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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。通过对比初始应力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破坏标准的天然边坡稳定性分析提供一种新的思路,且具有良好的工程适用性。
In view of the influence of soil structure on the slope stability, the structural soil binary medium model regards cemented carbide as ideal elastic material and frictional material as hardened elastic-plastic material. Based on the model, the strength criterion considering structural soil is established and the finite element program of Biot consolidation is developed. By comparing the calculated results of natural slope with anisotropy of initial stress and anisotropy of initial stress, it is found that the safety factor of natural slope with initial stress anisotropy is higher than that of initial homogeneous natural slope. The initial stress After the strength criterion of anisotropic structured soil can observe the development of slope failure area in the calculation process, it provides a new idea for the stability analysis of natural slope using the failure zone penetration as the criterion of slope failure, and has a good Engineering suitability.