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金属矿山不同采矿水平下的岩体变形规律分析,能为矿山地表移动沉陷范围的圈定及安全生产决策提供依据。以湖北鄂州程潮铁矿西区为例,依据近8 a监测所得的地表及深部岩体变形成果,对不同采矿水平下的岩体变形规律进行分析。结果表明:开采-290,-307.5和-325水平时,顶板岩体进入初始冒落阶段;开采-342.5水平时,顶板岩体进入了大量冒落阶段,其崩落是间断发生的;开采-358水平时,地面沉降漏斗均匀扩展,岩层移动表现出很强的连续性;开采-375水平时,围岩进入快速向外扩展阶段,边界线、移动线得到了较大的扩展,下盘沉降漏斗在2010年1月之后变为不均匀扩展,岩层移动出现了突变性;开采-395水平时,围岩进入扩展放缓阶段,边界线、移动线基本未向外扩展,下盘沉陷坑区域变形仍旧非常剧烈,没有减缓的趋势。
The analysis of rock mass deformation under different mining levels of metal mines can provide basis for delineation and safety production decision of the range of mine subsidence. Taking the western part of Chengchao Iron Mine in Ezhou, Hubei Province as an example, the deformation laws of rock mass under different mining levels are analyzed based on the monitoring results of surface deformation and deep rock mass deformation in recent 8 years. The results show that when the level of -290, -307.5 and -325 is mined, the roof rock mass enters the initial stage of falling; when mining -342.5 level, the roof rock mass enters a large number of caving stages and the caving occurs intermittently; At the horizontal level, the ground subsidence funnel expands uniformly and the rock movement shows a strong continuity. When the level of -375 is exploited, the surrounding rock enters the rapid expansion stage, and the boundary line and the moving line have been greatly expanded. The wall subsidence funnel After January 2010, it became inhomogeneous expansion, and there was a sudden change in rock movement. When the level of mining was -395, the surrounding rock entered an expansion-slowing phase. Boundary lines and moving lines basically did not expand outward, and the deformation of the subsidence depression area Still very intense, there is no slowing trend.