摘要
横断山区作为我国山地灾害发育数量最多的地区之一,其地灾发育特征与纵谷地带地貌多样性和构造背景关系密切.以兰坪县滑坡、泥石流、崩塌地质灾害为研究对象,基于地形地貌特征、工程地质岩土体、区域地质构造为孕灾地质条件,分析了这三种地质灾害的形成机制.结果显示:(1)地质灾害呈南北向带状分布于深切割中高山峡谷区和中切割中山构造剥蚀区;松散土体与软弱岩易发育滑坡、泥石流地质灾害,坚硬岩浆岩体易产生崩塌地质灾害.(2)人类工程活动对斜坡坡体的改造成为近年来地质灾害的主要诱发因素.(3)距离断层垂直距离800 m内的区域是地质灾害高发区,且距离越近,地灾活动性等级普遍越高.
The Hengduan Mountains,as one of the regions with the highest number of mountain hazards in China,have a close relationship with the geological diversity and tectonic background of the longitudinal valley zone in terms of their geological hazard development characteristics.The study focuses on geological hazards such as landslides,debris flows,and collapses in Lanping County.Based on the geological conditions of terrain and landforms,engineering geological rock and soil masses,and regional geological structures,the formation mechanisms of these three types of geological hazards were analyzed.The results are shown below:1)Geological hazards are distributed in a north-south belt pattern in the deeply-cut middle alpine gorges area and the moderately-cut middle mountainous tectonic erosion area.Loose soil masses and weak rocks are prone to geological hazards such as landslides and debris flows,while hard magmatic rock masses are prone to geological hazards such as collapse.2)The transformation of slope bodies by human engineering activities has become the main triggering factor of geological hazards in recent years.3)The area within a vertical distance of 800 meters from the fault is a high-risk area for geological hazards,and the closer the distance,the higher the level of geological hazard activity generally.
作者
牛雪妮
李俊
卢永飞
NIU Xueni;LI Jun;LU Yongfei(Yunnan Ceological Engineering Survey and Design Research Institute Co.,Ltd.,Kunming 650041,China;No.28 Hydrogeology and Engineering Geology Team,Chongqing Bureau of Geology and Minerals Exploration(Chongqing Geological Disaster Prevention and Exploration Design Institute),Chongqing 400700,China;China Electric Power Construction Corporation Kunming Survey and Design Research Institute Co.,Ltd.,Kunming 650051,China)
出处
《西安文理学院学报(自然科学版)》
2025年第2期63-68,共6页
Journal of Xi’an University(Natural Science Edition)
关键词
地质灾害
兰坪县
孕灾条件
形成机制
横断山
geologic hazard
Lanping County
conditions for nurturing geological hazards
formation mechanism
Hengduan Mountain
