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对于超固结黏土和密实砂土等软化材料或非关联塑性材料组成的地基、边坡及挡土墙墙后土体,在其破坏过程中,会产生应变局部化现象,使得控制方程的类型发生改变,从而导致出现数值解不惟一和解的网格相关性等现象。为了克服这些数值困难,基于强间断分析方法,及单元内嵌不连续面的有限元模型,对地基、土坡、墙后土体的渐进破坏过程进行了数值模拟。计算结果表明,单元内嵌不连续面模型可以有效地模拟土工结构失稳破坏过程,并且能够明显地改善采用常规有限元方法所产生的网格尺寸相关性问题。这一方法可作为传统极限平衡法进行稳定分析、承载力分析的有益补充。
For the foundation, slope and retaining soil behind the wall consisting of softened material such as overconsolidated clay and compacted sand, or non-associated plastic material, strain localization occurs in the process of its destruction, making the type of governing equation Change, resulting in numerical solution not only the reconciliation of the grid and other phenomena. In order to overcome these numerical difficulties, based on the strong discontinuity analysis method and the finite element model of the unit embedded discontinuities, the asymptotic behavior of soil under the foundation, soil slope and back wall is numerically simulated. The calculation results show that the unit discontinuity model can simulate the failure process of the geotechnical structure effectively, and can obviously improve the grid size dependence caused by the conventional finite element method. This method can be used as a traditional limit equilibrium method for stability analysis, bearing capacity analysis of the beneficial complement.