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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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

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	Articles by authors
	WANG Tianlong1
	2
	CHEN Congxin1
	2
	XIA Kaizong1
	2
	SHAO Yong1
	2
	LIU Xuanting1
	2
	LIU Zihang1
	YANG Kuoyu3

Cite this article:

WANG Tianlong1,2,CHEN Congxin1, et al. Study of footwall ground movement mechanism in the iron mine with steeply dipping discontinuities based on monitoring data [J]. , 2022, 41(7): 1409-1426.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0860 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I7/1409

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