引用本文:张龙飞,杨宏伟,李曜男,李嘉祺,吴益平.库水与降雨对凉水井滑坡变形及稳定性的影响[J].水利水运工程学报,2019,(2):16-24
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库水与降雨对凉水井滑坡变形及稳定性的影响
张龙飞1, 杨宏伟2, 李曜男3, 李嘉祺1, 吴益平1
1.中国地质大学(武汉)工程学院, 湖北武汉;2.中南冶金地质研究所, 湖北宜昌;3.中国市政工程中南设计研究总院有限公司, 湖北武汉
摘要:
三峡库区内大量的涉水库岸边坡,其稳定性不仅受库水涨落的影响,而且还受到库区降雨的影响。为了分析凉水井滑坡在库水下降及降雨联合作用下的变形与稳定性响应规律,利用Geostudio有限元软件分析了8种不同工况下凉水井滑坡的变形特征与稳定性演化规律,定义并获取了滑坡各处的降雨响应因子与联合响应因子。变形结果表明,滑坡前缘变形主要受库水下降控制,而后缘变形则受控于降雨;库水降雨联合作用时滑坡表现出牵引式的运动特征,且在滑坡中后部出现了一个变形响应“迟钝”的区域。稳定性分析表明,滑坡稳定性主要受库水下降控制,其稳定系数随下降速度的增加而降低。但当库水下降速度大于0.6 m/d时,随着库水下降速度增加滑坡稳定系数的降幅逐渐减小,库水下降速度大于1.0 m/d时,库水下降速度的增加对稳定性影响较小,其稳定性对50年一遇的暴雨更加敏感。
关键词:  凉水井滑坡  库水降雨联合作用  库水降速  变形特征  稳定性评价
DOI:
分类号:P642.22
基金项目:国家自然科学基金资助项目(41572278)
Influence of reservoir water and rainfall on the Liangshuijing landslide deformation and stability
ZHANG Longfei1, YANG Hongwei2, LI Yaonan3, LI Jiaqi1, WU Yiping1
1.Facultly of Engineering, China University of Geosciences, Wuhan;2.Central South Institute of Geology and Metallurgy, Yichang;3.Central and Southern China Municipal Engineering Design and Research Institute Co., Ltd., Wuhan
Abstract:
There are many bank slopes in the Three Gorges Reservoir area, and the stability of these slopes is affected by both the variation of the reservoir water level and the abundant rainfall in the reservoir area. To study the response law of deformation and stability of the Liangshuijing landslide under reservoir water drawdown and rainfall, based on GeoStudio finite element software, the deformation characteristics and stability evolution laws of the Liangshuijing landslide under eight different conditions were analyzed. The rainfall response factor and the joint response factor of the landslide were defined and extracted. The deformation results show that the front edge deformation of the landslide is controlled mainly by the drawdown of the reservoir water, while the back edge is affected mainly by rainfall. A tractive movement characteristic of the landslide is shown when taking the combined effect of reservoir water drawdown and rainfall into consideration, and this characteristic is evident in the middle and back areas of the landslide where the deformation response is much smaller than that in other areas. The stability analysis indicates that the stability of the landslide is controlled mainly by the reservoir water drawdown. The stability of the landslide decreases as the water drawdown velocity increases; however, the scale of stability decline decreases gradually when the drawdown velocity exceeds 0.6 m/d. When the velocity is greater than 1.0 m/d, the increase of drawdown velocity has little effect on the stability, and the stability is more sensitive to the 50 year rainstorm, which provides a certain basis for prevention and control of the Liangshuijing landslide.
Key words:  Liangshuijing landslide  reservoir water and rainfall combined effect  drawdown velocity  deformation characteristic  stability analysis
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