基于监测数据的陡倾结构金属矿山下盘岩层移动机制研究

doi:10.13722/j.cnki.jrme.2021.0860

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摘要为了解决陡倾结构金属矿山地下采矿引起的地压显现、地表塌陷和建构筑物损坏等问题，以金山店东区下盘为研究背景，首先根据地下、地表现场破坏调查与监测数据得出岩层移动基本规律，然后结合地质条件，通过理论分析研究岩层移动机制。地下采空区附近靠近F1断层处巷道出现地压现象，原因是采矿引起的F1断层滑移。地表变形从开采至今经历了3次加速阶段，加速变形点与采矿进度、陡倾结构引起的地表塌陷与地下巷道破坏的时间吻合。陡倾结构岩体的变形破坏是由深部逐渐传递到地表，导致地表移动和建构筑物开裂。下盘采空区附近围岩分析模型简化为悬臂梁模型，得到围岩破坏的机制为开采诱发F1断层滑移引起陡倾结构岩柱弯曲倾倒破坏，各柱体破坏贯通并沿着破坏面滑移。陡倾结构面是引起下盘岩层大规模移动的主要原因，这种特殊的岩层移动机制导致监测所得的移动角明显小于设计的移动角。

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	王田龙1
	2
	陈从新1
	2
	夏开宗1
	2
	邵勇1
	2
	刘轩廷1
	2
	刘子航1
	杨括宇3

关键词 ：采矿工程, 金属矿山, 陡倾结构, 监测数据, 地下开采, 岩层移动

Abstract：In order to solve problems of ground pressure，surface collapse and buildings and structures damage caused by underground mining in metal mines with steeply dipping discontinuities，the footwall of the Jinshandian east area was taken as the research case and the basic law of ground movement was obtained first based on the in-situ failure investigation and monitoring data of underground and surface. Combined with geological conditions and theoretical analysis，the mechanism of ground movement was studied. Ground pressure appears in the roadway near the underground goaf and the F1 fault，which is mainly due to the sliding of the F1 fault caused by mining activities. The surface deformation of the footwall has experienced three accelerated stages since mining，and the accelerated deformation point coincides with the time of mining activities，surface collapse and underground roadway failure caused by steeply dipping discontinuities. It is obtained that the deformation and failure of the steeply dipping discontinuities rock mass is gradually transferred from the deep to the ground surface，which caused the movement of the ground surface and crack of buildings and structures. A ground movement mechanism analysis model of the footwall rock mass around goaf is simplified to the cantilever beam model，in which the rock mass failure is mainly caused by the F1 fault slip induced by mining and in turn causes the flexure toppling failure of the steeply dipping rock column. The failure surfaces of each rock column are connected and slip along the failure plane. The steeply dipping discontinuities are the main reasons for the large-scale ground movement of the footwall，and the special ground movement mechanism causes the monitored movement angle to be significantly smaller than the designed movement angle.

Key words： mining engineering metal mine steeply dipping discontinuities monitoring data underground mining ground movement

引用本文:

王田龙1，2，陈从新1，2，夏开宗1，2，邵勇1，2，刘轩廷1，2，刘子航1，杨括宇3. 基于监测数据的陡倾结构金属矿山下盘岩层移动机制研究[J]. 岩石力学与工程学报, 2022, 41(7): 1409-1426.
WANG Tianlong1，2，CHEN Congxin1，2，XIA Kaizong1，2，SHAO Yong1，2，LIU Xuanting1，2，LIU Zihang1，YANG Kuoyu3. Study of footwall ground movement mechanism in the iron mine with steeply dipping discontinuities based on monitoring data . , 2022, 41(7): 1409-1426.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0860 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I7/1409

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