Article
Engineering, Geological
Qian Zhai, Weimin Ye, Harianto Rahardjo, Alfrendo Satyanaga, Guoliang Dai, Xueliang Zhao
Summary: In the high suction zone, the hydraulic conductivity of unsaturated soil may increase with an increase in soil suction, and water mainly moves in soil in the vapor form. The proposed theoretical method for estimating vapor conductivity from the soil-water characteristic curve is rational and has been validated against experimental results and published literature.
ENGINEERING GEOLOGY
(2021)
Article
Engineering, Chemical
Longtan Shao, Shixiong Wu, Xiaoxia Guo, Tiande Wen
Summary: This paper studies the hydraulic characteristics of unsaturated soil and derives a theoretical formula for the one-dimensional infiltration rate of unsaturated soil by analyzing the pore water stress of the soil. The formula has fewer parameters and is easy to use compared to other models.
Article
Soil Science
You Gao, Ze Li, De'an Sun, Haihao Yu
Summary: Reliable estimation of unsaturated soil hydraulic properties is crucial for various research and engineering projects. The study evaluated hydraulic hysteresis and permeability of unsaturated soil with different void ratios or bulk densities. Results showed that the proposed hysteresis model effectively describes the drying, wetting, and scanning curves at different void ratios, and the permeability model predicts the relative permeability coefficient accurately.
SOIL & TILLAGE RESEARCH
(2021)
Article
Engineering, Geological
Sannith Kumar Thota, Toan Duc Cao, Farshid Vahedifard
Summary: The paper introduces the concept of Poisson's ratio characteristic curve (PRCC) to establish the relationship between Poisson's ratio and degree of saturation. Through calibration and validation, the proposed model can accurately predict the behavior of soils, leading to more accurate assessments in geotechnical engineering applications.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2021)
Article
Engineering, Geological
J. Zhang, S. Yang, L. L. Zhang, M. L. Zhou
Summary: This paper suggests a hybrid method based on Bayes' theorem to estimate the soil-water characteristic curve (SWCC). The suggested method combines empirical methods and measured data to provide the best estimate of SWCC while accounting for the associated uncertainty.
CANADIAN GEOTECHNICAL JOURNAL
(2022)
Article
Computer Science, Interdisciplinary Applications
Tuan A. Pham, Gabriela M. Medero, Melis Sutman
Summary: This paper presents a thermohydro-mechanical coupled model of the elastic modulus characteristic curve (EMCC) based on the effective stress theories of unsaturated soils. The proposed model uses the soil-water characteristic curve (SWCC) and the modulus of elasticity under saturated conditions to predict the variation of modulus of elasticity with matric suction for unsaturated soils. The successful prediction performance of the proposed model is demonstrated by comparing measured and predicted outcomes for various published data sets related to different soil types.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
Qian Zhai, Harianto Rahardjo, Alfrendo Satyanaga, Yiyao Zhu, Guoliang Dai, Xueliang Zhao
Summary: Rainfall-induced slope failures are mainly caused by infiltrated rainwater reducing soil shear strength. This study proposes a method for estimating the hydraulic conductivity function (HCF) of unsaturated soil during the wetting process based on the drying soil-water characteristic curve (SWCC). The estimation considers ink-bottle and rain-drop effects on the hysteresis of SWCC and was verified using experimental data from published literature.
ENGINEERING GEOLOGY
(2021)
Article
Engineering, Environmental
Chuang Zhang, Jianzhong Li, Yuxin Zhang, Tianyang Hu
Summary: The effect of suction stress on effective stress, shear strength, and the relationship with the soil-water characteristic curve of unsaturated reticulated red clay was explored through tests and simulations. The results showed that suction stress had a significant influence on effective stress, and there was an internal relationship between the suction stress characteristic curve and the soil-water characteristic curve.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Computer Science, Interdisciplinary Applications
Wenjing Qin, Guisheng Fan, Hongxing-Li
Summary: This study measured the water-retention curves of undisturbed loess soil samples with different soil textures, and obtained the parameters of the van Genuchten soil-water equation. A model for predicting the parameters of the water-retention curve in the low water potential range was established using an improved Support Vector Machine method. The results showed high consistency between the predicted values and the experimental data.
