朱赛楠, 殷跃平, 黄波林, 等. 2021. 三峡库区大型单斜顺层新生滑坡变形特征与失稳机理研究[J]. 工程地质学报, 29(3): 657-667. doi: 10.13544/j.cnki.jeg.2021-0178.
    引用本文: 朱赛楠, 殷跃平, 黄波林, 等. 2021. 三峡库区大型单斜顺层新生滑坡变形特征与失稳机理研究[J]. 工程地质学报, 29(3): 657-667. doi: 10.13544/j.cnki.jeg.2021-0178.
    Zhu Sainan, Yin Yueping, Huang Bolin, et al. 2021. Deformation characteristics and instability mechanism of large monoclinal layered neogenic bedrock landslide in Three Gorges Reservoir area[J]. Journal of Engineering Geology, 29(3): 657-667. doi: 10.13544/j.cnki.jeg.2021-0178.
    Citation: Zhu Sainan, Yin Yueping, Huang Bolin, et al. 2021. Deformation characteristics and instability mechanism of large monoclinal layered neogenic bedrock landslide in Three Gorges Reservoir area[J]. Journal of Engineering Geology, 29(3): 657-667. doi: 10.13544/j.cnki.jeg.2021-0178.

    三峡库区大型单斜顺层新生滑坡变形特征与失稳机理研究

    DEFORMATION CHARACTERISTICS AND INSTABILITY MECHANISM OF LARGE MONOCLINAL LAYERED NEOGENIC BEDROCK LANDSLIDE IN THREE GORGES RESERVOIR AREA

    • 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250×104 m3,为大型单斜顺层新生岩质滑坡。滑坡前后缘高差约380 m,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12.0~17.0 m和25.0~30.0 m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。

       

      Abstract: This paper take the Jiaodingfeng Ⅱ landslide 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 250×104 m3. It is a large monoclinal neogenic bedrock landslide. The height difference between the front and rear edges of the landslide is about 380 m. 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 12.0~17.0 m and 25.0~30.0 m 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.

       

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