论文部分内容阅读
采用改进的Mohr-Coulomb屈服准则(Zienkiewicz-Pande准则),建立了能描述人工冻土3个阶段蠕变特性的黏弹塑损伤耦合本构模型.基于该本构模型建立了模型的柔度矩阵,将本构模型嵌入到ADINA有限元程序中.计算表明:数值模拟得到的人工冻土蠕变特性曲线与实测值吻合良好,最大误差为4.8%,说明基于改进的Mohr-Coulomb准则建立的黏弹塑损伤耦合本构模型能够准确的描述人工冻土剪切特性和3个阶段的蠕变特性.获得的本构模型具有参数少、容易确定等优点.深部人工冻土黏弹塑损伤耦合本构模型的建立,对于人工冻土结构物长期稳定分析和预测具有重大的理论指导意义.
Based on the improved Mohr-Coulomb yield criterion (Zienkiewicz-Pande criterion), a viscoelastic-plastic damage coupled constitutive model can be established to describe the three-stage creep characteristics of artificial frozen soil. Based on this constitutive model, , The constitutive model was embedded into the ADINA finite element program.The calculated results show that the creep characteristics of the artificial frozen soil obtained by numerical simulation are in good agreement with the measured values and the maximum error is 4.8%, which shows that the creep characteristics of the artificial frozen soil based on the improved Mohr-Coulomb criterion Coupling constitutive model of elastic-plastic damage can accurately describe the shear characteristics of the frozen soil and the creep characteristics of the three phases.The obtained constitutive model has the advantages of less parameters, easy to determine, etc. The coupling of the viscoelastic-plastic damage of deep frozen soil The establishment of structural model is of great theoretical guiding significance for long-term stability analysis and prediction of artificial frozen soil structure.