Influence of Confining Pressure on Water Retention Characteristics of Compacted Soil

Roy, S.; Rajesh, S.

doi:10.1007/s40098-017-0265-3

Cited by 10 publications

(2 citation statements)

References 22 publications

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“…Some scholars compared the measured values of the unsaturated permeability coefficient with the calculated values of the CCG model. The results showed that the CCG model had higher goodness of fit [58].…”

Section: Prediction Of Unsaturated Permeability Coefficientmentioning

confidence: 96%

Effects of Different Degrees of Hydrophobic Treatment on Soil–Water Characteristic Curves and Infiltration Coefficients of Hygroscopic Soils

Zhou

Chen

et al. 2022

Coatings

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Soil treated with silicone hydrophobic material for a long time can effectively improve the saturated permeability of the ground, which has been confirmed. However, the long time will increase the cost in engineering construction. Secondly, the mechanism of alteration of soil–water properties by silicone hydrophobic materials is not understood. This lack of understanding is not conducive to the engineering application of silicone hydrophobic materials. Therefore, variable-head permeability and matrix suction tests under 15 different test conditions were conducted with different hydrophobic material dosage and action time as variables in this paper. The soil–water characteristic curve (SWCC) was plotted according to the test results, the unsaturated permeability coefficient was calculated, and curve fitting was performed. It can be seen from the test data that, with the increase in the dosage of hydrophobic materials and the action time, the permeability coefficient and the air-entry value showed a downward trend. Nevertheless, as the reaction proceeded, a mutation occurred at 4 h. When the minimum dosage and action time were used, the soil’s permeability coefficient and air-entry value decreased by 80.65% and 71.09%. The test results show that, even when the action time was 2 h, the hydrophobic material could maintain the permeability of the soil and reduce its air-entry value; thus, the hydrophobic material could effectively reduce the rise of capillary water in the soil and protect the roadbed.

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Section: Prediction Of Unsaturated Permeability Coefficientmentioning

confidence: 96%

Effects of Different Degrees of Hydrophobic Treatment on Soil–Water Characteristic Curves and Infiltration Coefficients of Hygroscopic Soils

Zhou

Chen

et al. 2022

Coatings

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“…Pham and Fredlund [16] developed a gravimetric SWCC equation considering volume changes and further utilized the model to fit the soil suction-gravimetric water content data of different soils. Roy and Rajesh [17] measured suction-water content data of slurry and compacted soils from tensiometers and dew point potentiometer. Further, five classical SWCC models were used to fit and evaluate the significant parameters of different models in the full suction range.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Soil‐Water Characteristic Curve in Fractal and Empirical Models

Tao

Chen

Xiao

et al. 2020

Advances in Materials Science and Engineering

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The fitting analysis of soil-water characteristic curve (SWCC) is the foundation of engineering properties of unsaturated soils. The purpose of this paper is to explore the differences of fitting effects between different fractal and empirical models as well as the effect of residual water content θr on the model fitting. The experimental SWCCs of Hunan clay at different initial dry densities are measured by pressure plate instrument, and then they are fitted by fractal and empirical models. The effect of the limit of θr on the fitting results is analyzed by comparing the results of indoor evaporation test. The results show that within the measured data point range, fractal model II-2 and van Genuchten model (VG model) have the best fitting effect, fractal models I and II-1 take the second place, and the fitting effect of Gardner model is the worst. When the matrix suction is more than the measured data, the fitting accuracy of the model is poor. For the model with θr, reasonable limit range of θr can only improve the fitting accuracy of the model to a certain extent. For the fractal model, the fitting accuracy of the model can be improved effectively when θr is considered. Furthermore, the difference of fractal dimension and air-entry value in various fractal models are also discussed in this paper.

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Disturbed state concept and non-isothermal shear strength model for unsaturated soils

Pham

Sütman

2022

Bull Eng Geol Environ

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Shear strength of unsaturated soils is an important engineering property that is required for addressing geotechnical problems, the prediction of which remains to be a challenging task for design engineers due to the complex interaction problem. This study presents a new shear strength equation based on the micromechanical model and the disturbed state concept for unsaturated soils. The original point of this study is considering the solid contact area ratio which was neglected in most of the existing equations. Using the proposed model, the non-linear relationship between the matric suction, saturation degree, and the shear strength of unsaturated soils are described. Validation of the shear strength model was verified against the experimental data and several current models on six different types of soils. The results indicate that the proposed model has a good performance in predicting the shear strength of unsaturated soils, and generally is better than other existing models. In response to varying climatic conditions, the analytical model was then extended to consider the effect of temperature on the shear strength of unsaturated soils. The comparison between predicted and measured results was carried out on compacted silt for three different temperatures. The results show that the proposed model is capable of accurately predicting changes in unsaturated shear strength as a function of temperature.

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Influence of Confining Pressure on Water Retention Characteristics of Compacted Soil

Cited by 10 publications

References 22 publications

Effects of Different Degrees of Hydrophobic Treatment on Soil–Water Characteristic Curves and Infiltration Coefficients of Hygroscopic Soils

Effects of Different Degrees of Hydrophobic Treatment on Soil–Water Characteristic Curves and Infiltration Coefficients of Hygroscopic Soils

Comparative Analysis of Soil‐Water Characteristic Curve in Fractal and Empirical Models

Disturbed state concept and non-isothermal shear strength model for unsaturated soils

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