Article
Engineering, Geological
Pratiksha Pandey, Kaine Lynch, Vinayagamoorthy Sivakumar, Brian Solan, Snehasis Tripathy, Satyajeet Nanda, Shane Donohue
Summary: This study aimed to develop a novel approach for measuring the saturated and unsaturated permeability of soils, using low-humidity air circulation through a slender sand column at the center of samples to generate suctions, and measuring suctions with two tensiometers located at the base of the samples.
Article
Engineering, Geological
Zi Ying, Yu-Jun Cui, Nadia Benahmed, Myriam Duc
Summary: In this study, the effect of soil salinity on the compaction behaviour of soil was investigated through standard Proctor compaction tests. The results showed that as soil salinity decreased, maximum dry density increased, optimum water content decreased, and G(max) also decreased. Pore size distribution exhibited bi-modal characteristics and the effect of salinity varied in different compaction states.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Mahnoosh Biglari, Iman Ashayeri, Domenico Gallipoli, Sara Moradpour
Summary: This model proposed in the paper calculates the small-strain shear stiffness of saturated and unsaturated fine-grained soils through the introduction of a reference saturated state and functions of key parameters. It simplifies the calibration process and shows good predictive capabilities in laboratory experiments.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Soil Science
Matheus P. S. Toledo, Mario M. Rolim, Renato P. de Lima, Roberta Q. Cavalcanti, Pedro F. S. Ortiz, Mauricio R. Cherubin
Summary: The study found that in sugarcane fields, an increase in soil organic carbon content led to a decrease in soil strength, while an increase in compactness resulted in higher soil strength. Additionally, an increase in silt + clay content significantly increased soil compressibility.
SOIL & TILLAGE RESEARCH
(2021)
Article
Engineering, Geological
Qing-Yi Mu, Bao-Lin Dai, Chao Zhou
Summary: A new elastoplastic model for isotropic structured soils under saturated and unsaturated conditions was developed in this study, which incorporated the influence of soil structure on the loading collapse curve and its evolution during structure degradation. The model was successfully validated by simulating the behavior of structured and unsaturated soils along different suction and stress paths.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2023)
Article
Engineering, Environmental
S. Bulolo, E. C. Leong, R. Kizza
Summary: The study discusses the effects of drying and wetting cycles on soil, particularly in relation to crack formation and tensile strength. Existing tensile strength models for unsaturated soils were found to have limitations, leading to the proposal of a new model that can be applied to both coarse-grained and fine-grained soils. The new model was shown to outperform existing models in terms of performance.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Engineering, Geological
Mozhen Hu, Yu-Jun Cui, Yunzhi Tan
Summary: The compaction curve of lime-treated metakaolin exhibits an uncommon 1.5-peak shape, while untreated metakaolin shows a common single-peak curve. Both treated and untreated samples compacted at dry and wet conditions show unimodal pore-size distribution characteristics, indicating the absence of aggregates. Soil stiffness is mainly influenced by particle contacts or dry density, with suction having a minimal effect.
CANADIAN GEOTECHNICAL JOURNAL
(2021)
Article
Engineering, Civil
Ali Murtaza Rasool, Jiro Kuwano
Summary: The paper presents results of an experimental investigation on the instability of unsaturated slopes under constant deviatoric stress in drained conditions. It is found that soil behavior is significantly affected by variation in compaction degree and confining stress during water infiltration, with low net confining stress leading to large collapse deformation in loose soil. Additionally, the stability of slopes is enhanced with increased compaction degree, as indicated by an increase in the gradient of the failure line.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF CIVIL ENGINEERING
(2022)
Article
Computer Science, Interdisciplinary Applications
Guo-qing Cai, Yan-lin Su, An-nan Zhou, Feng-jie Yin, Ye-hui Shi
Summary: This paper presents a novel elastic-viscoplastic constitutive model for reproducing the time-dependent behavior of unsaturated soil. The model combines the theoretical framework of the Unified Hardening model and the Barcelona Basic Model with Perzyna's overstress theory. It considers the effect of loading history and suction, and accurately describes the shear, dilatancy, and compression behaviors of unsaturated soil with different initial void ratios and stresses. Experimental data validates the capability of the proposed model in reproducing the time-dependent behavior of unsaturated soil or soft rock.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
Houman Soleimani-Fard, Diethard Koenig, Meisam Goudarzy
Summary: This research evaluated the shear strength parameters of fine-grained soils, finding that ductile behavior was more noticeable in samples with lower suctions and higher straw contents. The shear strength significantly increased with an increase in suction, and the shear band inclination was influenced by both suction and straw content.
