An incremental stress-strain relationship was developed based on the incremental elastoplastic bounding surface theory. This relationship could describe the degradation of saturated clay subjected to cyclic loads. In the relationship, a rotational hardening rule based on a rigorous theory was used to describe the change in size and location of the bounding surface during the action of vibrational stress. The plastic accumulative deviatoric strain length was used as a state parameter to reflect the effect of vibration stress history on the stress-strain response of saturated clay. An interpolated relationship of plastic modulus associated with the state parameter was formulated to describe the cyclic degradation of soft clay subjected to cyclic loads. Finally, the incremental stress-strain relationship was established using the associative flow rule. The relationship included nine parameters, five of which were modified Cambridge model parameters, while four had relatively clear physical meanings. Monotonic and cyclic undrained triaxial test results of two kinds of saturated clay were predicted using the relationship to verify its validity. Comparison of predicted and test results showed that the relationship can skillfully describe the cyclic degradation behavior of saturated soft clay subjected to cyclic loading.
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王建华,杨召焕.饱和黏土振动弱化性态的边界面模型分析[J].地震工程学报,2020,42(1):168-174. WANG Jianhua, YANG Zhaohuan. Cyclic Degradation of Saturated Clay Based ona Bounding Surface Model[J]. China Earthquake Engineering Journal,2020,42(1):168-174.