岩石三轴蠕变试验黏弹性解析及参数识别

基于岩石三轴蠕变试验，推导了相应的黏弹性解析解，并对三参量H-K流变模型给出了黏弹性解析解的显式以及流变参数的识别方法. 在此基础上，针对花岗岩及片岩两种岩石的室内蠕变分级加载试验曲线进行了流变参数的识别与反演. 分析表明，同一岩样在不同加载级别下的弹性及黏弹性参数在量值上均有所不同，其中黏弹性模量和黏滞系数的量值随载荷的增加出现损伤衰减，基于试验反演所获参数的解析蠕变曲线与试验蠕变曲线吻合较好.

VISCOELASTIC ANALYSIS AND PARAMETER IDENTIFICATION OF TRIAXIAL CREEP EXPERIMENT OF ROCK

Based on the triaxial creep experiment of rock, the viscoelastic analytical solutions are obtained and aviscoelastic parameter identification method is proposed according to thethree-parameter H-K model. The viscoelastic parameter identification andback analysis are carried out by using the multi-stage loading creep curvesof granite and schist. The results of analysis show that the elasticparameters and viscoelastic parameters of the same sample change withdifferent step loading, in particular, there is a damage attenuation ofviscoelastic modulus and viscosity coefficient with loading. The obtainedanalytical curves using the back-analysis parameters agree with theexperimental creep curves very well.