Experimental study of stress-dependent soil-water characteristics and their applications on numerical analysis of slope stability

The soil-water characteristic curve (SWCC) is a widely used experimental means for assessing fundamental properties of unsaturated soils for a wide range of soil suction values. The study of SWCC is helpful because some properties of unsaturated soils can be predicted from it. Nowadays, much attention has been paid to the behaviours of highly compacted bentonite-sand mixtures used in engineering barriers for high level radioactive nuclear waste disposal. It is very important to study the various performances of bentonite-sand mixtures in order to insure the safety of high-level radioactive waste (HLW) repository. After an introduction to vapor phase method and osmotic technique, a laboratory study has been carried out on compacted bentonite-sand mixtures. The SWCC of bentonite-sand mixtures has been obtained and analyzed. The results show that the vapor phase method and osmotic technique is suitable to the unsaturated soils with high and low suction.

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Influences of gamma-ray irradiation on PVDF membrane behavior: An experimental study based on simulation and numerical analysis

Polymer Degradation and Stability ◽

10.1016/j.polymdegradstab.2021.109722 ◽

2021 ◽

Vol 193 ◽

pp. 109722

Author(s):

Yongqiang Guo ◽

Chao Liu ◽

Hongpeng Liu ◽

Wenjing Wang ◽

Hongbin Li ◽

...

Keyword(s):

Experimental Study ◽

Numerical Analysis ◽

Gamma Ray ◽

Membrane Behavior ◽

Pvdf Membrane ◽

Gamma Ray Irradiation

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Analysis of Rainfall Effect to Slope Stability in Ulu Klang, Malaysia

Jurnal Teknologi ◽

10.11113/jt.v72.4005 ◽

2015 ◽

Vol 72 (3) ◽

Cited By ~ 2

Author(s):

Muhammad Mukhlisin ◽

Siti Jahara Matlan ◽

Mohamad Jaykhan Ahlan ◽

Mohd Raihan Taha

Keyword(s):

Slope Stability ◽

Soil Water ◽

Rainfall Threshold ◽

Critical Threshold ◽

Water Index ◽

Triggering Factors ◽

Landslide Event ◽

Tropical Climates ◽

Fatal Landslides

Malaysia is a country that is located near the equator line with tropical climates which receives high abundant rainfall, averaging 2,400mm annually. This makes Malaysia prone to the landslide events as rainfall is one of the main triggering factors that can cause landslide. Landslides in Malaysia are mainly attributed to frequent and prolonged rainfalls, in many cases associated with monsoon rainfalls. Of these, Ulu Klang area has received the most exposure. The area has constantly hit by fatal landslides since December 1993. This paper is aimed to investigate the correlation between the effective working rainfall and soil water index (SWI) methods with the landslide events in Ulu Klang, Malaysia. In this study 15 landslide events that occurred in Ulu Klang areas between years 1993 to 2012 were investigated and analyzed using rainfall threshold based on effective working rainfall and soil water index (SWI) methods. The analysis results showed that these methods are significant tools that can be used to identify the rainfall critical threshold of landslide event.

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A relationship describing the shear strength of unsaturated soils

Canadian Geotechnical Journal ◽

10.1139/t98-102 ◽

1999 ◽

Vol 36 (2) ◽

pp. 363-368 ◽

Cited By ~ 33

Author(s):

Daud W Rassam ◽

David J Williams

Keyword(s):

Shear Strength ◽

Soil Water ◽

Nonlinear Regression ◽

Unsaturated Soils ◽

Characteristic Curve ◽

Three Dimensional ◽

Matric Suction ◽

Linear Increase ◽

Soil Water Characteristic Curve ◽

Stress Dependent

A relationship describing the shear-strength profile of a desiccating soil deposit is essential for the purpose of analysis, especially when a numerical method is adopted where each zone in a discretised grid is assigned an elevation-dependent shear-strength value. The matric-suction profile of a desiccating soil deposit is nonlinear. Up to the air-entry value, an increase in matric suction is associated with a linear increase in shear strength. Beyond air entry, as the soil starts to desaturate, a nonlinear increase in shear strength occurs. The soil-water characteristic curve is stress dependent, as is the shear-strength gain as matric suction increases. In this paper, a three-dimensional, nonlinear regression analysis showed that a power-additive function is suitable to describe the variation of the shear strength of unsaturated soils with matric suction. The proposed function incorporates the effect of normal stress on the contribution of matric suction to the shear strength.Key words: air-entry value, matric suction, nonlinear regression, soil-water characteristic curve, tailings, unsaturated shear strength.

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