摘要
分析防城港地区地质灾害发育特征,探讨其成因机制十分必要。在充分收集并梳理前人调查成果的基础上,对地质灾害的类型、规模、斜坡结构、岩性特征、分布高程、地形坡度及植被发育情况进行详细的野外调查,并运用统计学进行梳理分析。研究区地质灾害发育类型有崩塌、滑坡和不稳定斜坡,以崩塌为主,规模以小型为主。地质灾害多集中发生在降雨集中的6-9月;空间上分布不均,主要集中分布在海拔小于100 m,坡度在30-50°的斜坡区域,其中以海拔小于50 m区域最为发育,且多数地质灾害集中发育在地貌变化的结合部位。绝大多数灾害发育在侵入志留系连滩组、三叠系的花岗岩中,逆向斜坡地质灾害最为发育,且与植被分布具有密切的联系。诱发地质灾害的内在因素为地形地貌、地层岩性及斜坡结构、地质构造,外部因素为降雨和人类工程活动。上述研究结果可为该区域地质灾害防治提供科学依据。
It is necessary to analyze the development characteristics of geological disasters and exploring their genetic mechanism in Fangchenggang area.On the basis of fully collecting and combing the previous investigation results,the type,scale,slope structure,lithologic characteristics,distribution elevation,terrain slope and vegetation development of the geological disasters in this area were detailedly investigated,and the statistical analysis was used.The types of geological disasters in the study area are collapse,landslide and unstable slope,mainly collapse,and the scale is small.Most of the geological disasters occur in June to September when the rainfall is concentrated.In terms of space,the geological disasters are distributed unevenly,mainly in the slope area with an altitude of less than 100 m and a slope of 30-50°.Among them,the area with an altitude of less than 50 m is the most developed,and most of the geological disasters are concentrated in the combination part of landform changes.Most of the hazards are developed in the granites which intruded in Liantan Formation of Silurian system and Triassic,and the geological hazards of reverse slope are most developed,which are closely related to the distribution of vegetation.The internal factors inducing geological disasters are topography,lithology,slope structure and geological structure,and the external factors are rainfall and anthropogenic activities.To provide scientific basis for the prevention and control of geological disasters in Fangchenggang area.
作者
张宏鑫
刘怀庆
余绍文
黄秀凤
林荣俊
ZHANG Hong-Xin;LIU Huai-Qing;YU Shao-Wen;HUANG Xiu-Feng;LIN Rong-Jun(Wuhan Center of China Geological Survey,Wuhan 430205,Hubei,China;Guanxi Geological Survey,Nanning 530023,Guangxi,China)
出处
《华南地质与矿产》
CAS
2020年第1期46-54,共9页
Geology and Mineral Resources of South China
基金
中国地质调查局项目“北海海岸带陆海统筹综合地质调查(DD20189502)”
“环北部湾南宁、北海、湛江1∶5万环境地质调查(DD20160258)”
“防城港地区水文地质工程地质调查评价(12120113004100)”。
关键词
防城港地区
地质灾害
发育特征
成因机制
geological disasters
development characteristics
formation mechanism
Fangchenggang area
作者简介
第一作者:张宏鑫(1982-),男,工程师,水文地质环境地质专业,从事水工环地质调查评价与研究工作,E-mail:Whzhongxin@qq.com。
