某黄土滑坡破坏机理数值研究

为了研究某黄土滑坡破坏的作用机理,运用有限元软件建立了三维有限元数值模型,分析了滑体和滑床之间的相互作用,研究了滑坡体破坏与加载变化影响因素的关系,并总结了在这些复杂因素下滑坡体应力变化规律。结果表明:在加载过程中,随着滑体的变形及拉裂,滑坡体的应力有从上部集中到整体分散的规律,当加载到一定程度时,滑体与滑床在顶端出现拉裂,进而沿着接触面迅速分离,滑坡的变形也从滑体的局部变形转变到滑体的整体失稳。数值模拟的结果与工程经验基本一致。

Numerical Study on Failure Mechanism of a Loess Landslide

In order to study the failure mechanism of a loess landslide, this paper established a three-dimensional finite element numerical model with FEM software, by which the interaction between the sliding mass and the sliding bed was analyzed, the relationship between the landslide failure and the variation of loads studied, and the change rules of the stress thereof under these complex factors generalized. The results show that, in the loading process, as the landslide deforms and cracks in tension, the stress thereof behaves in such a way that it is concentrated in the upper part, then dispersed completely; when loading to certain extent, the sliding mass and sliding bed have such cracks at the top, and are further separated rapidly along the contact surface; the landslide is subject to local deformation, then to failure wholly at last. The result of numerical simulation is in conformance with the engineering experience.