基于综合危险性指数法的永新县地质灾害易发程度分区评价

Applied research on assessment methods based on comprehensive hazard index for the susceptibility of geological hazards in Yongxin area

永新县是江西省内地质灾害较为严重的县之一,滑坡、崩塌、泥石流、地面塌陷等地质灾害遍布全县各乡镇。本文基于地表调查的地质灾害现状,综合考虑各类型地质灾害形成的影响因素,选取地层岩石、地质构造、自然坡度、自然坡高、人工切坡、矿产开采等6个影响因子,通过对地质灾害发育程度及潜在发育程度的分析,运用基于地质灾害危险性指数和层次分析模型的耦合分析,将全县划分为2个地质灾害高易发区、4个中易发区、2个低易发区和1个不易发区。分区结果与实地野外调查情况相符,高易发区与地质构造、地形、降雨以及人类活动引起的水土流失等因素有密切关系。该评价方法可以为永新县地质灾害的防治提供科学依据,并可为山地、丘陵地区的地质灾害易发性评价提供针对性指导。

Yongxin County is one of the counties with more serious geological disasters in Jiangxi Province. Geological disasters such as landslides, collapses, mudslides, and ground subsidence are all over the county.Based on the current situation of geological disasters in surface surveys, this paper comprehensively considers the influencing factors of the formation of various types of geological disasters, and selects 6 influencing factors such as formation rocks, geological structures, natural slopes, natural slope heights, artificial slope cutting, and mineral mining. Through the analysis of the development degree and potential development degree of geological disasters, and the coupling analysis based on the geological disaster risk index and the analytic hierarchy process model, the county is divided into 2 high-prone areas, 4 medium-prone areas, and 2 low-risk areas, and 1 less prone zone.The results of the zoning are consistent with the field investigation, and the high-risk areas are closely related to factors such as geological structure, topography, rainfall, and soil erosion caused by human activities.The evaluation method can provide a scientific basis for the prevention and control of geological disasters in Yongxin County, and can provide targeted guidance for the evaluation of the susceptibility of geological disasters in mountainous and hilly areas.