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分析现有砂土临界状态单屈服面模型存在的缺陷,基于临界状态理论和材料状态相关剪胀性理论,建立了一个适用于不同初始密实度的双屈服面砂土本构模型。该模型考虑了剪切变形和压缩变形机理,克服了单屈服面在一维压缩等试验条件下只有弹性应变没有塑性应变的不足,模型只用一组参数便可描述不同围压不同密实度砂土的应力应变关系,对剪切试验过程中表现出来的剪胀剪缩特性也可以进行很好的追踪。通过对Toyoura砂和Hostun砂一维压缩及三轴排水和不排水条件下的试验结果进行模拟,表明该模型具有较好的预测能力和较广的适用性。
Based on the theory of critical state and the dilatancy theory of material state, a constitutive model of double yield surface sand for different initial densities is established. The model takes into account the shear deformation and compression deformation mechanism to overcome the single yield surface in the one-dimensional compression test conditions, such as only the lack of plastic strain elastic strain, the model can only describe a set of parameters with different confining pressure of different sand density Soil stress-strain relationship, the shear test showed shear dilation and shrinkage characteristics can also be a good track. The simulation results of one-dimensional compression of Toyoura sand and Hostun sand under three-axis drainage and undrained conditions show that the model has better prediction ability and wider applicability.