Role of Bimodal Water Retention Curve on the Unsaturated Shear Strength

Satyanaga, Alfrendo; Bairakhmetov, Nail; Kim, Jong Ryeol; Moon, Sung-Woo

doi:10.3390/app12031266

Cited by 17 publications

(12 citation statements)

References 42 publications

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“…The transient SEEP/W analysis was selected, and the water table served for initial pore-water pressure and head conditions. The initial rate changed from 1 to 0.65 to improve the convergence rate in the iteration calculation [16].…”

Section: Methodsmentioning

confidence: 99%

“…There should be noted that the length of the top and bottom sides of the slope is 3 times the height of the slope. It is an appropriate value to avoid the effect of boundary conditions from the left side and right sides of the numerical model since raindrops may infiltrate to nearby soil on both sides [16]. Different angles and heights of slopes were used for further comparison.…”

Section: Methodsmentioning

confidence: 99%

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Effect of slope geometry on stability of slope in Almaty

et al. 2023

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Landslides bring destruction to buildings, and nearby located structures and mostly occur in rural areas. Such hazard commonly takes place in mountainous areas in Central Asia. Kazakhstan region has highly vulnerable areas to rainfall-induced landslides in South-Eastern parts due to presence of many mountains. The purpose of the research is to demonstrate the effect of slope geometry on slope stabilityunder heavy rainfall in Almaty, Kazakhstan. Transient seepage analyses were conducted using Seep/W while limit equilibrium slope stability analyses were performed using Slope/W. 15 sets of numerical analyses were carried out on different slope angle and slope height incorporating the soil-water characteristic curve and unsaturated permeability and unsaturated shear strength of soil from Almaty. According to the obtained simulation results in GeoStudio software for seepage analysis, the pore-water pressure is increased almost for 80 kPa at the mid slope of each simulation. The change of FoS for the gentlest slope with 27 degrees slope angle is the lowest for 10 m slope height and the highest for 30 m slope height, whereas the change of FoS for slope with 45 degrees of slope angle (9%) is almost the same for all slope height.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effect of slope geometry on stability of slope in Almaty

et al. 2023

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“…This analysis reveals a direct relationship between matric suction and volumetric water content, whereby an increase in matric suction corresponds to a decrease in volumetric water content [13]. Furthermore, A. Satyanaga et al [14] have clarified that when measuring the water retention curve, it is crucial for the water volume to attain a state of equilibrium before increasing the matric suction to a higher level. The experiment demonstrated that a significant reduction in water volume is occasionally not consistent with the air entrance value of the specimen in terms of suction.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Soil-water Retention Characteristics for Unsaturated Soil Using Coconut Shell Waste for Subgrade Improvement

Hafiz,

Kechik,

Ibrahim

et al. 2024

TOCIEJ

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Introduction Suction distribution has a major impact on the stability of unsaturated soil because it affects seepage and shear strength. The Air Entry Value (AEV) and Residual Water Content (RWC) variations determine the Soil-Water Characteristic Curve (SWCC), which is a crucial component of suction distribution. The subgrade is submerged in water during a flood event, which has an impact on the AEV and RWC, and lowers their performance. Crushed Coconut Shell (CCS), a waste product, has been recycled in this study and used as an addition to increase subgrade strength by enhancing AEV and RWC. Currently, researchers abroad confirm that CCS improves subgrade performance. Nevertheless, the optimum content of the soil-CCS mixture varies based on the soil type of the respective regions. Moreover, there is a lack of scholarly research examining the enhancement of AEV and RWC affected by CCS following a flood occurrence. Aim This research study sought to determine the deviations of AEV and RWC for the optimum CCS content of unsaturated soil in Malaysia. Methods In this research, control samples and soil mixed with 0.5, 1.0, 1.5, 2.0, and 2.5% of CCS were used. The pressure plate extractor equipment and analysis generate SWCC, which characterises the AEV and RWC parameters and quantifies the performance of submerged subgrade because of a flood event. Results The outcome revealed a significantly higher AEV for mixed soil as compared to the control sample. The AEV for the control sample was 10 kPa, whereas that for the optimum mixture of soil-CCS of 0.5% was 25 kPa. Therefore, it has been confirmed that the use of CCS has a positive impact on AEV and RWC. This, in turn, is expected to improve the overall performance of the subgrade when subjected to submersion in water. Conclusion The objective of this study was to assess the characteristics and potential applications of hazardous waste by transforming it into a soil improvement agent. This research supports Chapter 8 of the 12th Malaysia Plan 2021–2025: Environmental Sustainability: Improving Resilience to Climate Change and Disasters, and Chapter 6 of the Green Technology Master Plan Malaysia 2017–2030: Waste.

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“…It is well known that the shear strength of arable soil is governed by a range of soil properties, especially bulk density and water content [2,17]. Bulk density reflects the compactness of the soil's structure, and water content directly affects the Coulomb force, the van der Waals force between soil particles, as well as the connection mode and cementation between soil particles.…”

Section: Introductionmentioning

confidence: 99%

“…A portable CPT data measuring device that can quickly measure cone tip resistance and cone side pressure through one penetration operation was designed. Given that water content and bulk density have a clear influence on soil shear strength [2,17] and that they are easily obtained using the oven-drying method [35], these two soil properties were combined with the CPT data points for constructing the prediction models. To our knowledge, there are no studies that have explored predicting the soil shear strength parameters by combining CPT data and soil properties.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Soil Shear Strength Parameters Using Combined Data and Different Machine Learning Models

et al. 2022

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Soil shear strength is an important indicator of soil erosion sensitivity and the tillage performance of the cultivated layer. Measuring soil shear strength at a field scale is difficult, time-consuming, and costly. This study proposes a new method to predict soil shear strength parameters (cohesion and internal friction angle) by combining cone penetration test (CPT) data and soil properties. A portable CPT measuring device with two pressure sensors was designed to collect two CPT data in farmland, namely cone tip resistance, and cone side pressure. Direct shear tests were performed in the laboratory to determine the soil shear strength parameters for 83 CPT data collection points. Two easily available soil properties (water content and bulk density) were determined via the oven-drying method. Using the two CPT data and the two soil properties as predictors, three machine learning (ML) models were built for predicting soil cohesion and the internal friction angle, including backpropagation neural network (BPNN), partial least squares regression (PLSR), and support vector regression (SVR). The prediction performance of each model was evaluated using the coefficient of determination (R2), the root-mean-square error (RMSE), and the relative error (RE). The results suggested that among all the evaluated models, the BPNN model was the most suitable prediction model for soil cohesion, and the SVR model performed best in predicting soil internal friction angle. Thus, our findings provide a foundation for the convenient and low-cost measurement of soil shear strength parameters.

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Role of Bimodal Water Retention Curve on the Unsaturated Shear Strength

Cited by 17 publications

References 42 publications

Effect of slope geometry on stability of slope in Almaty

Effect of slope geometry on stability of slope in Almaty

Exploring the Soil-water Retention Characteristics for Unsaturated Soil Using Coconut Shell Waste for Subgrade Improvement

Prediction of Soil Shear Strength Parameters Using Combined Data and Different Machine Learning Models

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