摘要
以三峡库区巫山轿顶峰2号滑坡为例,结合库水位变化、地质环境条件资料,通过现场调查测绘、无人机航空摄影测量、工程地质钻探、地表及深部位移监测等方法,详细分析了该滑坡的变形特征、成因机制与发展趋势。该滑坡体积约250×10^(4)m^(3),为大型单斜顺层新生岩质滑坡。滑坡前后缘高差约380m,前缘剪出口高陡临空,位于库区蓄水位以下。深部监测数据显示消落带发育两条滑动错动面,分别位于距坡面深度12.0~17.0m和25.0~30.0m之间。滑坡目前处于蠕滑变形阶段,受地形地貌、地层结构、消落带劣化以及水的影响,垂直方向变形持续增大,前部劣化带发生崩滑破坏失稳可能性较大,并且存在滑坡涌浪灾害链风险。建议持续开展库区消落带劣化系统观测研究,提升库区新生滑坡灾害识别与预警能力。
This paper take the JiaodingfengⅡlandslide in Wushan County of the Three Gorges Reservoir area as an example and combines the reservoir water level changes and geological environment conditions data.It analyzes the deformation characteristics,formation mechanism and development trend of the landslide in detail.It uses field survey and mapping,UAV,engineering geological drilling,surface and deep displacement monitoring and other techniques.The volume of the landslide is about 250×10^(4)m^(3).It is a large monoclinal neogenic bedrock landslide.The height difference between the front and rear edges of the landslide is about 380m.The leading-edge shear outlet is high and steep and is located below the reservoir water level.The deep monitoring data show that there are two sliding zone in the water-level-fluctuation zone.The two zones are located between 12.0~17.0m and 25.0~30.0m from the slope.At present,the landslide is in the creep deformation stage.Under the influence of landform,stratigraphic structure,deterioration of the water-fluctuation zone and water,the vertical displacement continues to increase.The front deterioration zone has a high possibility of sliding failure and instability,and there is a risk of landslide surge disaster chain.It is suggested to carry out continuous observation and research on the deterioration system of the fluctuation zone in the reservoir area to improve the ability of identification and early warning of new landslide disasters in the reservoir area.
作者
朱赛楠
殷跃平
黄波林
张枝华
王平
王文沛
赵慧
张晨阳
ZHU Sainan;YIN Yueping;HUANG Bolin;ZHANG Zhihua;WANG Ping;WANG Wenpei;ZHAO Hui;ZHANG Chenyang(China Institute of Geo-environment Monitoring,China Geological Survey,Beijing 100081,China;Hubei Key Laboratory of Disaster Prevention and Mitigation,China Three Gorges University,Yichang 443002,China;Hydrogeology&Engineering Team 208,Chongqing Bureau of Geological Exploration(Chongqing Reconnaissance and Design Academy of Geological Disasters Prevention and Treatment Engineering),Chongqing 400714,China;Wuhan Centre of China Geological Survey,Wuhan 430074,China)
出处
《工程地质学报》
CSCD
北大核心
2021年第3期657-667,共11页
Journal of Engineering Geology
基金
国家重点研发计划项目(资助号:2018YFC1504803,2018YFC1505404)
中国地质调查局项目(资助号:DD20190637,DD20190647).
关键词
三峡库区
单斜顺层新生滑坡
软弱夹层
岩体劣化
失稳机理
Three Gorges Reservoir
Monoclinal layered neogenic bedrock landslide
Weak intercalation
Rock mass degradation
Instability mechanism
作者简介
第一作者:朱赛楠(1984-),男,博士,高级工程师,主要从事工程地质与地质灾害等研究.E-mail:6057817@qq.com;通讯作者:殷跃平(1960-),男,博士,研究员,主要从事工程地质与地质灾害等研究.E-mail:jcyyinyueping@mail.cgs.gov.cn。
