3页China Mine Engineering

基　　金：国家自然科学基金项目(50934002;51104011;51074013);长江学者和创新团队发展计划资助项目(IRT0950);低品位难处理黄金资源综合利用重点实验室开放基金

摘　　要：研究了Chambishi铜矿分段卸压崩落法回采过程对下分段穿脉稳定性的影响。穿脉位于上分段采场投影的中部。在巷道顶板中部和两帮距底板1.2m处布置11排监测点,利用收敛计监测采动过程中的巷道顶板和两帮围岩变形情况。监测时间约7个月（回采前3个月,回采2个月,回采后2个月）监测结果显示采动影响范围包括：距离矿体下盘8~18m为应力降低区,18~25m为主要承压区,25m以外为非采动影响区;在回采过程中,开采初期25~35d为主要采动扰动期,45~60d为岩体变形较大期。The influence of mining excavation on the lower sublevel across-cut roadway stability in sublevel caving with pressure-relieving in Chamibishi Copper Mine was studied. The across-cut roadway was located at the middle of the projection of upper sublevel workings. There were 11 rows measuring points on the roadway roof center and both side with the height of 1.2m. The deformation of roof and wall during mining process was monitored by the convergence gauge. The measuring time was about 7 months （3 months before mining, 2 months during mining, and 2 months after mining）. The results shown that the influence area caused by mining were the stress decreasing zone which 8 - 18m away from the orebody footwall, the main stress-bearing zone which 18 - 25m away, and the no influence area which 25m away from the orebody footwall. During the mining production, the initial 25 -35d was the main influence period of mining, the 45 - 60d was the large deformation period of rock mass.

关 键 词：分段卸压崩落法 采动影响 巷道变形 

分 类 号：TD322.4[矿业工程—矿井建设]