摘要
为探究高山峡谷地区地质灾害易发性空间分布状况,以六盘水市水城区为研究区,选择地形坡度、地层岩性、河谷切割、地质构造以及地灾现状等5个评价因子,构建区域易发性评价指标体系,根据各评价指标的划分及赋值,结合对图层权重,按照模糊综合评价的方法及步骤,应用GIS平台上的空间分析工具对各指标图层进行栅格化处理,并进行叠加分析,得到调查区易发性评价结果,划分为极高易发区、高易发区、中易发区和低易发区四个级别进行地质灾害易发性评价。结果表明:研究区极高易发区主要分布于人类工程活动强烈一带,该区受煤矿开采区影响,破坏了斜坡岩体的结构,使原斜坡应力发生变化,导致斜坡失稳极易发生崩塌、滑坡、地面塌陷等地质灾害,研究结果可为当地政府制定地质灾害防治措施和国土空间规划提供参考。
In order to explore the spatial distribution of geological disaster susceptibility in alpine and canyon area,Shuicheng District of Liupanshui City is taken as the research area.The evaluation index system of regional vulnerability was constructed by selecting five evaluation factors,including terrain slope,stratigraphic lithology,river valley cleavage,geological structure and ground disaster status,regional susceptibility evaluation index system was constructed.According to the classification and assignment of each evaluation index,combined with the weight of the layer,according to the method and steps of fuzzy comprehensive evaluation,the spatial analysis tool on the GIS platform was applied to raster each index layer,and the superposition analysis was carried out to obtain the evaluation result of the susceptibility of the investigation area.It can be divided into four levels to evaluate the vulnerability of geological hazards:extremely high,high,medium and low.The results show that the highly prone areas in the study area are mainly distributed in the area where human engineering activities are intense.Affected by the coal mining area,the rock mass structure of the slope is damaged,the stress of the original slope is changed,and the slope instability is prone to geological disasters such as collapse,landslide and ground collapse.This research results can provide reference for local governments to formulate geological disaster prevention measures and territorial spatial planning.
作者
张珍
ZHANG Zhen(Geological Survey and Design Institute of Guizhou Nonferrous Metals and Nuclear Industry,Guiyang 550000)
出处
《四川地质学报》
2024年第2期273-277,288,共6页
Acta Geologica Sichuan
关键词
六盘水
地质灾害
易发性
评价
Liupanshui
geological hazards
susceptibility
evaluation
