中文摘要：

有弄软紧张的行为与增加塑料紧张作为力量的减小表明的土壤通常在自然环境被发现。为在这些土壤的斜坡，进步失败机制能与增加紧张由于力量的减小发生。基于的数字途径广泛地为模仿如此的失败机制被执行了的有限元素方法，为跟踪形成和发展拥有到他们的能力局部性砍紧张。然而，当前使用的途径的可靠性被差的集中或重要网孔相关性经常影响，并且他们的适用性由复杂土壤模型的使用是有限的。由开发一个有限元素克服这些限制的目的用本地弧长度接近的这份报纸作为答案策略控制了反复的算法。在建议有限元素途径，土壤与 elastoplastic 被模仿与 Mohr 库仑收益功能一起的组成的模型。弄软紧张的行为被在 Mohr 库仑力量参数和 deviatoric 塑料紧张之间的一种片明智的线性关系代表。为了估计建议有限元素的可靠性，来临，不同有限元素方法和网孔与各种各样的质量获得的数字答案的比较被介绍。而且，挖掘在一个真实高速公路构造工程触发的山崩被介绍有限元素途径分析为实际工程问题表明它的适用性。

英文摘要：

Soils with strain-softening behavior — manifesting as a reduction of strength with increasing plastic strain — are commonly found in the natural environment. For slopes in these soils,a progressive failure mechanism can occur due to a reduction of strength with increasing strain. Finite element method based numerical approaches have been widely performed for simulating such failure mechanism,owning to their ability for tracing the formation and development of the localized shear strain. However,the reliability of the currently used approaches are often affected by poor convergence or significant mesh-dependency,and their applicability is limited by the use of complicated soil models. This paper aims to overcome these limitations by developing a finite element approach using a local arc-length controlled iterative algorithm as the solution strategy. In the proposed finite element approach,the soils are simulated with an elastoplastic constitutive model in conjunction with the Mohr-Coulomb yield function. The strain-softening behavior is represented by a piece-wise linearrelationship between the Mohr-Coulomb strength parameters and the deviatoric plastic strain. To assess the reliability of the proposed finite element approach,comparisons of the numerical solutions obtained by different finite element methods and meshes with various qualities are presented. Moreover,a landslide triggered by excavation in a real expressway construction project is analyzed by the presented finite element approach to demonstrate its applicability for practical engineering problems.