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利用非线性弹塑性有限元对具有不同筋材层数砂土挡墙的模型试验结果进行了系列性的模拟与分析。有限元解析采用了基于修正塑性功砂土的硬软化弹塑性本构模型,它可以同时考虑砂土强度的各向异性、应力水平相关性、剪切应变局部化特性以及应力路径效应等。研究结果表明,利用这种较高精度的有限元解析方法对加筋砂土挡墙的变形破坏进行分析,不仅能较好地模拟加筋砂土挡墙基础底面的平均压力与沉降之间的关系,同时也能较好地再现筋材层数变化对加筋砂土挡墙承载力与变形的加筋加固影响。虽然本文所分析的各种工况中加筋材的抗拉总刚度(或总重量)不变,但随着所划分筋材层数的增多,加筋砂土挡墙的承载力明显增大。另外,利用以上建议的有限元方法也能合理地模拟不同层数加筋砂土挡墙的剪切带发生发展状况、加筋材的拉力、面板的水平土压力分布、以及加筋砂土挡墙的渐进性变形破坏特性,从而为定量化地把握和理解加筋砂土挡墙中筋材层数的变化影响和加固效果提供了一个有效的途径。
The nonlinear elastic-plastic finite element method is used to simulate and analyze the model test results of sand retaining walls with different layers of tendons. The finite element method uses the softening elasto-plastic constitutive model based on the modified plastic working sand, which can simultaneously consider the anisotropy of sand strength, the correlation of stress level, the localization of shear strain and the stress path effect. The results show that the analysis of the deformation and failure of the reinforced sand retaining wall using this higher precision finite element analysis method can not only simulate the relationship between the average pressure and the settlement of the bottom surface of the reinforced sand retaining wall But also to better reproduce the effect of reinforcement layer reinforcement on the bearing capacity and deformation of reinforced sand retaining walls. Although the total tensile stiffness (or total weight) of the reinforced material in various conditions analyzed in this paper is unchanged, the bearing capacity of the reinforced sand retaining wall increases significantly with the increase of the number of layers . In addition, the finite element method proposed above can also reasonably simulate the occurrence and development of shear bands in different layers of reinforced sand retaining walls, the tensile force of the reinforced material, the horizontal earth pressure distribution of the panel, and the reinforced sand block The gradual deformation and failure of the wall, which provides an effective way to quantitatively grasp and understand the influence of the reinforcement layer and reinforcement effect in the reinforced sand retaining wall.