四川省达县青宁乡滑坡的基本特征和形成机理分析

在已有勘察资料的基础上,结合野外实际调查,对四川达县青宁乡滑坡的基本特征和发生机理进行了初步的研究。研究得出以下结论:青宁乡滑坡是第四系松散层在下伏基岩面上滑动形成的;该滑坡是一个滑坡与泥石流共存,且滑坡为泥石流提供物源的复合型滑坡,如果外部条件具备(例如降雨量足够大),该滑坡将有更多的部分转化为泥石流,受灾面积会更大;暴雨是该滑坡发生的诱发因素,也是部分滑坡转化为泥石流的关键因素。

Analysis of basic characteristics and forming mechanism of Qingning landslide,Daxian, Sichuan Province, China

Based on survey material and practical investigation, we studied the basic characteristics and forming mechanism of the Qingning landslide, Daxian, Sichuan Province. The research has reached the following conclusions. (1)The Qingning landslide was formed by the sliding of loose Quaternary deposits along the lower bedrock. (2)The landslide was a composite landslide including landslide and debris flow and the landslide supplied material for debris flow; if the exterior conditions were more severe (for example, the rainfall were much heavier), more landslide would have converted into debris flow, and the damaged area would be much larger. (3)The rainfall was the inducing factor for the landslide and the key factor for its turning into debris flow.