摘要
三峡库区滑坡众多,自水库蓄水以来,库水周期性变化且降雨充沛,对库区滑坡稳定性产生影响。以三峡库区墓坪滑坡为例,通过野外地质调查、位移监测等数据资料,采用定性与定量相结合的方法,分析了降雨与库水耦合作用下滑坡的变形机制。结果表明,墓坪滑坡的“阶跃”现象呈现出一大多小特征,大的“阶跃”现象伴随着库水位大幅波动和明显降雨;当库水位下降时,滑坡变形响应更为敏感,这是由于地下水与库水位的水头差指向滑坡外所致;单日强降雨和连续降雨均可引起滑坡变形,高水位运行阶段峰值速率滞后时间为9 d。研究成果可为墓坪滑坡灾害防治及同类滑坡的研究提供依据。
Many landslides have occurred in Three Gorges Reservoir area.Since the impoundment of the reservoir,the reservoir pool water level changes periodically and the rainfall is abundant,which has an impact on the stability of slopes in the reservoir area.The Muping landslide in the Three Gorges Reservoir area was presented as a case history in this paper.The deformation mechanism of the landslide under the coupled effect of the rainfall and the reservoir pool water level is analyzed by using the combination of qualitative and quantitative methods throughout the field geological survey,the displacement monitoring and other data.The results show that the"stepped"phenomenon of the Muping landslide presents a small characteristic,and the large"stepped"phenomenon is accompanied by the large fluctuation of the reservoir pool water level and the obvious rainfall;When the reservoir pool water level drops,the landslide deformation response is more sensitive,because the head difference be-tween the groundwater and the reservoir pool water level points out of the landslide.Single day heavy rainfall and the continu-ous rainfall can cause the landslide deformation,and the lag time of the peak rate in high pool water level operation stage is 9 days.The research results can provide a basis for the prevention and the control of Muping the landslide hazard and the study of similarlandslides.
作者
雷玉
张家旭
高晨曦
LEI Yu;ZHANG Jiaxu;GAO Chenxi(Hubei Key Laboratory of Disaster Prevention and Mitigation,Three Gorges University,Yichang 443002;Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry of Education,Three Gorges University,Yichang 443002;Hydrogeology and Engineering Geology Institute of Hubei Geological Bureau,Jingzhou 434020)
出处
《土工基础》
2024年第2期229-233,共5页
Soil Engineering and Foundation
基金
国家自然科学基金资助项目(42074005)。
关键词
三峡库区
土质滑坡
库水
降雨
Three Gorges Reservoir Area
Landslide in Soils
Reservoir Pool Water
Rainfall
