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利用弥散裂缝理论,提出了压实黏土拉伸状态下的脆性断裂模型。当压实黏土达到其极限抗拉强度后,通过建立单元的各向异性刚度矩阵,将土体裂缝弥散于实体单元,构造了平面应变条件下考虑压实黏土脆性开裂的有限元计算模式。通过对某压实黏土单轴拉伸试验成果的模拟计算,验证了构建的脆性断裂模型和有限元算法对土体拉伸破坏特性和裂缝发展过程的适用性。本文还进行了模拟软弱面水压“楔劈效应”的简单数值试验,表明压实黏土脆性开裂模型和算法可较好地模拟裂缝扩展行为。
Based on the theory of dispersive fracture, a brittle fracture model of compacted clay under tensile condition was proposed. After compacted clay reaches its ultimate tensile strength, the soil crack is dispersed in the solid element by establishing the anisotropic stiffness matrix of the element. The finite element calculation mode considering the brittle fracture of compacted clay under plane strain is constructed. Through the simulation calculation of uniaxial tensile test results of a compacted clay, the applicability of the constructed brittle fracture model and finite element method to the tensile failure characteristics of soil and fracture development process are verified. In addition, a simple numerical experiment was carried out to simulate the “wedge effect” of hydraulic pressure on the weak surface, which shows that the brittle fracture model and algorithm of compacted clay can simulate the crack propagation behavior well.