工程地质学报2017，Vol.25Issue(3)：772-783,12.DOI:10.13544/j.cnki.jeg.2017.03.025
则木河断裂带活动特征和地质灾害对地貌演化的影响——以鹅掌河流域为例
ACTIVE CHARACTERISTICS AND GEOHAZARD OF ZEMUHE FAULT AND THEIR INFLUENCE ON MORPHOLOGICAL EVOLUTION IN EZHANG RIVER
摘要
Abstract
Zemuhe fault zone has characteristics of strong tectonic activity,seismic activity,and severe secondary geological disasters.This article takes Ezhang River as example and analyzes the activity characteristics of the fracture,distribution of development and long-term activity of geological disasters and its cause,morphological evolution and so on.The preliminary insights obtained are as follows:(1) The evoIution of geological environment is depended on the activity characteristics of Zemuhe breaking.The neotectonic movement determines the local strain imbalance in fault zone.Fault activities frequently induce earthquakes.The different movements of the uplifts and depressions of the fault blocks shapes the ground topography.Different deposition environments impact the erosion and sedimentation of rock and soil.Fault tilting movements control water system and geothermal migration.(2) Active faults have control effect on geological hazards.The disaster distribution has the time-space effect.In space,the disaster is distributed along the fault zone and linear distribution along the river.Lithology has marked corresponding relationship with the development of geohazards,which concentrated in the soft rock of broken band,its corresponding relationship with micro-landform.In time,the existing geology disaster is caused by coupling effect under seismic disturbance and strong rainfall.In addition,Ezhang River has a high frequency of debris flows.(3) Active faults influence the cause of disaster mechanism and disaster type and failure mode.Fragile geological environment in the coupling effect of earthquake persistent disturbance and extreme rainfall is the root causes of disasters.Disasters can be divided into three major categories and 7 minor categories according to the disaster mechanism,with typical failure mode of slope cracking shock.(4)The interaction between active faults and geological hazards determines the landform evolution.Debris flows of Ezhang River form accumulation fans,but have an influence on geomorphic migration of the Qionghai Lake.The comparison of the height caused by tectonic uplift and denudation thickness caused by disaster indicates that Ezhang River in uplift area and Qionghai Lake in sedimentation area.From here we see that,the Zemuhe fault controls regional geological environment evolution by new tectonic movement.Its forms a large number of geological disasters.At the end,uplift and depression are caused by tectonic movements.Erosion and sedimentation are caused by seismic hazard.Their combinations determine the existing landscape.关键词
则木河断裂带/构造运动/地质灾害/地貌演化/鹅掌河Key words
The Zemuhe fault/Tectonic activity/Geological disasters/Landform evolution/Ezhang River分类
建筑与水利引用本文复制引用
谢吉尊,冯文凯,杨少帅,李长顺,胡云鹏,王琦..则木河断裂带活动特征和地质灾害对地貌演化的影响——以鹅掌河流域为例[J].工程地质学报,2017,25(3):772-783,12.基金项目
国家自然科学基金项目(41172278,41572291),中国地质调查局项目(12120113010600)资助. （41172278,41572291）
