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滑坡灾害主要是指滑体突然产生较大的土体滑动,巨大的滑动力会摧毁其所遇到的建筑物,造成重大的损失。本文采用数值方法的变模量强度折减法,分析滑坡滑动的位移变化过程,发现牵引式滑坡位移突变性大于推移式滑坡,更容易产生滑坡灾害;相反,推移式滑坡在滑动前会有明显的预警位移,因此提出“塑性”坡的概念,“塑性”坡发生灾害滑动前有显著的变形预警,这样,“塑性”坡可以避免或减少滑坡的灾害。此外,通过计算实例的分析结果,表明牵引式滑坡或当滑面上存在应力水平差异大的情况时,整体极限稳定分析法的安全系数存在偏大的风险。上述结论为避免或减少滑坡灾害开辟新的研究思路。
Landslide disaster mainly refers to the sudden slip of large landslide soil slide, a huge sliding force will destroy the building they encounter, causing significant losses. In this paper, the numerical method of strength reduction method is used to analyze the displacement process of landslide slip. It is found that the sudden change of traction landslide is greater than that of sliding landslide, which is more prone to landslide hazard. On the contrary, Therefore, the concept of “plasticity” is put forward and the notion of “plasticity” is obvious, so there is a significant deformation warning before the occurrence of a disaster. Therefore, “plasticity” can avoid or reduce landslide disasters. In addition, by analyzing the results of the example, it is shown that the safety factor of the whole limit stability analysis has the risk of being oversized when the traction landslide or when there is a big difference in the stress level on the slip surface. The above conclusion opens up new research ideas for avoiding or reducing landslide hazards.