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为准确描述结构性土、超固结土的复杂弹塑性力学行为,对上下负荷面模型中的超固结状态变量R与结构性状态变量R*的演化规律进行改进,运用Sheng建议的破坏准则把模型的应用范围拓宽到三维应力空间,建立了三维应力空间下改进状态变量的上下负荷面模型。详细介绍了该模型隐式应力更新算法的数值实现过程,编制了对应的接口子程序,实现了对有限元软件的二次开发,并通过一系列数值模拟验证了模型的合理性、程序的精度与稳定性。最后应用本文模型模拟Boom黏土和Fujinomori黏土并与试验数据对比,结果表明,模型能够准确描述结构性土、超固结土的力学特征。
In order to accurately describe the complex elasto-plastic mechanical behaviors of structural soils and overconsolidated soils, the evolution rules of the overconsolidated state variables R and the structural state variables R * in the upper and lower load-bearing models are improved. By using the Sheng’s proposed failure criterion The application scope of the model is extended to the three-dimensional stress space, and the upper and lower load surface models for improving the state variables in the three-dimensional stress space are established. The numerical implementation process of the implicit stress update algorithm is introduced in detail. Corresponding interface subroutines are compiled and the secondary development of the finite element software is realized. The validity of the model and the accuracy of the program are verified through a series of numerical simulations And stability. Finally, the model of this paper is used to simulate Boom clay and Fujinomori clay and compared with the experimental data. The results show that the model can accurately describe the mechanical characteristics of the structural soil and overconsolidated soil.