摘要
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。
Based on Perzyna抯 fundamental assumptions of the elastic viscopalstic theory, a viscoplastic flow rule, and Yin and Grahams 3-D elastic viscopalstic constitutive model (3-D EVP model), the formulation under a triaxial stress state is obtained. Yin and Grahams model proposed new concepts such as 揺quivalent time? 搃nstant time line? 搑eference time line?and 搇imit 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.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2004年第3期337-341,共5页
Rock and Soil Mechanics
基金
国家自然科学基金资助项目(编号:50379043)
中国科学院武汉岩土力学研究所岩土力学重点实验室基金项目(编号:Z110302)。
关键词
软岩
本构关系
等效时间
应变软化
固结不排水三轴试验
时间相关性
soft rock
constitutive relation
equivalent time
strain softening
consolidated-undrained triaxial test
time-dependent
