An improved accelerated creep mechanical model of viscoelasto-plastic rock

作者：Cao Ping^*; Liu Ye Ke; Pu Cheng Zhi; Chen Rui; Wang Yi Xian

来源：Journal of Central South University(Science and Technology), 2011, 42(1): 142-146.

• Accelerated creeps
• Characteristic length
• Long-term strength
• Rheological models
• Visco-elasto-plastic model

In order to depict the process of rock creep comprehensively, and overcome the deficiency of the linear Newton fluid which can not describe accelerated creep accurately, based on the mature rheological model, the nonlinear creep body model was introduced. In this model, the total creep strain before accelerated creep stage was defined as the characteristic length of creep, and the ratio of stress level and long-term strength of rock specimens was defined as accelerated creep rate. The improved rheological mechanics model was established that can describe the viscoelastic-plastic characteristics of accelerated creep. Combined with the uniaxial compression creep test under multi-step incremental cycling loading and unloading on the sandy shale from Dongxiang Copper Mine, the parameter identification of the mechanical model was explained, the experimental creep curve was compared with the creep fitted curve obtained by the model. The results show that the accelerate creep properties of rocks can be described effectively by this improved creep model.

• 出版日期2011
• 单位中南大学