Analysis on slope deformation and aging stability induced by different mining conditions

doi:10.16265/j.cnki.issn1003-3033.2022.S1.0003

Abstract

Abstract:

In order to solve the problem of slope instability in open-pit end mining, this paper establishes slope structure models under different mining conditions through similarity simulation and numerical simulation methods, and combines the radar monitoring system to analyze the relationship between the original rock structure, stability deterioration and aging stability of slope under different mining conditions. The results show that the process of open-pit mining can be divided into three stages: the initial stage of mining, the middle stage of mining and the end of mining. The slope has local deformation and failure phenomenon until the end of mining, and the stability is good. The upper coal mining of the end wall can be divided into three stages: supergene transformation, structural transformation and aging deformation. In the supergene transformation stage, the slope's rock mass deforms around the goaf and does not disturb the slope. In the stage of structural transformation, cantilever beam and fixedly supported beam structures will be formed, and the two structures will change alternately, so that the failure zone above the roof will expand to the upper part of the slope rock mass in a semi-butterfly shape. In the aging deformation stage, the deformation and failure of the slope supported by the caved rock mass do not extend upward continuously, but there are vertical cracks extending, the slope stability is good, and the final deformation and failure are pyramid-shaped. The upper and lower goaf are connected by the coal seam mining under the end wall, and the slope is unstable toward the goaf. The aging deformation of the slope after open mining can be divided into three stages, the initial stage is slow, the middle stage is accelerated, and the late stage is stable. The aging deformation of the slope after coal seam mining on the end wall can be divided into two stages, namely, the accelerated movement stage and the steady movement stage.

Key words: open-pit mining, mining condition, slope deformation, aging stability, numerical simulation

WANG Wencai, LI Junpeng, WANG Chuangye, CHEN Shijiang, WANG Peng, LI Shizhang. Analysis on slope deformation and aging stability induced by different mining conditions[J]. China Safety Science Journal, 2022, 32(S1): 72-78.

Figures/Tables 11

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