EARTH SCIENCE INFORMATICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Zhiqiang Lin, Jiangu Qian, Zhenhao Shi
Summary: This study introduces a novel model to estimate the shear strength of expansive soils. Experimental results show a linear relationship between capillary suction stress and shear strength, but the friction angle contributed to shear strength is different from the internal friction angle of saturated soils.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Civil
Gaoliang Tao, Yi Li, Lisheng Liu, Chuheng Zhong, Henglin Xiao, Chenchen Luo
Summary: This study proposes a new method for simultaneously measuring the soil-water characteristic curve and unsaturated permeability coefficient of clay in Hunan. The research results show that within a certain range of matric suction, the greater the dry density of the soil, the smaller the unsaturated permeability coefficient.
JOURNAL OF HYDROLOGIC ENGINEERING
(2022)
Article
Engineering, Geological
Tuan A. A. Pham, Melis Sutman
Summary: The paper proposes a simple and effective model to predict the combined effect of initial density and temperature on the soil-water characteristic curve (SWCC) and to be able to quantify the changes in thermal-hydro-mechanical behavior of unsaturated soils. The model is validated against several test data sets available in the literature, showing good performance in predicting the variation in SWCC with arbitrary temperature and initial density.
Article
Engineering, Environmental
Xu Li, Shuang-Fei Zheng, Meng Wang, A-Qiang Liu
Summary: Soil-water characteristic curve (SWCC) and soil freezing characteristic curve (SFCC) describe the water-holding characteristics of the soil during drying (or wetting) and freezing (or thawing), respectively. A theoretical model based on the Clapeyron equation is established to clarify the relationship between SWCC and SFCC, and it is validated by laboratory test results for several soils. The results indicate that the proposed model has wide adaptability and can easily predict SWCC from SFCC, addressing the problem of time-consuming. Additionally, it can also predict SFCC from SWCC, overcoming the difficulty in measuring SFCC accurately for coarse soil due to the lack of high-precision temperature control methods.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Civil
Qian Zhai, Gang Tian, Weimin Ye, Harianto Rahardjo, Guoliang Dai, Shijun Wang
Summary: Loess soils are widely distributed in the northwest zone in China and many steep slopes are naturally stable. However, the slope stability analysis following local code practices may not accurately reflect the real condition. This study investigates the effects of unsaturated shear strength and unit weight on the computed factor of safety (FoS) of unsaturated soil slopes, and finds that an increase in slope angle leads to an increase in the influence of unsaturated unit weight on the FoS.
GEOMECHANICS AND ENGINEERING
(2022)
Article
Computer Science, Interdisciplinary Applications
Yao Li, Sai K. Vanapalli
Summary: This study introduces two new equations to link soil pore structure to the soil-water characteristic curve, with one providing detailed information about bimodal SWCC and the other offering a flexible and simple curve-fitting process. A technique was also developed to estimate key features of bimodal SWCC without bias.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Geological
M. J. Rezaei-Hosseinabadi, M. Bayat, B. Nadi, A. Rahimi
Summary: This study aimed to evaluate the lateral load capacity of steel slag granular columns reinforced with geosynthetic and found that using steel slag columns with geosynthetic reinforcement can improve the lateral load capacity of soil. The results indicated the viability of using steel slag column as a soil reinforcement providing sustainable and technical benefits mainly when using geosynthetic reinforcement.
GEOMECHANICS AND GEOENGINEERING-AN INTERNATIONAL JOURNAL
(2022)
Article
Environmental Sciences
Yongmin Kim, Harianto Rahardjo, Margarit Mircea Nistor, Alfrendo Satyanaga, Eng-Choon Leong, Aaron Wai Lun Sham
Summary: This study explores the critical rainfall scenarios affecting slope stability in Singapore and concludes that slopes with low permeability soil are mainly affected by the 5-day rainfall scenario, while slopes with high permeability soil are mainly affected by the maximum daily rainfall scenario in Singapore.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Editorial Material
Engineering, Geological
K. R. I. P. A. UPRETI, ENG-CHOON LEONG, C. H. R. I. S. T. O. S. VRETTOS
Editorial Material
Engineering, Geological
E. C. Leong
INTERNATIONAL JOURNAL OF GEOTECHNICAL ENGINEERING
(2022)
Article
Engineering, Geological
Yi Lu, Hossam Abuel-Naga, Eng-Choon Leong, Wei-Guo Jiao, Xing Wang
Summary: This study investigates the interface creep behavior between geomembrane and geotextile in the liner system. The results show that the textured geomembrane and nonwoven geotextile have a larger interface friction angle. The creep displacement can be estimated using a power equation, and longer duration creep tests are recommended for a better understanding of the mechanism.