Article
Energy & Fuels
Sannith Kumar Thota, Farshid Vahedifard
Summary: This study presents a closed-form model to determine the matric suction in unsaturated soils under undrained heating. The model is validated with experimental data for clay, silt, and sand, showing a high level of prediction accuracy.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Geological
Zi Ying, Nadia Benahmed, Yu-Jun Cui, Myriam Duc
Summary: This study utilized a chilled-mirror dew-point hygrometer and contact filter paper method to determine total and matric suctions in low-plasticity soils, introducing a new piecewise function to calculate osmotic suction. Results indicated good agreement between calculated osmotic suction and indirectly measured data, suggesting that transforming EC and concentrations is a viable alternative for low-plasticity soils.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Engineering, Geological
M. Ge, J. Pineda, D. Sheng
Summary: This paper explores the contributions of wetting and associated volume change to the small-strain shear stiffness, G(0), in compacted loess. The results show that the effects of wetting and plastic deformation on G(0) are strongly controlled by the stress level. Below the compaction stress, suction effects dominate and G(0) reduces regardless of the collapse strain. With increasing stress level, the reduction in G(0) caused by saturation is compensated by plastic deformation triggered by soil collapse. Once the compaction stress is exceeded, volume change becomes dominant and G(0) tends to increase upon wetting. The change in G(0) varies linearly with stress level, independent of compaction conditions.
GEOTECHNIQUE LETTERS
(2023)
Article
Engineering, Civil
Guangyu Dai, Fei Zhang, Yuke Wang
Summary: This study presents stability analyses of layered soil slopes in unsaturated conditions and determines the factor of safety involving suction stress of unsaturated soil using a limit equilibrium method. The obtained results show that larger suction stress provided in unsaturated clay dominates the stability of the layered slopes, while the location and thickness of the clay layer have significant influences on slope stability.
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2022)
Article
Engineering, Environmental
Wugang Li, Qing Yang, Zhijia Xue, Wenhua Liu, Yuan Hua
Summary: The study presents a simple method to investigate the mechanical behavior of unsaturated soils during compression, controlling the saturation level, and validates the approach through experimental data and numerical simulations. The results show that the proposed method can effectively control the saturation level and accurately reproduce the mechanical and hydraulic responses of unsaturated soils.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Green & Sustainable Science & Technology
Safoura Salehi, Mehrdad Arashpour, Jayantha Kodikara, Ross Guppy
Summary: The use of waste plastics in asphalt mixtures as binder modifiers can help solve waste management problems and reduce environmental impacts. The contribution of each stage in the production of plastic pellets from waste plastics is identified, with waste collection management playing a crucial role in minimizing resource consumption and related impacts. Reprocessed plastics modified asphalt offers an environmentally friendly alternative under appropriate conditions.
JOURNAL OF CLEANER PRODUCTION
(2022)
Review
Construction & Building Technology
Suthakaran Sivagnanasuntharam, Arooran Sounthararajah, Javad Ghorbani, Didier Bodin, Jayantha Kodikara
Summary: This paper investigates the current state of knowledge of compaction testing methods for asphalt and identifies their limitations. Intelligent compaction can ensure uniformity and provide real-time feedback. However, the current specifications are not suitable for asphalt compaction, and GPR technology shows potential for asphalt density estimation.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Engineering, Civil
Guoyang Fu, Benjamin Shannon, Rukshan Azoor, Jian Ji, Ravin Deo, Jayantha Kodikara
Summary: This paper examines the performance of deteriorated cast iron pipes lined with polymeric liners using probabilistic analysis. It is found that the coefficients for the rupture strength and the creep retention factors of the liners are most influential on the probability of failure of the lined pipes.
STRUCTURE AND INFRASTRUCTURE ENGINEERING
(2023)
Article
Engineering, Geological
Amir Tophel, Jeffrey P. Walker, Troyee Tanu Dutta, Jayantha Kodikara
Summary: This paper introduces a theory-guided machine learning framework for predicting compaction density under cyclic loading, combining theoretical models and machine learning algorithms. The TGML framework showed reduced error and model uncertainty in simulating compaction behavior.
Article
Engineering, Geological
Rukshan Azoor, Ravin Deo, Benjamin Shannon, Guoyang Fu, Jian Ji, Jayantha Kodikara
Summary: The research examined the influence of soil heterogeneity on the corrosion of underground metallic pipelines and found that the degree of saturation and saturated soil resistivity are the most influential variables. An artificial neural network was trained and validated to predict corrosion rates based on these variables. The study revealed that the spatial variability of degree of saturation significantly affects the maximum corrosion patch size, depth, and frequency of occurrence.
