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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 7    July 2020

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Ground subsidence induced by pillar deterioration in abandoned mine districts
LUO Rong(罗容)1, 2, LI Guang-yue(李广悦)1, CHEN Lu(陈璐)2, 3, YANG Qi-yi(杨琪毅)2, ZANG Chuan-wei(臧传伟)4, CAO Wen-zhuo(曹文卓)5

1. School of Resources Environment and Safety Engineering, University of South China,Hengyang 421001, China;
2. School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China;
3. Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road and Traffic Safety of Ministry of Education, Changsha University of Science & Technology, Changsha 410114, China;
4. Key Laboratory of Mining Disaster Prevention and Control, Qingdao 266590, China;
5. Department of Earth Science and Engineering, Royal School of Mines, Imperial College,
London SW72AZ, UK

Abstract: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 (3DEC). 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.

 

Key words: subsidence; deteriorating pillar; failure process; roof cutting

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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