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| QUANTITATIVE ANALYSIS ON DEVELOPMENT OF SURFACE CRACKS OF ROCKS UPON SHEAR FAILURE |
| CHENG Lichao1，2，XU Jiang1，FENG Dan1，TIAN Aoxue1，LIU Yixin1 |
(1. State Key Laboratory for Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400044，China；
2. School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan 454000，China) |
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Abstract In order to investigate the development of surface cracks and the intrinsic link between the surface cracks and the internal rupture in the process of rock failure，the developmental characteristics of surface cracks of rock during shear failure were quantitatively analyzed and relationships among the parameters describing the surface cracks，the stress state and the acoustic emission characteristics were established. Meanwhile，effects of water content on the parameters describing surface cracks upon shear failure were investigated. The results revealed that the echelon cracks accompanied with the formation and transfixion of surface cracks during shearing process and appeared for a very short period just before rock failure，then shear cracks penetrated through completely. The maximum rate of AE event appeared always for a very short period before the sharp drop of shear stress，and before the occurrence of the non-stable state of rapid propagation of surface cracks. The coefficient of saturation was found to affect the time and the position of occurrence of surface cracks relative to the peak shear stress. As the coefficient of saturation increased，the surface cracks occurred earlier，the maximum instantaneous transfixion velocity decreased，the transfixion time was longer and the time delay of the rapid propagation of surface cracks increased significantly.
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Received: 17 January 2014
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2015, Vol. 34 
