摘要
地面塌陷是珠江三角洲城市地质灾害的主要类型之一。广州市主城区地面塌陷频繁发生且损失严重。采用信息量数学模型与GIS技术结合对其地面塌陷灾害进行危险性评价。选取了断裂构造、地壳稳定性、第四系覆盖层厚度、基岩岩性、地下水动力条件、地表人类活动强度和地下活动强度等7个指标中的21个变量构建了危险性评价指标体系,应用ArcGIS软件参与了数据的采集、管理、分析和评价结果表达等过程,将广州市地面塌陷灾害危险性分为极不稳定级、不稳定级、次不稳定级、基本稳定级和稳定级5个等级,极不稳定级主要分布在主城区西北角,次不稳定级分布面积最广。研究结果表明:复杂的地质环境和剧烈的人类活动相耦合,加剧了地面塌陷的发生。
Ground collapse is one of the major types of geological disasters and can have serious harm to the national economy and people＇s lives and property and hamper the sustainable development in Guangzhou. The Information- value model and GIS are used for the fatalness appraisal study of ground collapse in downtown area of Guangzhou city. The appraisement indexes are conceived through choosing these factors such as fault, the stability of the earth＇s crust, the quaternary sediment lithology and thickness, bedrock lithology, groundwater dynamics conditions, surface and underground intensity of human activities. ArcGIS software is applied involving in data collection, data management, data analysis and evaluation process, expressing. Finally, the fatalness classification chart of grade about ground collapse in Guangzhou is produced. The result tells us that there are five fatalness grades in main urban area, the most dangerous zone distribute in the south of Guang -hua basin, the more dangerous zone distribute the west - north of main urban, in Guang - cong fault or the intersection of subway, the basic stable grade zone distribute in the center of main urban area. The results show that the collapse hazard are caused by the interaction of the complicated nature environmental elements and the intense human activities.
出处
《工程地质学报》
CSCD
2007年第5期630-634,共5页
Journal of Engineering Geology
基金
广东省自然科学基金资助项目(000531)
广州市教育局科技计划项目(2022).
关键词
地面塌陷
危险性评价
信息量法
GIS
广州市
Ground collapse, Hazard appraisement, Information value model, GIS, Guangzhou city
