Numerical subarea of sensitive zone of monitoring variable of landslides to fluctuation of water level of Three Gorges Reservoir — a case of Xietan Landslide |
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| Authors: | ZHANG Zhen-hua LUO Xian-qi WU Jian LIU Si-chun WANG Zhi-jian |
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| Institution: | 1. Key Laboratory of Geological Hazards for Three Gorges Reservoir Area of Ministry of Education, China Three Gorges University, Yichang 443002, China:; 2. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;
3. Yichang Sanda Supervision Company of Engineering Construction, Yichang 443002, China |
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| Abstract: | In the period of impounding and running of the Three Gorges Reservoir, the sensitive degrees of change of groundwater table and displacement to the fluctuation of water level are different in different parts of landslides induced by the fluctuation of water level (as the case of Xietan Landslide). According to the relationship between different sensitive degrees of monitoring variables (underground water level and displacement) and quantity of monitoring information, the sensitive zones of groundwater table and displacement to the fluctuation of reservoir water level are divided into different degrees by the approach of fuzzy pattern recognition. The result of numerical subarea of sensitive zone of groundwater table and displacement indicates that the middle and front part of the landslide are the main places with groundwater table affected by the fluctuation of water level of reservoir; the variation of horizontal displacement of surficial part of the middle and front part of the landslide is more sensitive to water impounding and sudden fall of water level; and with the increase of elevation and depth of the landslide, the horizontal displacement changes less and less; the change of vertical displacement of surficial parts of the landslide is most sensitive to the fluctuation of water level of Three Gorges Reservoir; and with the increase of depth, the change of vertical displacement become smaller and smaller. By the means of the numerical subarea regulation of Xietan Landslide, the suggestions to the point layout for monitoring the groundwater table and displacement in the landside of Three Gorges Reservoir are put forward. |
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| Keywords: | fuzzy pattern recognition monitoring variables sensitive degree subarea layout of monitoring points |
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