摘要
在野外考察无详细勘测资料的情况下,采用危险指数法对达县青宁乡滑坡的变形特点和形成条件,以及触发因素进行了快速评价,建立了滑坡危害性分区标准。研究认为该滑坡为一特大型推移式中厚层堆积层滑坡。主滑坡体自上而下,由推动区、挤压区和滑动区三部分组成。滑坡不同部位的危险指数具有明显的差异,滑坡体各部位的破坏方式和危害性也各异。
The Qingning town landslide occurred after a heavy rainstorm. More than 1 000 houses were destroyed, 550 families, 2 200 person suffer injuries. Field investigations revealed that this landslide developed in easy-slidestratum, with bedding structure and have sufficient sliding space. After the researched on its transform characters and processes, forming conditions and causal factors, the landslide can be divided into three sections from the upper side to the foot： driving section, extrusion section and sliding section. The main triggering factors are mainly the heavy rain, as well as the leakage of the surface water. It is an oversize middle-thick driving accumulate landslide. The slip velocity is 8.3 m/h, 6. 2 m/h and 1. 9 m/h in different areas. Overlay its size, velocity and moving time, then got the risk indexes of this landslide. The foot area is badly destroyed area, and the middle area is much worse, the crown area is worst. After calculate its stability by Transfer Coefficient Method, it is in the critical status before the rain. When the rain began, the slope fully extracts water and its safety factor descent rapidly. The safety factor is 0. 60 under the saturation moisture state. After landslide, its center of gravity dropped, and released its sliding energy. As well as the slide body divided into pieces. The accumulated water leaked and loses its supplement. Therefore, the slope is stable at present.
出处
《山地学报》
CSCD
北大核心
2008年第6期739-744,共6页
Mountain Research
基金
科技部"十一五"重点科技支撑计划项目(NO.2006BAC04B05)
科技部国际科技合作项目(2007DFA21150)
中科院三期重要方向创新项目(KJCX3-SW-L1-6)资助~~
关键词
危险指数
达县
暴雨
滑坡
risk index
Daxian county
rainstorm
landslide
