【摘要】 采用不同路径下砂土的三轴拉伸和三轴压缩试验结果,分别选用塑性体积应变、塑性剪应变、清华模型硬化参数、塑性功和统一硬化参数H作为硬化参数,在以上硬化参数和应力比空间里探讨了砂土的硬化规律和应力路径相关性.基于修正剑桥模型的屈服函数,采用塑性体积应变、塑性功和H作为硬化参数,推导了分别对应的本构模型.通过饱和塔克拉玛干沙漠砂的三轴试验结果,表明了H在描述砂土应力应变特性上的适用性.更多还原

【Abstract】 According to the test data of sand with different stress paths in the triaxial compression and triaxial extension condition,plastic volumetric strain,plastic shear strain,hardening parameter of Tsinghua model,plastic work and unified hardening parameter H were chosen as hardening parameter respectively,and then the hardening rules as well as the independence on the stress paths of above hardening parameters were discussed.Based on the yield function of modified cam-clay model,constitutive models which used plastic volumetric strain,plastic work and unified hardening parameter H respectively as hardening parameter were proposed.The validity of unified hardening parameter H on describing the stress-strain properties of sands was confirmed by the triaxial test data of saturated sand from Taklamakan desert.更多还原