急倾斜厚大金属矿山地下开挖岩移发生机理  

Mechanism of ground movement induced by underground mining of metal deposit with steep occurrence and large thickness

作　　者：袁仁茂[1] 马凤山[1] 邓清海[1] 高建科 卢耀军 

机构地区：[1]中国科学院地质与地球物理研究所 [2]金川集团有限公司二矿区,甘肃金昌737100

出　　处：《中国地质灾害与防治学报》2008年第1期62-67,共6页The Chinese Journal of Geological Hazard and Control

基　　金：国家重点基础研究发展规划(973)项目(2002CB412702);国家自然科学基金项目(40702048);中国科学院知识创新工程重要方向性项目(KZCX2-YW-113)

摘　　要：文章以金川二矿区的岩体移动为例,对急倾斜厚大金属矿山的岩体移动这一重大工程难题进行了探讨。分析了急倾斜金属矿山开挖引起岩体移动的概化传递模式及其地表岩移显现特征。结合数值模拟及GPS监测分析结果,对厚大急倾斜金属矿山岩移发生机理进行研究。结果表明,急倾斜金属矿的厚度对地表岩移的显现特征具明显的影响。当对厚大矿体进行薄层开采时,较大幅度的岩体移动主要发生在采空区顶、底板,开采引起岩体移动的地表显现特征类似于水平矿体的开采;而当采空区的高度大于整个矿体的厚度时,采空区两侧的岩体位移逐渐增大到占主导地位。岩体移动的地表显现特征开始表现为急倾斜矿体开挖的岩体移动特征。Ground movement is always a major engineering puzzle in the metal mining area. A case of ground movement induced by underground mining of steep metal deposit with large thickness, at a locality of Jinchuan Nickel Mine area, Gansu Province, China, is presented for mechanical analysis. At first, the ground surface characters and general transmission models of ground movement were discussed, then the mechanics of ground movement was studied based on the results of GPS monitoring and numerical simulation. The results stated that the ground surface characters were influenced obviously by the thickness of metal deposit. At the early stage, the model of ground movement likes that induced by excavating gently inclined coal seam, but when the exploiting depth is enough large, namely larger than the thickness of the ore body, the model of ground movement likes that induced by excavating steep inclined deposit. The mechanic changes in different mining stage, the change point is about where the height of goaf is larger than the thickness of orebody. The second subsidence centre is retarded because of the large thickness orebody in Jinchan Mine area.

关 键 词：岩体移动 发生机理 急倾斜厚大金属矿 金川镍矿 采空区 

分 类 号：TU413.9[建筑科学—岩土工程]