| 长江三峡库区木鱼包滑坡地表变形规律分析 |
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| 引用本文： | 邓茂林,易庆林,韩蓓,周剑,李卓骏,张富灵.长江三峡库区木鱼包滑坡地表变形规律分析[J].岩土力学,2019,40(8):3145-3152. |
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| 作者姓名： | 邓茂林 易庆林 韩蓓 周剑 李卓骏 张富灵 |
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| 作者单位： | 1. 三峡大学 防灾减灾湖北省重点实验室，湖北 宜昌 443002；2. 三峡大学 三峡库区地质灾害教育部重点实验室，湖北 宜昌 443002；
3. 三峡大学 湖北长江三峡滑坡国家野外科学观测研究站，湖北 宜昌 443002 |
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| 基金项目： | 国家重点研发计划（No. 2018YFC1504803）；国家自然科学基金青年科学基金（No. 41502291，No. 41602301）；防灾减灾湖北省重点实验室（三峡大学）开放基金（No. 2018KJZ03）；三峡库区地质灾害教育部重点实验室基金（No. 2017KDZ07）；湖北省自然科学基金面上项目（No. 2018CFB654）。 |
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| 摘 要： | 三峡库区木鱼包滑坡自2006年实施专业监测以来，一直持续变形，对三峡大坝工程和长江航道造成巨大威胁。通过多次野外地质调查资料、长期现场巡查、人工GPS位移监测数据、近1年的全自动监测数据等，深入分析该滑坡在库水涨落及降雨条件下的变形特征、演化规律及变形机制。结果表明，滑坡坡体结构、岩性及地质构造等地质因素控制了木鱼包滑坡的变形，库水位是主要的驱动因素。库水位上升过程中，库水位由145 m升到155 m左右，月位移量为最小值；动水压力向坡内，滑坡变形最小；库水位155 m上升至175 m期间，库水入渗前部坡体，对滑坡前部抗滑段形成浮托减重效应，变形有所增加。库水位由175 m下降到170 m左右，累积位移形成阶跃，坡受向坡外动水压力和浮托减重效应作用，月位移达最大值。库水位由170 m降到145 m期间，浮托减重效应作用减小，月位移量降低。目前，木鱼包滑坡变形趋势减小，产生大规模滑动的可能性较小，但须进一步加强监测和机制研究。
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| 关 键 词： | 木鱼包滑坡 位移阶跃 浮托减重效应 变形规律 |
| 收稿时间： | 2018-05-11 |
Analysis of surface deformation law of Muyubao landslide in Three Gorges reservoir area |
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| DENG Mao-lin,YI Qing-lin,HAN Bei,ZHOU Jian,LI Zhuo-jun,ZHANG Fu-ling.Analysis of surface deformation law of Muyubao landslide in Three Gorges reservoir area[J].Rock and Soil Mechanics,2019,40(8):3145-3152. |
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| Authors: | DENG Mao-lin YI Qing-lin HAN Bei ZHOU Jian LI Zhuo-jun ZHANG Fu-ling |
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| Institution: | 1. Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang, Hubei 443002, China; 2. Key Laboratory of
Geological Hazards on Three Gorges Reservoir Area of Ministry of Education, China Three Gorges University, Yichang, Hubei 443002, China;
3. National Field Observation and Research Station of Landslides in Three Gorges Reservoir Area of Yangtze River,
China Three Gorges University, Yichang, Hubei 443002, China |
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| Abstract: | The results of professional monitoring implemented in 2006 shows the Muyubao landslide in Three Gorges reservoir area has been continuously deformed, which brings a huge threat to the Three Gorges Dam Project and the Yangtze River Channel. Qualitative analysis indicates that the reservoir water level plays a key role in the surface deformation of the landslide. Through many field geological survey data, long-term on-site inspection, artificial GPS displacement monitoring data, and automatic monitoring data for nearly one year, the deformation characteristics, evolution law and deformation mechanism of the landslide under reservoir water fluctuation and rainfall conditions are analysed in depth. The results show that the geological factors such as landslide slope structure, lithology and geological structure control the deformation of Muyubao landslide, and the reservoir water level is the main driving factor. During the rise of the reservoir water level, when the reservoir water level rises from 145 m to 155 m, the monthly displacement is the minimum; when the hydrodynamic pressure is towards inside slope, the landslide deformation is the smallest; when the reservoir water level rises from 155 m to 175 m, the reservoir water infiltrates the front slope, which leads to form a floating weight-reducing effect on the anti-sliding section in front of the landslide and increases the deformation. When the reservoir water level reduces from 175 m to 170 m, the monthly displacement reaches the maximum value and the cumulative displacement forms a step, which is affected by the dynamic water pressure and the floating weight loss effect of the slope. When the reservoir water level decreases from 170 m to 145 m, the floating weight loss effect is reduced and the monthly displacement is reduced. At present, the deformation trend of the Muyubao landslide is less, and the possibility of large-scale sliding is smaller, but the monitoring and mechanism research must be further strengthened. |
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| Keywords: | Muyubao landslide displacement step weight loss effect on floating conveyor deformation law |
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