A Preliminary Study On The General Index System And Its Value Standard Of Landslide Susceptibility Evaluation In The Loess Hilly Region

In order to solve the problems of the evaluation result is not comparable and the bounry is not connected caused by the lack of general evaluation index system and its value standard in the current evaluation process of landslide susceptibility.This paper is based on the geological hazard investigation data of Ansai County in Shaanxi Province,Mianchi County in Henan Province and Pengyang County in Ningxia Hui Autonomous Region,refers to the experience of previous research results,use GIS technology,carry out research on landslide susceptibility evaluation general index system and its value standard in the loess hilly region.The results have an important theoretical significance for promoting the unity of geological hazard susceptibility evaluation in the loess area.The main results of this paper are obtained as follows:(1)Preliminary analyzed the main influencing factors of landslide hazards in the loess hilly area.Among them,the controlling factors include topography(slope degree,slope height,slope type),hydrogeological condition,vegetation coverage condition,and lithology;the main cause is rainfall condition.(2)Put forward the principles of building evaluation general index system and the basis;Comprehensive consideration of the main influencing factors of landslide in the loess hilly area,selecting 7 evaluation index,such as,slope degree,slope height,slope type,distance from rivers,vegetation coverage,lithology and average annual rainfall.According to the degree of impact,the evaluation index was divided into 21 subtypes,used frequency ratio as the quantitative value standard for each subtypes,the general index system and its value standard of landslide susceptibility evaluation in the loess hilly region have been preliminarily established.(3)Taking Ganquan County as an example,the landslide susceptibility evaluation was carried out to verify the rationality of the susceptibility evaluation general index system and its value standard for landslide hazard in the loess hilly area.The evaluation result was in good agreement with the actual situation,it showed that the established evaluation index system and its value standard are reasonable.