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| CHARACTERISTICS OF DEFORMATION，FAILURE AND STRAIN ENERGY OF SANDSTONE UNDER CYCLING LOADING IN POST-PEAK |
| GUO Chenye1，2，XIAN Xuefu1，JIANG Yongdong1，WANG Chen1 |
(1. Key Laboratory for Exploitation of Southwest Resources and Environmental Disaster Control Engineering，Ministry of Education，Chongqing University，Chongqing 400030，China；2. Chongqing Energy Investment Group Science and Technology Co.，
Ltd.，Chongqing 400060，China) |
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Abstract In order to understand the characteristics of deformation，failure and strain energy of the fractured rock sample under continuous loading，triaxial compression tests of the sandstone sample from Yongchuan mine are carried out by a MTS815 rock testing system. Based on the experimental results，the fractured ratio(r) is developed，it reflects the ratio of the break between the fractured sample and the perfect sample，smaller r means the larger fracture for the rock sample，the maximum and the minimum value of r is 1 and the ratio of residual strength and peak strength. The results of this analysis showed that the fractured ratio has good linear relationship with the secant modulus，axial strain，Poisson?s ratio and strain energy；after continuous loading，the failure mode of fractured rock sample appears‘X’shear failure mode；the maximum of Poisson?s ratio of rock can be determined by the test under continuous loading. These conclusions have a great significance to understand the mechanism of rock outburst and rockburst.
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Received: 04 September 2010
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2011, Vol. 30 
