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Ground subsidence induced by pillar deterioration in abandoned mine districts

Journal of Central South University 2020年第7期27卷 2160-2172页

作者： LUO Rong LI Guang-yue CHEN Lu YANG Qi-yi ZANG Chuan-wei CAO Wen-zhuo School of Resources Environment and Safety Engineering University of South ChinaHengyang 421001China School of Civil Engineering Changsha University of Science&TechnologyChangsha 410114China Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road and Traffic Safety of Ministry of Education Changsha University of Science&TechnologyChangsha 410114China Key Laboratory of Mining Disaster Prevention and Control Qingdao 266590China Department of Earth Science and Engineering Royal School of MinesImperial CollegeLondon SW72AZUK

When roadways are constructed above or adjacent to heavily mined regions, the ground subsidence caused by pillar collapse inflicts severe damage on these roadways. In this study, some surface subsidence events were first reviewed to present roof caving characteristics caused by pillar failure. The bearing characteristic and failure pattern of a single pillar with or without effect of discontinuity were further numerically simulated using distinct element code(3 DEC). It was found that the spalling of pillar or slippage of discontinuity would damage the bearing capacity of pillar during the failure process. The stress at the pillar core could be greater than uniaxial compressive strength of the pillar. However, when a discontinuity runs through a pillar, the slippage of discontinuity would significantly degrade the bearing capacity of the pillar. In pillar support system, if any pillar unexpectedly degrades or loses its bearing capacity, the load transferred from the degraded pillar acts on neighboring pillars, and the shear force also increases at relevant positions. However, the roof cutting and surface subsidence characteristics would perform in different patterns. In some cases, surface subsides slowly;in the worst scenario, shock bump may be induced by pillar and roof collapse.

关键词： subsidence deteriorating pillar failure process roof cutting

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