摘要
黔东北地区是一个地质环境复杂的地区,地质灾害分布范围广、数量多,属于贵州省地质灾害高易发区域。为了深入研究地质灾害时空分布特征与孕灾地质环境规律,以黔东北地区沿河县为研究区,通过野外孕灾地质条件实地调查成果资料,结合历年地质灾害数据,详细阐述研究区内地质灾害分布的总体特征,总结地质灾害孕灾地质条件,深入分析各类孕灾因子对滑坡、崩塌等地质灾害发育的控制作用,通过综合分析研究区内孕灾地质条件,进一步将研究区划分为三大孕灾地质条件区,为减轻地质灾害风险、防灾减灾提供了科学依据。研究结果表明:研究区内地质灾害发生的时间受月平均降雨量影响十分显著;空间分布情况受地层岩性特征影响较大;区内地质灾害主要孕灾地质条件为地形地貌、地层岩性、斜坡结构等,降雨和人类工程活动为外部诱发因素;区内易滑地层主要为中志留统秀山组、下志留统龙马溪组、下奥陶统大湾组等;易崩地层主要为下奥陶统大湾组、下志留统雷家屯组、中二叠统茅口组;不同灾种的斜坡结构具有明显的差异性,滑坡主要发育于凹型和折线型斜坡,崩塌则多发育于凸型斜坡;研究区内地表水系与地质灾害发生具有一定关联性,区内乌江流域水系沿线200m范围内发生地质灾害数量占灾害总数的9.74%。
Northeast Guizhou is a region with a complex geological environment,with a wide distribution range and a large number of geological Hazards,making it a high-risk area for geological hazards in Guizhou Province.In order to conduct in depth research on the Spatio-temporal distribution characteristics of geological hazards and the laws of geological environment,Yanhe county in northeastern Guizhou was selected as the research area.Through regional survey of disaster-inducing environment and combined with geological hazards data from previous years,the overall distribution characteristics of geological hazards in the research area were elaborated in detail.The geological conditions of geological hazards were summarized,and the control effects of various disaster-inducing factors on the development of geological hazards such as landslide and collapse were analyzed in depth.The results indicate that the occurrence of geological disasters in the study area is significantly affected by the average monthly rainfall.The spatial distribution is greatly influenced by the lithological characteristics of the strata.The main geological conditions for geological hazards in the area are terrain,lithology,slope structure,etc.,with rainfall and human engineering activities as external inducing factors.The main slippery stratum in the area are the Xiushan Formation of Middle Silurian,the Longmaxi Formation of Lower Silurian,and the Dawan Formation of Lower Ordovician.The easily collapsing strata are mainly composed of the Dawan Formation of Lower Ordovician,the Leijiatun Formation of Lower Silurian,and the Maokou Formation of Middle Permian.The slope structures of different types of hazards have significant differences.Landslides mainly develop on concave and broken line slopes,while collapses mostly develop on convex slopes.There is a certain correlation between the occurrence of geological hazards and the surface water system in study area.The number of geological hazards occurring within 200m along the Wujiang River Basin in the area accounts for 9.74%of the total.
作者
杨晶晶
肖玉
安泉
刘浩
公斌
YANG Jingjing;XIAO Yu;AN Quan;LIU Hao;GONG Bin(General Prospecting Institute,CNACG,Beijing 100039;117 Geological Party,Guizhou Bureau of Geology and Mineral Exploration and Development,Guiyang,Guizhou 550018)
出处
《中国煤炭地质》
2024年第2期64-68,共5页
Coal Geology of China
基金
中央自然灾害防治体系建设项目(Z195110010003)。
关键词
地质灾害
孕灾条件
滑坡
沿河县
geological hazards
disaster-inducing condition
landslide
Yanhe county
