Abstract：The stress-strain curves of rocks are composed of two parts，which are pre-peak region and post-peak region. In the pre-peak region of stress-strain curve，rocks are usually regarded as elastomer. At this stage，the constitutive relationship is linearly elastic. However，in the post-peak region，the curve could not be determined by classical theory because the fracture morphology and the stress drop of the rocks are hard to describe. Thus，the post-peak modulus is the key of the mechanical behavior research. Based on Mohr-Coulomb criterion，the paper uses internal friction angle as intermediate variable to propose post-peak elastic modulus. The nonlinear post-peak stress-strain relationship of rock is established. In numerical cases，the stress-strain curves under different confining pressures are obtained and they agree well with the test data. It is concluded that the fitting curve model proposed by this paper is reasonable and the model could describe the post-peak mechanical behavior of marbles under various confining pressures preferably.
李文婷，李树忱，冯现大，李术才，袁 超. 基于莫尔–库仑准则的岩石峰后应变软化力学行为研究[J]. 岩石力学与工程学报, 2011, 30(7): 1460-1466.
LI Wenting，LI Shuchen，FENG Xianda，LI Shucai，YUAN Chao. STUDY OF POST-PEAK STRAIN SOFTENING MECHANICAL PROPERTIES OF ROCK BASED ON MOHR-COULOMB CRITERION. , 2011, 30(7): 1460-1466.
蒋明镜，沈珠江. 考虑剪胀的线性软化柱形孔扩张问题[J]. 岩石力学与工程学报，1997，16(6)：550-557.(JIANG Mingjing，SHEN Zhujiang. On expansion of cylindrical cavity with linear softening and shear dilatation behavior[J]. Chinese Journal of Rock Mechanics and Engineering，1997，16(6)：550-557.(in Chinese))
[13]
张春会，赵全胜，黄 鹂，等. 考虑围压影响的岩石峰后应变软化力学模型[J]. 岩土力学，2010，31(增2)：193-197.(ZHANG Chunhui，ZHAO Quansheng，HUANG Li，et al．Post-peak strain softening mechanical of rock considering confining pressure effect[J]. Rock and Soil Mechanics，2010，31(Supp.2)：193-197.(in Chinese))
<body>Your browse does not support frame!</body>
2011, Vol. 30 
