Efficient approach in modeling the shear strength of unsaturated soil using soil water retention curve

Cavalcante, André Luís Brasil; Mascarenhas, Pedro Victor Serra

doi:10.1007/s11440-021-01144-6

Cited by 25 publications

(14 citation statements)

References 29 publications

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“…When the soil becomes unsaturated, the rate of increase in shear strength with an increase in suction decreases, and the shear strength decreases to a constant value after reaching a peak value with a further increase in suction. The same trend has been explained by [16] for sandy soils. This phenomenon cannot be explained by the equation proposed by [12], even when considering the nonlinearity of 𝜑𝜑 𝑏𝑏 .…”

Section: Introductionsupporting

confidence: 81%

Comparison of the Shear Strength of Unsaturated Sandy Soils at Optimal and Residual Moisture Contents

Ahmad¹

2023

GEOMATE

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The shear strength of soil is a key input parameter required for the satisfactory geotechnical design of any structure. The existence of most residual soils in unsaturated conditions highlights the importance of studying the shear strength of unsaturated soils. In this study, a modified triaxial apparatus was used to examine the mechanical behavior of 5 types of silica sands with mean grain sizes varying from 0.15 to 1.5 mm. The experimental test results of soil shear strength determination were compared with the shear strength estimated through analytical methods. To study the mechanical behavior of test soils at optimal and residual moisture contents, the test samples were initially prepared at the optimal moisture content. To study the effect of the initial moisture content on the mechanical behavior of test soils at the residual moisture content, the test samples were initially prepared at the optimal and residual moisture contents. Residual moisture content samples exhibited higher shear strength compared to optimal moisture content samples. Furthermore, the residual moisture content samples prepared at the optimal moisture content exhibited stronger mechanical behavior compared to the sample prepared at the residual moisture content. The analytical methods employed in this study were not able to accurately predict the shear strength of test soils at residual moisture content.

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Section: Introductionsupporting

confidence: 81%

Comparison of the Shear Strength of Unsaturated Sandy Soils at Optimal and Residual Moisture Contents

Ahmad¹

2023

GEOMATE

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“…These results show that it is theoretically feasible to obtain matric suction (ψ) from RH. SWCC, as an important hydraulic property, describes the relationship between soil content and matric suction, [53] which is measured in this article to evaluate the hydraulic property of unsaturated soil. The shear strength of soil, the important mechanical property of soil, [54][55][56] is significantly influenced by water content, which decreases as the water content increases due to the interaction between the soil and water, and the hydrophilic minerals in the soil will expand and disintegrate under water softening.…”

Section: Resultsmentioning

confidence: 99%

High‐Performance Humidity Sensor Based on CsPdBr₃Nanocrystals for Noncontact Sensing of Hydromechanical Characteristics of Unsaturated Soil

Huang

Shan

Xuan

et al. 2022

Physica Rapid Research Ltrs

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The humidity sensors based on metal halide perovskite have achieved outstanding improvement. However, there are few reports of perovskite nanocrystals for humidity sensors. Herein, CsPdBr3 nanocrystals with high surface‐to‐volume ratio are synthesized by the in situ spin‐coating method. Subsequently, the humidity sensor based on CsPdBr3 nanocrystals is prepared and the response mechanism is demonstrated to originate from the formation of the Pd––O bond on the surface by performing density functional theory calculation. The humidity sensor shows a fast response/recovery time of 0.68/2.43 s in a relative humidity range from 88.9%RH to 4.7%RH; the fast response/recovery properties are used to monitor human respiratory and noncontact switch. Moreover, the hydromechanical characteristics of unsaturated soil are obtained by noncontact testing with the humidity sensor for the first time in geological engineering, and the strong correlation between relative humidity and hydromechanical characteristics is revealed by mathematical derivation, which lays the theoretical foundation for the noncontact real‐time sensing of hydromechanical characteristics of unsaturated soil. These findings not only open the door to the development of perovskite nanocrystals materials for humidity measurement, but also offer a new method for nondestructive and real‐time test of the mechanical properties of soil in geological engineering.

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“…SWCCs have been used to estimate the hydraulic conductivity, shear strength, volume change, and aqueous diffusion functions of unsaturated soils (Thu et al, 2011). For such unsaturated soils, the general practice is to provide the SWCCs or soil-water retention curves (SWRCs), describing the relationship of an unsaturated soil moisture content change and its degree of saturation change with its total suction change, which affects its shear strength behaviour (Egeli and Pulat, 2011;Cavalcante and Mascarenhas, 2021).…”

Section: Rainfallmentioning

confidence: 99%

The Effect of Extreme Rainfall Events on Riverbank Slope Behaviour

Taib

Razali

et al. 2022

Front. Environ. Sci.

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Many slope failures take place during or after rainfall events. Landslides are one of the tragedies associated with slope failures and often lead to fatal accidents. A study on the effects of extreme rainfall on slope stability considering the historical rainfall data, slope characteristics and properties, and flow boundary conditions was undertaken. This study investigated the behaviour of the Sg Langat slope under the influence of extreme rainfall gathered from historical data. Sg Langat was selected as the research area because of its high riverbank failures. The focus of this study are as follows: 1) to determine the effect of slope angles on slope stability, 2) to assess the development of pore-water pressure based on the changing groundwater levels, and 3) to analyse the influence of extreme rainfall events on the slope behaviour via numerical modelling. This study enhances the understanding of certain slope conditions and contributes to the analysis of slope stability through numerical modelling, making it relatively convenient to observe the soil conditions for determining the slope stability of the research area in regards to the effect of extreme rainfall. The results were obtained with respect to the changes in the pore-water pressure and the factor of safety. It was observed that the pressure changes were different for every channel, demonstrating that the generation of negative pore-water pressure was not directly affected by the type of analysis and the rainfall infiltration alone. Moreover, the slopes on all channels presented were considered unstable because of the considerable changes in the negative pore-water pressure at a relatively shallow depth, causing soil strength reduction. The factor of safety recorded for Channel 1 was the lowest at 0.18, whereas Channel 3 had the highest factor of safety of 1.11 but was still considered unsafe as it fell below the standard safety margin of 1.3. Apart from the different rainfall intensities applied, the geometry of the slopes also affected the slope stability.

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Efficient approach in modeling the shear strength of unsaturated soil using soil water retention curve

Cited by 25 publications

References 29 publications

Comparison of the Shear Strength of Unsaturated Sandy Soils at Optimal and Residual Moisture Contents

Comparison of the Shear Strength of Unsaturated Sandy Soils at Optimal and Residual Moisture Contents

High‐Performance Humidity Sensor Based on CsPdBr₃Nanocrystals for Noncontact Sensing of Hydromechanical Characteristics of Unsaturated Soil

The Effect of Extreme Rainfall Events on Riverbank Slope Behaviour

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Efficient approach in modeling the shear strength of unsaturated soil using soil water retention curve

Cited by 25 publications

References 29 publications

Comparison of the Shear Strength of Unsaturated Sandy Soils at Optimal and Residual Moisture Contents

Comparison of the Shear Strength of Unsaturated Sandy Soils at Optimal and Residual Moisture Contents

High‐Performance Humidity Sensor Based on CsPdBr3Nanocrystals for Noncontact Sensing of Hydromechanical Characteristics of Unsaturated Soil

The Effect of Extreme Rainfall Events on Riverbank Slope Behaviour

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High‐Performance Humidity Sensor Based on CsPdBr₃Nanocrystals for Noncontact Sensing of Hydromechanical Characteristics of Unsaturated Soil