煤矿地下采空区沉陷诱发边坡破坏机制研究

doi:10.3724/1000-6915.jrme.2024.0671

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Abstract The underground mine workings induce movements in the overlying rock layers and alter stress fields, leading to the deterioration of rock properties in slopes, which can easily result in disasters such as slope landslides. This study compares the failure process of the underground mine-slope system under various underground mining conditions through bottom friction tests and numerical simulations. Consequently, the failure modes and deformation mechanisms of the slope influenced by underground coal mining subsidence were analyzed. The findings are as follows: (1) The effects of underground coal mining subsidence on slopes primarily include a reduction in the integrity and strength of the slope rock mass, a change in the inclination angle of the slope rock layer, an enhancement of the tensile effects on the slope surface resulting in cracking, and a modification of the geometric shape of the slope. (2) The fracture mechanism of the overlying rock strata involves the gradual bending and collapse of the strata towards the underground mine workings due to gravitational forces. The fracture surface of the rock strata develops in a geese-like pattern, with the centerline of the underground mine workings serving as the axis of symmetry in the deeper field, and is connected to the tensile fractures on the slope surface in the near-slope field. (3) The mechanisms of slope failure induced by underground mine workings can be categorized into two types: compression-type and traction-type. Compression-type slope failure typically occurs in the lower slope of mining subsidence, and the process can be divided into stages such as overlying rock collapse, subsidence compression, and slope sliding. Conversely, traction-type slope failure usually occurs on the upper slope of mining subsidence, with the process divided into stages including the collapse of overlying rock strata, traction and tearing, and slope sliding. (4) The geological structure significantly influences the instability and failure processes of the overlying slope. When the rock layers of the slope are oriented in a bedding fashion, the fracture surface patterns on both sides of the overlying rock layer rotate towards the dip direction, resulting in a relatively large deformation and failure range of the slope induced by mining subsidence. In contrast, when the rock strata are in a reverse inclined orientation, the effect of underground mine workings at the same position and burial depth on the slope displacement is significantly reduced. The research results provide valuable insights for identifying slope disasters in coal mining subsidence areas and for ensuring safety in open-pit to underground mining transition projects.

Key words： mining engineering underground coal mine workings open-pit-underground mining transition slope failure base friction test numerical simulation

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	Articles by authors
	SUN Shuwei1
	YANG Zhaoxi1
	JIA Peizhi1
	WANG Xiaolong1
	LI Guojun2

Cite this article:

SUN Shuwei1,YANG Zhaoxi1,JIA Peizhi1, et al. Study on failure mechanism of slopes induced by the underground coal mining subsidence[J]. , 2025, 44(6): 1405-1419.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0671 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I6/1405

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