DISASTER-PREGNANT GEOLOGICAL CONDITIONS OF COLLAPSE AND LANDSLIDE IN HUIDONG COUNTY, SICHUAN PROVINCE
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摘要:
随着乌东德水电站、白鹤滩水电站等金沙江各梯级水电站的不断开发建设及运营, 加上极端降雨多发, 会东县地质灾害呈现出多发频发的趋势, 严重威胁当地人民生产生活和生命财产安全. 在收集地质灾害历史资料以及野外详细地质调查的基础上, 分析总结了会东县地质灾害发育分布特征, 进而结合GIS分析手段, 研究了崩滑灾害与地形地貌、地层岩性、地质构造、斜坡结构、人类工程活动等孕灾因子之间的关系. 结果表明: 区内滑坡分布首先受地质构造和工程地质岩组影响, 其次受地形地貌和斜坡结构影响, 高程、坡度、斜坡结构与滑坡发育相关性都较好; 崩塌则受控于工程地质岩组, 并与坡度、地势起伏度及斜坡结构相关性较高. 综合考虑会东县内主要孕灾条件, 全县可分为四大孕灾地质条件区. 通过详细阐述每个区内的孕灾特征及发育规律, 进一步认识了会东县崩滑灾害孕灾地质条件, 可更好地助力于地方防灾减灾体系, 也可为其他地质灾害风险调查评价项目提供参考.
Abstract:With the continuous construction and operation of cascade hydropower stations on Jinsha River, coupled with frequent extreme rainfalls, the geohazards in Huidong County show a frequent tendency, seriously threatening local people's production and living. Based on the collected data of historical geohazards and detailed field geological survey, the paper analyzes and summarizes the development and distribution characteristics of geohazards in Huidong County, and the relationship between collapse-landslide and disaster-inducing factors such as landform, stratigraphic lithology, geological structure, slope structure and human engineering activities combined with GIS analysis method. The results show that the distribution of landslide in the area is affected first by geological structure and engineering geological rock formation, and then by landform and slope structure. The elevation, gradient and slope structure have good correlation with landslide development, while the collapse is controlled by engineering geological rock formation and highly correlated to gradient, relief intensity and slope structure. Considering the main disaster-inducing conditions in Huidong County, the whole county can be divided into four major disaster-pregnant geological condition areas. By description of the disaster-inducing characteristics and development laws in each area, the geological conditions of landslide disaster pregnancy in Huidong County are further recognized, which will expectedly help the local disaster prevention and reduction system, and provide reference for other geological disaster risk investigation and evaluation.
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Key words:
- geohazard /
- disaster-pregnant condition /
- collapse /
- landslide /
- hydropower station /
- Sichuan Province
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表 1 孕灾地质条件数据来源
Table 1. Data sources of the disaster-pregnant geological condition
孕灾地质条件 数据来源 地形地貌 高程 1∶ 50000地形图制作的DEM 坡度 1∶ 50000地形图制作的DEM 坡向 1∶ 50000地形图制作的DEM 地形起伏度 1∶ 50000地形图制作的DEM 地层岩性 工程地质岩组 1∶ 200000地质图、遥感解译、野外现场调查 地质构造 断层 1∶ 200000地质图、遥感解译、野外现场调查 斜坡结构 GIS分析和野外现场调查 水文地质条件 距河流距离 GIS分析和遥感解译 人类工程活动 距道路距离 GIS分析和遥感解译 平均植被覆盖度 遥感影像提取 
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