论文部分内容阅读
考虑到基于复杂弹塑性模型与扰动状态概念的本构模型在数值积分时的困难,以Duncan-Chang(E-B)模型描述材料在相对完整状态(RI)下的响应,用临界状态模型描述材料在完全调整状态(FA)下的力学行为。依据常规三轴试验曲线判断材料状态的转变并建议了相应的扰动因子计算方法。利用Abaqus软件实现了相应的程序代码,数值算例模拟了堆石料的三轴试验,结果表明邓肯-张模型与扰动状态概念的结合在模拟应变软化、剪缩与剪胀方面具有良好能力。在此基础上进一步模拟了某混凝土面板堆石坝的施工、蓄水、退水的过程,数值结果表明变形分布符合一般规律,且在定量上与原型观测吻合较好。
Considering the difficulty in numerical integration of the constitutive model based on the concept of complex elasto-plastic model and disturbance state, the Duncan-Chang (EB) model is used to describe the response of material under relatively complete state (RI), and the critical state model Fully adjust the mechanical behavior under state (FA). Based on the conventional triaxial test curve, the change of material state was judged and the corresponding calculation method of perturbation factor was proposed. The corresponding program code is realized by Abaqus software. The numerical example simulates the triaxial test of rockfill. The results show that the combination of Duncan - Chang model and the concept of disturbance state has good ability in simulating strain softening, shearing and dilatancy. On this basis, the process of construction, storage and return of a concrete faced rockfill dam is further simulated. The numerical results show that the deformation distribution accords with the general law and is in good agreement with the prototype observation quantitatively.