Article
Construction & Building Technology
Suthakaran Sivagnanasuntharam, Arooran Sounthararajah, Didier Bodin, Jayantha Kodikara
Summary: This paper presents a novel equation, called the 'STKAR equation', for real-time prediction of the average in-depth temperature of asphalt layers during compaction. The equation utilizes the measured surface temperature and estimated temperature gradient at the asphalt surface. The developed equation was validated using temperature data obtained from a construction site and numerical simulations. The results showed the effectiveness and applicability of the STKAR equation.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2023)
Review
Environmental Sciences
Z. Zimar, D. Robert, A. Zhou, F. Giustozzi, S. Setunge, J. Kodikara
Summary: Expansive clays are commonly found worldwide and can cause damage to pavements due to their volume change. Fly ash stabilisation is an effective method to treat these clays. This review examines the properties of fly ash and its effects on various clay types, concluding that using 15% class C fly ash with 7 days of curing is recommended for optimal performance.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Geological
Arunodi Abeyrathne, Chathurika Jayasundara, Susanga Costa, Jayantha Kodikara
Summary: The coexistence of air and water in void spaces in unsaturated soils makes its mechanical behavior complex, and understanding the behavior patterns of unsaturated soils is crucial. This study evaluates the deviatoric behavior of compacted unsaturated soils in q - v(w) - p space, and finds a critical state surface for compacted unsaturated soils in this space.
Article
Construction & Building Technology
Arooran Sounthararajah, Jayantha Kodikara
Summary: This study investigates the effect of specimen size on the flexural fatigue behavior of cement-stabilized pavement materials. The results show the existence of a fatigue endurance limit in these materials and indicate that specimen size has a significant impact on the flexural properties of cement-stabilized Holcim road base.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2022)
Article
Geochemistry & Geophysics
Thi Mai Nguyen, Jeffrey P. Walker, Nan Ye, Jayantha Kodikara
Summary: In passive microwave remote sensing, the estimation of surface roughness parameter is a major obstacle for soil moisture retrieval. This study investigates the effects of incidence angle and soil moisture on the relation between surface roughness and the surface roughness parameter. A modified surface roughness parameter model is developed, taking into account these two factors to improve the accuracy of soil moisture retrieval.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Construction & Building Technology
Suthakaran Sivagnanasuntharam, Arooran Sounthararajah, Jayantha Kodikara
Summary: The main aim of this paper is to analyze and compare different intelligent compaction measurement values (ICMVs) with spot test measurements for asphalt pavement. A two-layer asphalt testbed was constructed and all ICMVs were calculated using the same accelerometer data. The analysis showed strong correlations between certain ICMVs, but none of them showed acceptable correlation with asphalt densities. A correction method for the influence of underlying support on one of the ICMVs was developed and validated.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2023)
Article
Construction & Building Technology
Suthakaran Sivagnanasuntharam, Arooran Sounthararajah, Jayantha Kodikara
Summary: This study investigates the correlations between asphalt density, intelligent compaction measurement values (ICMVs), and asphalt moduli under different temperature conditions. The research findings indicate that the influence of asphalt density on its modulus is primarily controlled by the temperature of the asphalt mix. Additionally, ICMVs were found to be insensitive to changes in asphalt density at typical compaction temperatures. A practical approach for maximizing the benefits of intelligent compaction technology in quality control/quality assurance of asphalt pavements is proposed, involving the overlaying of ICMV maps and surface temperature maps to identify vulnerable regions for density testing.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Proceedings Paper
Engineering, Civil
Ehsan Yaghoubi, Mahdi M. Disfani, Arul Arulrajah, Jayantha Kodikara, Asmaa Al-Taie
Summary: This research investigates the unsaturated mechanical characteristics of recycled geomaterials and develops a virgin compaction surface (VCS) to interpret the volume change of compacted materials. The outcomes extend the application of a traditional framework and offer a relatively simple testing methodology utilizing conventional geotechnical equipment.
ADVANCES IN TRANSPORTATION GEOTECHNICS IV, VOL 3
(2022)
Proceedings Paper
Computer Science, Information Systems
Chathurika Jayasundara, Ravin N. Deo, Jayantha Kodikara
INFORMATION TECHNOLOGY IN GEO-ENGINEERING
(2020)
Article
Geochemistry & Geophysics
Thi Mai Nguyen, Jeffrey P. Walker, Nan Ye, Jayantha Kodikara
Summary: This study investigated the influence of environmental conditions on microwave brightness temperature measurements in a warehouse with concrete and steel construction. The results showed that the built environment significantly affected the TB observed by the sensor and indoor measurements could not be directly used for reliable soil moisture retrieval. The environment correction equation provided substantial improvement in estimating soil moisture from indoor measurements.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
