Influence of Initial Water Content and Specimen Thickness on the SWCC of Fine-Grained Soils

Iyer, Kannan K. R.; Jayanth, Sneha; Gurnani, Seema; Singh, Devendrá

doi:10.1061/(asce)gm.1943-5622.0000265

Cited by 28 publications

(7 citation statements)

References 38 publications

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“…The relationship between the matric suction, ψ , and the amount of water in soil (gravimetric water content, ω , volumetric water content, Θ , or degree of saturation, S r ) is described by the soil‐water characteristic curve (SWCC) (Buckingham, 1907). The SWCC depends on the mineral composition, particle size distribution, initial water content, void ratio, stress history, and other factors (Iyer et al., 2012; Vanapalli et al., 1999). Some unsaturated soil properties, including the shear strength (D. G. Fredlund et al., 1978, 1996; Ng et al., 2016; Vanapalli et al., 1996), deformation (Alonso et al., 1990; Miller et al., 2008; Ng et al., 2002; H. Q. Pham et al., 2005), hydraulic conductivity (Mualem, 1976), and aqueous diffusion (Lim et al., 1998), are related to the SWCC.…”

Section: Introductionmentioning

confidence: 99%

A Hysteretic Model Considering Contact Angle Hysteresis for Fitting Soil‐Water Characteristic Curves

Liao

Chai

et al. 2021

Water Resources Research

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Section: Introductionmentioning

confidence: 99%

A Hysteretic Model Considering Contact Angle Hysteresis for Fitting Soil‐Water Characteristic Curves

Liao

Chai

et al. 2021

Water Resources Research

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“…The SWCC describes a relationship between water content or degree of saturation and suction in the soil. It is influenced by many complex factors such as initial water content [4,5], particle size distribution [6,7], stress state [8], and temperature [9]. The initial water content and grain-size distribution will influence the initial portion and slope, respectively.…”

Section: Introductionmentioning

confidence: 99%

Uncertainty of the Soil–Water Characteristic Curve and Its Effects on Slope Seepage and Stability Analysis under Conditions of Rainfall Using the Markov Chain Monte Carlo Method

Liu

Luo

Huang

et al. 2017

Water

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Abstract:It is important to determine the soil-water characteristic curve (SWCC) for analyzing slope seepage and stability under the conditions of rainfall. However, SWCCs exhibit high uncertainty because of complex influencing factors, which has not been previously considered in slope seepage and stability analysis under conditions of rainfall. This study aimed to evaluate the uncertainty of the SWCC and its effects on the seepage and stability analysis of an unsaturated soil slope under conditions of rainfall. The SWCC model parameters were treated as random variables. An uncertainty evaluation of the parameters was conducted based on the Bayesian approach and the Markov chain Monte Carlo (MCMC) method. Observed data from granite residual soil were used to test the uncertainty of the SWCC. Then, different confidence intervals for the model parameters of the SWCC were constructed. The slope seepage and stability analysis under conditions of rainfall with the SWCC of different confidence intervals was investigated using finite element software (SEEP/W and SLOPE/W). The results demonstrated that SWCC uncertainty had significant effects on slope seepage and stability. In general, the larger the percentile value, the greater the reduction of negative pore-water pressure in the soil layer and the lower the safety factor of the slope. Uncertainties in the model parameters of the SWCC can lead to obvious errors in predicted pore-water pressure profiles and the estimated safety factor of the slope under conditions of rainfall.

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“…Previous researchers have studied the influencing factors of the SWCC. The initial dry intensity [7][8], specimen thickness [9], initial water content [10], and grain size distribution [11]of the soils have significant influence on the SWCC. Romero [12] explored and revealed the effects of net normal stress and stress paths on SWCC.…”

Section: Introductionmentioning

confidence: 99%

Experiment and Modeling of Soil-Water Characteristic Curve of Unsaturated Soil in Collapsing Erosion Area

Liu

Luo

Ming-fu

et al. 2016

Pol. J. Environ. Stud.

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Soil erosion tends to occur with rainfall runoff, thus leading to grave soil and water loss. An increase of water content in soil caused by rain makes the loss of matrix suction and the decrease of shear strength obvious, and will promote soil erosion. The soil-water characteristic curve (SWCC) can be used to describe the relationship between the water content and the matrix suction in unsaturated soil. For this paper we studied the SWCCs of the granite residual soils in a collapsing erosion area in Jiangxi Province, China. A GEO-Experts pressure plate extractor was used to measure SWCCs for soils with different dry density, grain size, drying and wetting cycles, and lime content. The initial dry density has a significant impact on SWCC. With increasing dry density, the suction was decreased for the same water content. The larger the grain size, the greater the suction value for the same volumetric water content. Under the same suction, the volumetric water content decreases as the lime percentage increases and water stability improves. SWCCs of the drying and wetting cycle demonstrate the hysteresis phenomenon. The area of the hysteresis loop decreased with the increase of the dry density and drying and wetting cycle number. It also became small when the soils were mixed with lime. In this paper, the Van Genuchten model, the Fredlund and Xing model, and the Gardner model were used to fit the experimental data of SWCCs. The presented fitting parameters show that the residual sum of squares is less than 0.002. All the experimental data fit well to three models for SWCC. The results indicated that the simulated value of the Gardner model does provide best agreement with the measured value. These results will provide an important basis for the further study of the soil collapsing erosion process and soil cover design.

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Influence of Initial Water Content and Specimen Thickness on the SWCC of Fine-Grained Soils

Cited by 28 publications

References 38 publications

A Hysteretic Model Considering Contact Angle Hysteresis for Fitting Soil‐Water Characteristic Curves

A Hysteretic Model Considering Contact Angle Hysteresis for Fitting Soil‐Water Characteristic Curves

Uncertainty of the Soil–Water Characteristic Curve and Its Effects on Slope Seepage and Stability Analysis under Conditions of Rainfall Using the Markov Chain Monte Carlo Method

Experiment and Modeling of Soil-Water Characteristic Curve of Unsaturated Soil in Collapsing Erosion Area

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