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| Strong disturbance of discontinuous abutment pressure |
| XUE Dongjie1，2，3，4，ZHOU Hongwei1，2，PENG Ruidong1，2，WANG Jianqiang1，2，DENG Linsheng1，ZHAO Yongwei1 |
(1. School of Mechanics and Civil Engineering，China University of Mining and Technology，Beijing 100083，China；
2. State Key Laboratory of Coal Resources and Safe Mining，China University of Mining and Technology，Beijing 100083，China；
3. State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400030，China；
4. Key Laboratory of Safety and High-efficiency Coal Mining，Ministry of Education，Anhui
University of Science and Technology，Huainan，Anhui 232001，China)
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Abstract The quantification of disturbances in deep engineering is a prerequisite to re-understand the causes of disasters. The mechanical parameters of Hoek-Brown and Mohr-Coulomb criteria according to the conventional triaxial compression tests are obtained for the coal at a depth of one thousand meter. Based on the Airey?s solution，a discontinuous stress drop is introduced on the elasto-plastic boundary for the study of continuous- discontinuous transition caused by the plastic failure，highlighting the stress drop and the brittleness index assessment of the abutment pressure. The damage based on the internal friction angle or cohesion degradation is defined to illustrate the discontinuities in plastic zones，and is applied to the discontinuous stress distribution in three various mining layouts including the non-pillar mining，top coal mining and protective coal mining. A new brittleness index is proposed considering the coupled influence of the peak stress，the stress drop，the post-peak modulus and the residual plastic strain，corresponding to the combined effect of external stress disturbances，deformation and mechanical parameters. The qualitative analysis of the strong disturbed zone based on the new definition mainly includes the fracture zone，the post-stress unloading zone，the stress drop zone，the damage zone and the elastic zone. Finally，we proposed a new disturbance index based on the various mining layouts of ，the brittleness index ，the stress drop and the in-situ stress field ，and is strong disturbance.
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2018, Vol. 37 
