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以剑桥模型的剪胀方程为基础,引入曲线形态调节因式,提出了一个新的剪胀方程,并依此构建了一个适用于粗粒土的广义塑性模型。主要结论如下:(1)所提剪胀方程能够反映粗粒土剪胀比和应力比之间的非线性关系,且参数定义明确、确定方法简单,并通过试验验证了其对粗粒土的剪缩和剪胀特性的描述能力较好;(2)所构建的广义塑性本构模型参数为9个,并给出了通过室内常规试验确定参数的方法;(3)推导了该模型在一般应力状态下的刚度矩阵,并证明了其对粗粒料普通三轴CD试验具有良好的拟合效果,进一步地,利用三轴等p试验和两段等应力比试验验证了模型的适用性。
Based on the dilatancy equation of Cambridge model, a new dilatancy equation is proposed by introducing the modality of curve shape. Based on this, a generalized plastic model suitable for coarse grained soil is constructed. The main conclusions are as follows: (1) The proposed dilatancy equation can reflect the nonlinear relationship between the dilatancy ratio and the stress ratio of coarse grained soil. The definition of the parameters is clear, and the determination method is simple. (2) The parameters of the generalized plastic constitutive model constructed are 9, and the method of determining the parameters through the routine experiment in the interior is given. (3) The model is generalized Stiffness matrix under stress state and proves that it has a good fitting effect on ordinary three-axis CD test of coarse aggregates. Further, the applicability of the model is verified by three-axis p-test and two-stage iso-stress ratio test.