摘要
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.
Based on the triaxial creep experiment of rock, the viscoelastic analytical solutions are obtained and a viscoelastic parameter identification method is proposed according to the three-parameter H-K model. The viscoelastic parameter identification and back analysis are carried out by using the multi-stage loading creep curves of granite and schist. The results of analysis show that the elastic parameters and viscoelastic parameters of the same sample change with different step loading, in particular, there is a damage attenuation of viscoelastic modulus and viscosity coefficient with loading. The obtained analytical curves using the backanalysis parameters agree with the experimental creep curves very well.
出处
《力学与实践》
CSCD
北大核心
2008年第4期20-23,43,共5页
Mechanics in Engineering
基金
国家自然科学基金(50774090)．
关键词
岩石
三轴蠕变试验
分级加载
参数识别
rock, triaxial creep test, step loading, parameter identification
