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Geomechanics and Engineering Volume 18, Number 1, May20 2019 , pages 21-27 DOI: https://doi.org/10.12989/gae.2019.18.1.021 |
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A stress model reflecting the effect of the friction angle on rockbursts in coal mines |
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Jinyang Fan, Jie Chen, Deyi Jiang, Jianxun Wu, Cai Shu and Wei Liu
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| Abstract | ||
| Rockburst disasters pose serious threat to mining safety and underground excavation, especially in China, resulting in massive life-wealth loss and even compulsive closed-down of some coal mines. To investigate the mechanism of rockbursts that occur under a state of static forces, a stress model with sidewall as prototype was developed and verified by a group of laboratory experiments and numerical simulations. In this model, roadway sidewall was simplified as a square plate with axial compression and end (horizontal) restraints. The stress field was solved via the Airy stress function. To track the \"closeness degree\" of the stress state approaching the yield limit, an unbalanced force F was defined based on the Mohr-Coulomb yield criterion. The distribution of the unbalanced force in the plane model indicated that only the friction angle above a critical value could cause the first failure on the coal in the deeper of the sidewall, inducing the occurrence of rockbursts. The laboratory tests reproduced the rockburst process, which was similar to the prediction from the theoretical model, numerical simulation and some disaster scenes. | ||
| Key Words | ||
| failure; numerical analyses; plasticity; rock; triaxial tests | ||
| Address | ||
| Jinyang Fan: 1.) State Key Laboratory for the Coal Mine Disaster Dynamics and Controls, Chongqing University, 400044 Chongqing, China 2.) Université de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d\'Azur, Géoazur, 250 rue Einstein, 06560 Valbonne, France Jie Chen, Deyi Jiang,Cai Shu and Wei Liu: State Key Laboratory for the Coal Mine Disaster Dynamics and Controls, Chongqing University, 400044 Chongqing, China Jianxun Wu: 1.)State Key Laboratory for the Coal Mine Disaster Dynamics and Controls, Chongqing University, 400044 Chongqing, China 2.) Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, 78712-0273 Austin Texas, U.S.A. | ||