基于层次分析法在滑坡危险性评估中的应用

The application of AHP in landslide risk assessment

以青海省拟建公路民和—平安段的滑坡为主要研究对象,通过现场勘查和室内外试验,对民和至平安段4处主要滑坡即H4,H5,H11和H12分别应用层次分析法和定性定量分析法对其危险性进行了评估分析。通过对影响研究区滑坡灾害发育的坡度、岩土特性、坡高、滑坡规模、降雨条件、侵蚀条件、植被条件、人类活动条件等10个评估因子建立层次模型,对研究区滑坡危险性进行计算分析;此外结合研究区四处主要滑坡的体积、崩滑距及致灾现状等要素,应用定性定量分析法对四处滑坡危险性进行综合评价,经计算分析认为H4,H11滑坡为中等危险性,分区级别为Ⅱ级;H5,H12滑坡危险程度为轻度危险,分区为Ⅲ级,两种分析方法结果一致。评价结果对民和—平安段公路的建设、运营和养护工作具有实际指导意义。

The main research object is the landslides which lie in Minhe to Pingan county of Qinghai province. The assessments and analyses were made on the landslide risk of H4,H11,H5 and H12four landslides by analytic hierarchy process and qualitative and quantitative analysis method through field investigation,indoor and outdoor tests. The hierarchical model was made according to ten assessment factors such as slope gradient,rock- soil characteristics,slope height,landslide scale,raining conditions,erosive conditions,vegetation,human activity etc. Besides these,a comprehensive assessment was made on the four landslides risk according to the factors of landslide volume,collapse or landslide distance and disaster- caused situation. The results show that H4 and H11landslide risk degree are medium,belongs to partition Ⅱ level; H5 and H12landslide risk degree are mild,and in partition III level. The results of two methods are consistent. The studies are of practical guiding significance for Minhe to Pingan highway construction,operation and maintenance.