基于车辆地面力学沙漠沙结构性本构模型的建立

结合沙漠土壤的三轴试验资料,将岩土力学研究中描述土结构性的定量参数(应变综合结构势)引入土的强度变形特性分析. 根据该参数对同一围压下不同含水率沙的应力-应变曲线具有较好的归一化作用,用类似邓肯-张模型的处理方法构造沙漠沙结构性本构模型,并提出获得模型参数的试验方法. 试验与仿真结果表明该结构模型能较好反映不同含水率下沙漠沙的应力-应变关系. 

Soil Structural Model for Describing Constitutive Relationship of Desert Sand Under Moving Vehicle

The soil structural quantitative parameter (strain comprehensive structure potential) was introduced into the analysis of soil strength and deformation characteristics. Under the same confining pressure, the stress-strain curves of sand with different water content were in a stripe region. Using the similar method of setting up the Duncan-Chang model, structural constitutive model of sand was constructed and the parameters of the model were obtained by testing. Results of calculation and test show that the constructed structural constitutive model could better reflect the relationship of stress and strain of sand under different water contents.