GEOTEXTILES AND GEOMEMBRANES
(2022)
Article
Engineering, Geological
Nurly Gofar, Alfrendo Satyanaga, Robby Yussac Tallar, Harianto Rahardjo
Summary: This research aims to investigate the stability of residual soil slopes in tropical countries under arid and damp conditions. The study utilizes actual evaporation and rainfall as boundary conditions to analyze the impact of actual evaporation on pore-water pressure distribution and factor of safety variation in the slope.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2022)
Article
Engineering, Geological
Hengshuo Liu, Harianto Rahardjo, Hejun Du, Abdul Halim Hamdany
Summary: In this study, the mechanism of water pressure decay in osmotic tensiometers (OTs) was explored using crosslinked poly(acrylamide-co-acrylic acid) potassium salt (PAM-co-PAAK) as the polymer material. The results showed that the pressure decay of OT was mainly caused by the stress relaxation of the polymer hydrogels, and the standard linear solid (SLS) rheological model was suitable for fitting the decay data. The research also demonstrated that the pressure decay was not due to polymer leakage, as there was no increase in polymer concentration during the decay period.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Engineering, Geological
Yangyang Li, Harianto Rahardjo, Alfrendo Satyanaga, Saranya Rangarajan, Daryl Tsen-Tieng Lee
Summary: Excessive rainwater infiltration can cause slope and tree uprooting failures. Early warnings and stabilization measures are crucial for high-risk slopes and trees. To identify high-risk areas, seepage, slope, and tree stability analyses are necessary, and a soil database is needed to account for the spatial variability of soil properties.
ENGINEERING GEOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Xuebo Li, Tianlun Shen, Ke Xiang, Qian Zhai, Harianto Rahardjo, Alfrendo Satyanaga, Shijun Wang
Summary: Rainwater infiltration is influenced by the soil-water characteristic curve (SWCC) and hydraulic conductivity function (HCF) of soil, both of which exhibit hysteresis during drying and wetting processes. Different seepage results can be obtained by incorporating different hydraulic conductivity functions in numerical simulations. Currently, there is no study that has verified the results from seepage analyses using the wetting HCF estimated from the wetting SWCC. This study investigates the influence of wetting SWCC and wetting HCF on 1-D water infiltration and suggests using wetting SWCC and wetting HCFPSDF as input information for numerical simulations.
Article
Construction & Building Technology
Mohammad Javad Rezaei-Hosseinabadi, Meysam Bayat, Bahram Nadi, Arezoo Rahimi
Summary: This study investigates the lateral load capacity of steel slag granular column-soil composites and finds that using steel slag columns can significantly improve the lateral load-bearing performance of soil.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Engineering, Environmental
Arezoo Rahimi, Harianto Rahardjo
Summary: The unsaturated permeabilities of different kaolin-sand mixtures were directly measured, and soil-water characteristic curves were also measured to validate the estimated values of permeability using theoretical models. The results showed that the estimated permeability models could reasonably fit the directly measured data when using measured and estimated SWCC data.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Green & Sustainable Science & Technology
Abdul Halim Hamdany, Martin Wijaya, Alfrendo Satyanaga, Harianto Rahardjo, Zhai Qian, Aswin Lim, Jong Kim
Summary: Soil suction is important for slope stability, but quantifying its impact is challenging due to its dependence on precipitation and evapotranspiration. Numerical simulation can estimate suction changes due to rainfall and evaporation, but accurate input parameters are crucial. Monitoring suction is important for validating numerical simulation, and the osmotic tensiometer developed by NTU allows monitoring of high suction levels. This study proposed a procedure to estimate suction changes in residual soil using rainfall and evapotranspiration data, and numerical simulation accurately captured variations at greater depths.
Article
Green & Sustainable Science & Technology
Weiguo Wang, Guoliang Dai, Jiabei Wei, Arezoo Rahimi, Qian Zhai
Summary: This study conducted statistical analyses to investigate the impact of post-grouting on the bearing behavior of bored piles. The results demonstrate that post-grouting can significantly improve the bearing capacity of piles. This research is expected to provide technical guidance for post-grouting in foundation engineering.
Article
Engineering, Geological
Yan Zhao, Harianto Rahardjo, Alfrendo Satyanaga, Qian Zhai, Jie He
Summary: The soil-water characteristic curve (SWCC) is a crucial property in unsaturated soil mechanics, and many theories and equations have been developed to describe and fit SWCC with unimodal or bimodal characteristics. This study proposes a general best-fitting equation for SWCC with multimodal characteristics (bimodal and trimodal SWCC). The equation's parameters are closely related to soil properties and SWCC variables. Testing with a trimodal SWCC soil mixture and published data shows that the proposed equation accurately fits bimodal and trimodal SWCC.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2023)
