硅藻质软岩的三维弹粘塑性模型分析

基于Perzyna的弹粘塑性理论的基本假设、粘塑性流动法则及殷建华和Graham的三维弹粘塑性模型，得出了在三轴应力状态下的本构关系表达式。殷建华和Graham的模型提出了“等效时间”，“瞬时时间线”，“参考时间线”，“极限时间线”等一系列新的概念。用三轴应力状态下的本构关系表达式对软岩的固结不排水三轴剪切试验进行了模拟计算，并与试验结果进行了比较。结果表明：数值模拟计算结果与试验结果几乎一致。该模型简单、实用、精度较高，可以模拟硅藻质软岩材料与时间有关的应力-应变关系、孔隙水压力与应变的关系，以及有效应力路径等。

3-D elastic viscoplastic modeling analysis of a diatomaceous soft rock

Based on Perzyna’s fundamental assumptions of the elastic viscopalstic theory, a viscoplastic flow rule, and Yin and Graham’s 3-D elastic viscopalstic constitutive model (3-D EVP model), the formulation under a triaxial stress state is obtained. Yin and Graham’s model proposed new concepts such as “equivalent time”, “instant time line”, “reference time line” and “limit time line”. The derived formulation is used to simulate the time-dependent stress-strain behavior of consolidated undrained triaxial tests of a soft rock. The simulated results are compared with the triaxial test results. The comparison of the results shows that agreement between the model predictions and measured results is good. This demonstrates that the EVP model can be used to describe the time-dependent stress-strain behavior of the diatomaceous soft rock.