结构性土二元介质模型的有限元模拟

针对土的结构性对边坡稳定性的影响，结构性土二元介质模型将胶结元看成理想弹脆性材料，摩擦元看成硬化型弹塑性材料。基于该模型建立考虑结构性土的强度准则，编制相应有限元程序用于Biot固结的有限元模拟。通过对比初始各向同性和初始应力各向异性结构性土的天然边坡算例计算结果，发现初始应力各向异性天然边坡的安全系数要高于初始均质天然边坡；嵌入初始应力各向异性结构性土的强度准则后可以观察计算过程中边坡破坏区的发展，为采用破坏区贯通作为边坡的破坏标准的天然边坡的稳定性分析提供了一种新的思路且具有良好的工程适用性。

FEM Simulation of Binary Medium Model for Structured Soils

In view of the structural of soil impact on the stability of the slope, the Binary Medium Model (BMM), is defined as bonding elements and frictional elements which are idealized as elastic-brittle element and hardening elastic-plastic element respectively. In view of this, the strength criterion of the structured soils was established based on the BMM, and the programming of finite element modeling (FEM) for solving the Biot consolidation problem was coded. By comparisons of the simulated results of the natural slopes with initial stress-induced anisotropy and initial isotropy, it was demonstrated that the safety factor of the natural slopes with initial stress-induced anisotropy is higher than the other. By introducing the strength criterion of structured soils with initial stress-induced anisotropy to FEM for solving the Biot consolidation problem, the development of the damage zone in the process of calculating was shown, which reflected good engineering applicability and provided a new idea to evaluate the natural slope stability for the damage zone connected as the standard of slope failure.