基于亚塑性理论的无粘性土压缩试验应力应变的研究

Studies on stress-strain equation of noncohesive soils obtained from oedometer tests based on hypoplastic constitutive model

摘要: 根据亚塑性理论推导出了颗粒体材料压缩试验的应力应变方程,研究了亚塑性本构模型中颗粒硬度hs和指数n的实验确定方法,并且指明其不足之处。根据亚塑性理论和优化方法,提出了用局部搜索最优解来确定hs和n的方法。结果表明,文中方程可以用来确定压缩试验的应力应变关系。

Abstract: According to the hypoplastic constitutive model,the stress-strain equation of granular materials could be obtained from oedometer test.The determination of granulate hardness hs and exponent n in a hypoplastic constitutive model was investigated,and a hypoplastic constitutive model was presented based on hypoplasticity.According to hypoplasticity and optimization,the authors put forward an improved method to determine the parameters of n and hs using iterative operation.The further investigation of the equation showed that it could be used to determine stress-strain relation in oedometer test.