摘要
水库塌岸是库区重大的地质灾害,对库岸滑坡的长期稳定性有重要影响。以麻柳林滑坡为例,在现场调查的基础上,考虑了船行波的影响,采用卡丘金法对三峡水库塌岸进行了预测,并针对塌岸前和塌岸后的麻柳林滑坡,分别设定了4种库水位下降工况,且考虑50年一遇的极值降雨,研究了库水位下降联合降雨作用下麻柳林滑坡的稳定性,分析了塌岸对该滑坡稳定性的影响。结果表明:在航运繁忙的狭长河道进行塌岸预测时,船行波的影响不能忽略,预测得到麻柳林滑坡最终的塌岸宽度为120m;塌岸后麻柳林滑坡前缘变缓,与库水接触面增大,在库水位下降过程中,地下水浸润线较塌岸前更低;对于麻柳林滑坡,塌岸侵蚀了前缘阻滑段,导致该滑坡的稳定性降低约3%。
Bank collapse is a major geological hazard in reservoir area,which has a profound influence on the longterm stability of landslides.This paper takes Maliulin landslide as a case and carries out bank collapse prediction by using Kachugin method based on the field investigation and considering the influence of ship wave.The paper conducts the stability analysis before and after bank collapse to explore the influence of bank collapse on the stability of Maliulin landslide by considering the effect of reservoir drawdown and extreme rainfall,specifically,including four different reservoir drawdown rates and a return period of extreme rainfall of 50 years.The results show that when bank collapse prediction in narrow rivers with busy shipping is carried out,the influence of ship wave cannot be ignored.The ultimate bank collapse width of Maliulin landslide is 120 m.When bank collapse is over,the front terrain of landslide becomes gentle,and the interface between landslide and reservoir water increases,which causing a lower infiltration line.The bank collapse erodes the anti-slide section of Maliulin landslide,resulting a reduction of landslide stability by 3%.
作者
肖长波
刘毅
谭超
任蕊
XIAO Changbo;LIU Yi;TAN Chao;REN Rui(Sichuan Institute of Geological Engineering Investigation,Chengdu 610072,China;China Electric Power Research Institute Limited Company,Beijing 100055,China;Faculty of Engineering,China University of Geosciences（Wuhan）,Wuhan 430074,China)
出处
《安全与环境工程》
CAS
北大核心
2018年第4期41-45,63,共6页
Safety and Environmental Engineering
基金
国家自然科学基金项目(41572292
41601563)
国家电网公司科技项目(GCB17201700121)
关键词
麻柳林滑坡
塌岸预测
卡丘金法
稳定性
船行波
Maliulin landslide
bank collapse prediction
Kachugin method
stability
ship wave
