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Open AccessArticle

Seepage, Deformation, and Stability Analysis of Sandy and Clay Slopes with Different Permeability Anisotropy Characteristics Affected by Reservoir Water Level Fluctuations

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College of Water Conservancy and Hydro-power Engineering, Hohai University, Nanjing 210098, China
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Collaborative Innovation Center on Water Safety and Water Science, Hohai University, Nanjing 210098, China
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State Key Laboratory of Hydrology-Water Resource and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
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China Enfei Engineering Technology Co., Ltd., Beijing 100038, China
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Powerchina Chengdu Engineering Corporation Limited, Chengdu 610072, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(1), 201; https://doi.org/10.3390/w12010201
Received: 24 December 2019 / Revised: 7 January 2020 / Accepted: 8 January 2020 / Published: 10 January 2020
(This article belongs to the Section Hydrology)
Evaluation of slope stability under water level fluctuations is an important topic in the Three Gorges Reservoir (TGR) in China. However, most of the previous studies regarded slope soil as isotropic material, or only considered the influence of anisotropy ratio (kr = kx/ky) but ignored the anisotropy direction (α). Meanwhile, the pore pressure–stress coupling was rarely considered in the previous numerical simulations. In the present study, the SIGMA/W and SLOPE/W modules in Geo-studio are utilized to carry out the numerical simulation of Caipo slope under the drawdown of the reservoir water level, and the anisotropy ratio (kr) as well as the anisotropy direction (α) of two kinds of soils (clay and sand) are included. Results show that the anisotropy ratio kr and anisotropy direction α decrease the infiltration capacity of the soil, which increases the infiltration line hysteretic elevation (ILHE) as well as maximum horizontal displacement (MHD), and reduces the minimum safety factor (MSF). The slope toe firstly fails with the drawdown of water level. The influence of reservoir water level drop on seepage, deformation, and stability of the sand slope is less than that of the clay slope. For the sandy soil slope, it is not only necessary to consider the influence of kr, but also the influence of α. For the soil slope, we can only consider α in order to simplify calculation. View Full-Text
Keywords: pore pressure–stress coupling; permeability anisotropy; reservoir water level fluctuations; seepage characteristics; slope stability; numerical simulation pore pressure–stress coupling; permeability anisotropy; reservoir water level fluctuations; seepage characteristics; slope stability; numerical simulation
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Yu, S.; Ren, X.; Zhang, J.; Wang, H.; Wang, J.; Zhu, W. Seepage, Deformation, and Stability Analysis of Sandy and Clay Slopes with Different Permeability Anisotropy Characteristics Affected by Reservoir Water Level Fluctuations. Water 2020, 12, 201.

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