An elasto-plastic constitutive model for soft rock considering mobilization of strength

作者：Li, Hang-zhou^*; Xiong, Guang-dong; Zhao, Gui-ping

来源：Transactions of Nonferrous Metals Society of China, 2016, 26(3): 822-834.

DOI：10.1016/S1003-6326(16)64173-0

• constitutive model
• mobilized strength component
• unified strength theory
• soft rock

A new elasto-plastic constitutive model is presented in the framework of plasticity theory. The strength characteristics of a diatomaceous soft rock is investigated. The friction angle and cohesion of soft rock are mobilized as a function of plastic strain. A hyperbolic hardening function for the mobilized friction and a mixed parabolic and exponential equation for the mobilized cohesion are proposed. In view of the unified strength theory and the mobilizations of strength components, a yield function is given. A plastic potential function is determined by using the non-associated plastic flow rule. An elasto-plastic constitutive model is developed and verified. The results indicate that the proposed model can predict the behavior of soft rock accurately. The advantages of the proposed constitutive model are analyzed. The evidences support that the proposed constitutive model is a mixed hardening/softening model. A hump hardening/softening function for mobilized friction is extended to a more generalized condition.

• 出版日期2016-3
• 单位西安交通大学