切层滑坡侵蚀有限元分析研究

Finite Element Study of Landslide Erosion in Incision Terrain

以切层滑坡侵蚀实例,以西马峪滑坡侵蚀体为研究对象,定性分析了西马峪滑坡侵蚀体的形成与变形破坏特征。结果表明,西马峪滑坡侵蚀体处于临界—不稳定状态;建立了地质模型、数学力学模型,对西马峪滑坡侵蚀体进行有限元分析计算,由有限元计算结果可知,滑动面上已形成了应力集中、分异现象,表明西马峪滑坡侵蚀体处于不稳定状态,如果有暴雨、地震、人工切割坡脚等触发因素,还会导致其再次滑动。应当采取工程治理措施,制止此类水土流失的发生。

Based on a case study of the incision terrain at Ximayu, landslide erosion, forming characteristics, deformation and destruction characteristics are qualitatively analyzed. Results show that the Ximayu landslide-body is unstable. The authors constructed a geological model and a math-mechanical model, and then calculated the landslide body by means of finite elements. The result shows that stress has concentrated on the failure plane, which further supports the evidence that the Ximayu landslide is unstable and may move under heavy rainfall conditions, due to an earthquake or as a result of human activities such as slope cutting. It is suggested that engineering measurements be conducted in order to determine methods for stabilization and the prevention of further erosion.