Effects of hydraulic conductivity/strength anisotropy on the stability of stratified, poorly cemented rock slopes

Dong, Jia Jyun; Tu, Chih-Ho; Lee, Wong Ru; Jheng, Yun Jia

doi:10.1016/j.compgeo.2011.11.001

Cited by 33 publications

(13 citation statements)

References 11 publications

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“…The anisotropy coefficient not only has great influence on the transient seepage, but it also has an impact on the safety factor of the slope. According to Mahmood et al [37], the difference of slope safety factors between considering and not considering soil anisotropy is about 40% [38]. However, most of the previous studies ignored the seepage anisotropy of slope soil, and the research results of soil anisotropy of slopes were few and incomplete.…”

Section: Introductionmentioning

confidence: 99%

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

Ren

Zhang

et al. 2020

Water

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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.

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Section: Introductionmentioning

confidence: 99%

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

Ren

Zhang

et al. 2020

Water

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“…The values of the anisotropic ratio for alluvium range from 2 to 10 and that for clay soil can be higher than 100 [35]. Dong and Hsu [36] used a numerical model to estimate the effect of hydraulic conductivity anisotropy on the stability of stratified, poorly cemented rock slopes. They showed that neglecting hydraulic conductivity anisotropy resulted in overestimation of the safety factor of the slope by about 40%.…”

Section: Introductionmentioning

confidence: 99%

Analyzing the Effect of Soil Hydraulic Conductivity Anisotropy on Slope Stability Using a Coupled Hydromechanical Framework

Yeh

Tsai

2018

Water

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In studies on the effect of rainfall on slope stability, soil hydraulic conductivity is usually assumed to be isotropic to simplify the analysis. In the present study, a coupled hydromechanical framework based on transient seepage analysis and slope stability analysis is used to investigate the effects of hydraulic conductivity anisotropy on rainfall infiltration and slope safety at various slope locations (the top of the slope, the slope itself and the toe of the slope). The results show that when the vertical hydraulic conductivity (K y) is constant, the horizontal hydraulic conductivity (K x) increases (i.e., anisotropy increases). This occurs because rainfall tends to infiltrate into the interior of the slope, resulting in the soil on top of the slope and on the slope itself being easily influenced by rainfall, leading to soil instability. The change of rainfall infiltration at the slope itself is the most significant. When the anisotropic ratio K r (=K x /K y) increased from 1 to 100, the depth of the wetting zones for loam, silt and clay slopes increased by 23.3%, 33.3% and 50%, respectively. However, increased K r led to a slower infiltration rate in the vertical direction at the toe of the slope. Compared to the results for K r = 1 and for K r = 100, the thickness of the wetting zones at the toe of loam and silt slopes decreased by 23.3% and 30.0%, respectively. For the clay slope, K r changes did not significantly affect the wetting zones because of poor permeability. The results of this study suggest that the effect of soil hydraulic conductivity anisotropy should be considered when estimating slope stability to better understand the effect of rainfall on slopes.

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“…slope angle, length, aspect, gradient and curvature, and the weather conditions, these slopes become unstable and make serious geologic hazards. Around the world, landslide depends on the geological characteristics, hydrological condition and rainfall distribution [2,3]. In Malaysia, significant numbers of slope failure are reported on manmade and residual soil slopes especially at the time of high intensity rainfall due to rapid change of soil properties, particularly physical properties, such as bulk density, cohesiveness and shear strength [4].…”

Section: Ecological Approaches To Stabilize Slopementioning

confidence: 99%

Contribution of Vegetation to Alleviate Slope’s Erosion and Acidity

Osman¹,

Saifuddin²,

Halim³

2014

Environmental Risk Assessment of Soil Contamination

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Effects of hydraulic conductivity/strength anisotropy on the stability of stratified, poorly cemented rock slopes

Cited by 33 publications

References 11 publications

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

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

Analyzing the Effect of Soil Hydraulic Conductivity Anisotropy on Slope Stability Using a Coupled Hydromechanical Framework

Contribution of Vegetation to Alleviate Slope’s Erosion and Acidity

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