考虑U型横断面影响下的滑坡稳定性分析思路探讨

Analysis Method of Landslide Stability under the Influence of U-type Cross Section

滑坡灾害的形成是内外因素综合作用的结果,其稳定—滑动—稳定的发展演化过程极为复杂。特别是针对于大型的堆积体滑坡,如何从滑坡形成机理出发,进行较为可靠的稳定性评价,显得尤为重要。文中以贵州省沿河县龙家岩滑坡为例,分别采用传递系数法与三维数值计算定量分析滑坡的稳定性,得出传递系数法分析U型横断面影响下的滑坡稳定性具有较大的局限性,最后探讨了基于能量守恒定律的滑坡稳定性评价思路的可行性。

Landslide is the result of comprehensive effect of internal and external factors, evolution process from stable to sliding to stable is very complex, especially for large accumulation landslide, how to require the information from the formation mechanism of landslide and evaluate the stability is particularly important. In this paper the Longjiayan landslide in Yanhe County of Guizhou Province is taken as the supported engineering example, the stability of landslide is analyzed by transfer coefficient method and three dimensional numerical calculation, and the conclusion is drawn that the transfer coefficient method has quite large limitation to analyze the stability of landslide under the influence of U type cross section. In the end, feasibility of evaluating the stability of the landslide based on the energy conservation law is discussed and explored.