摘要
为掌握在采空区上方开发地下空间时,地下空间开挖对采空区覆岩移动变形的影响情况,以山西拟开发的跨越南坑矿8#煤层部分采空区的某大型地下空间工程为研究对象,采用数值模拟方法研究分析开挖对采空区覆岩的移动变形影响,发现控制层及其稳定性在开挖过程中对地下空间工程的稳定性起着至关重要的作用。开始开挖时控制层在应力作用下纵向下移,在开挖面经过采空区一段时间后停止移动,而非控制层在应力作用下继续移动,导致离层;开挖过程中采空区覆岩横向不同程度的错动,总体趋势是两侧岩层向中间移动;控制层的稳定性对岩层的移动变形有重要作用,控制层稳定存在时,其上部岩层不会产生向下的大变形,否则相反。为进一步开发研究地下空间开挖过采空区时的岩层控制技术提供了理论基础。
The influence of the excavation above goaf on the displacement of rock cover is analyzed by means of numerical simulation method,with the excavation of a large underground space through the goaf of No.8 coal seam of Nankeng Mine in Shanxi province as an example.The study shows that the control layer and its stability play an important role in maintaining the stability of the underground space during excavation.The control layer moves in the longitudinal direction under the action of stress,and it stops moving some time after the excavation face passes the goaf.Discrete layer is formed due to the continuous movement of the non-control layers.The deformation of the rock cover on both wings above the goaf moves towards the center.The stability of the control layer plays a very important role in the deformation of the rock cover.The paper can provide theoretical basis for the further study on the rock layer control technology in the excavation of underground space above goafs.
出处
《隧道建设》
2011年第4期453-456,462,共5页
Tunnel Construction
基金
国家科技支撑计划资助项目子课题项目(2009BAB48B02)
山西省高等学校优秀青年学术带头人支持计划项目(20100202)
山西省科技攻关(工业)项目(20110321015-03)
关键词
地下空间
开挖
采空区
覆盖移动变形
数值模拟
underground space
excavation
goaf
rock cover
deformation
numerical simulation
