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Journal of Geoengineering 2021年第1期16卷 23-34页

作者： Elsawy, Mohamed B.D. Geotechnical Engineering and Foundations Department of Civil Engineering Faculty of Engineering Tabuk University Tabuk Saudi Arabia Geotechnical Engineering and Foundations Department of Civil Engineering Faculty of Engineering Aswan University Aswan Egypt

The expansive soil and sand dunes are abundant in desert areas at which new cities have been constructed. One of the effectively mitigation techniques for the expansive soil is to mix it with a non-swelling soil. This paper aims to study the influence of different sand dunes fractions, varying from zero to 50%, on the behaviour of the highly expansive clay. The clay-sand mixtures were also chemically stabilized by 10% of lime. The samples were remoulded according to the modified AASHTO compaction tests results. Swelling and strength tests were performed on each mixture. The results showed that mixing sand dunes with expansive clay reduced its swell potential and swelling pressure. The reductions increased as the increment of sand fraction. The swell potential and swelling pressure of the clay reduced to approximately the one-third when utilizing 50% sand. But mixing lime and sand with clay caused further significant reductions in swell properties. The swell potential and the swelling pressure of the clay were approximately suppressed when it was stabilized by 50% sand and 10% lime. Adding sands to clays had a negative effect on the strength. The CBR and UCS values of the clay-sand mixture decreased with increasing sand fractions. Once adding lime to the clay-sand mixtures, the CBR and UCS after 8-weeks curing time increased. The increments raised with increasing of sand fraction. The existence and the increment of sand dunes in clay influenced effectively on the chemical reactions with lime. © 2021. All Rights Reserved.

关键词： Lime

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Sustainability of lime stabilized road subgrade in mountainous regions of Türkiye

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Journal of Mountain Science 2023年第8期20卷 2436-2452页

作者： Yavuz ABUT İlknur BOZBEY Ece KURT BAL Department of Transportation Engineering Faculty of EngineeringYalova UniversityYalova 77200Türkiye Geotechnical Engineering Division Civil Engineering DepartmentAvcilar CampusIstanbul University-CerrahpasaAvcilar/Istanbul 34320Türkiye Civil Eng. M.Sc.&Geoph.Eng.Sentez Geopier FoundationsIstanbul 34320Türkiye

In this paper the use of lime stabilized subgrade for low volume roads in two regions with high mountains and different frost penetration conditions in Türkiye was investigated in terms of design,performance,and *** on unstabilized and stabilized subgrade were designed for two regions(Izmir and Van),covering all climate *** resilient modulus of the lime stabilized subgrade with different soil pulverization levels for non-freezing and freezing conditions were taken from a previous laboratory *** effects were considered in pavement design using two different approaches,including limited subgrade frost penetration method and reduced subgrade strength *** application and evaluation were performed for all *** stabilized subgrades significantly reduced the thickness of base courses,and the benefit of lime stabilization was highly dependent on soil pulverization level.A detailed cost analysis on the unstabilized and stabilized cases found that the use of lime stabilization in the subgrade provided significant initial cost *** analysis by using the AASHTO(1993)method and KENPAVE software,and quantity effect of soil pulverization level on the performance of low volume roads from a service life perspective,show that subgrade resilient modulus can be *** is also possible to make correct performance estimation in the *** results of the study show that lime stabilization is a good solution for low volume roads in the mountainous regions of Türkiye.

关键词： Aggregate Surfaced Roads Lime Stabilization Soil Pulverization Levels Road Design Service Life Cost analyses

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Data-driven insights into geotribological shear behavior and friction prediction of geomaterial contacts

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Tribology International 2025年 210卷

作者： Kandpal, Lalit Vangla, Prashanth Matsumura, Satoshi Singh, Aryan Raj Dept. of Civil Engineering Indian Institute of Technology Delhi India Foundations Group Geotechnical Engineering Division Port and Airport Research Institute National Institute of Maritime Port and Aviation Technology Yokosuka Japan

Micromechanical shear studies are essential for advancing geotribological understanding and improving force prediction models for non-dilative interfaces. This study investigates the frictional behavior of geomaterial contacts through particle-scale interface shear tests using a custom-built micromechanical apparatus. Experiments were conducted on quartz sand particles with varying morphologies and continuum materials—high-density polyethylene (HDPE), polyvinyl chloride (PVC), and stainless steel (ST). The data-driven insights revealed material-specific friction trends: exponential increase for HDPE, power-law growth for PVC, and linear rise for ST, influenced by surface roughness and normal load. Furthermore, machine learning algorithms, particularly random forests, were applied to develop friction coefficient predictive models, effectively predicting interface friction angles with R² values of 0.94 for training and 0.89 for testing. © 2025 Elsevier Ltd

关键词： Micromechanics

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Consistency Classification of Alluvial Clayey Soils in the Nile Delta Based on Experimental Tests Using Machine Learning Models

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Indian geotechnical Journal 2025年

作者： Elsawy, Mohamed Lakhouit, Abderrahim Rabeiy, Ragab Shaban, Mahmoud Department of Civil Engineering Faculty of Engineering Geotechnical and Foundations Engineering at University of Tabuk Tabuk71491 Saudi Arabia Department of Civil Engineering Faculty of Engineering Geotechnical and Foundations Engineering at Aswan University Aswan81542 Egypt Department of Civil Engineering Faculty of Engineering Environmental Engineering at University of Tabuk Tabuk71491 Saudi Arabia Department of Civil Engineering College of Engineering Qassim University Buraidah51452 Saudi Arabia Faculty of Engineering Assiut University Assiut71515 Egypt Department of Electrical Engineering College of Engineering Qassim University Buraydah52571 Saudi Arabia Department of Electrical Engineering Faculty of Engineering Aswan University Aswan81542 Egypt

Building structures on clayey soil presents unique challenges to geotechnical engineers due to the inherent variability in clayey soil consistency. Understanding engineering properties of clayey soils is essential for accurate geotechnical design and the prevention of potential issues such as settlement and instability. The current study provides crucial insights for geotechnical assessments and engineering solutions in the area, highlighting key soil properties that affect the classification of clayey consistency. Advanced machine learning (ML) models were employed to predict the in situ clay consistency, a vital parameter for evaluating the deformation resistance of clayey soils under structures. The ML predictions are based on nine features representing the physical and mechanical properties of the clay, which are easily determined through laboratory and field evaluations. A dataset comprising 173 samples is compiled, which extracted from Nile Delta in Egypt, incorporating data on the basic properties of the soils to train and test several ML classification algorithms. The classification models, including logistic regression, k-nearest neighbors, support vector machine, random forest, and gradient boosting classifiers, are evaluated using metrics such as accuracy, sensitivity, specificity, and F1-score. The results demonstrate that the gradient boosting classifier model exhibits the highest accuracy in predicting clay class, achieving 97% and 86% accuracy for the training and testing datasets, respectively. These findings offer a valuable framework for efficiently and cost-effectively classifying clays, assisting geotechnical engineers in making informed decisions about foundation design and construction on clayey soils. Additionally, the study establishes equations to predict the undrained shear strength of clayey soil based on its basic properties, providing a practical and accurate method for estimating soil strength characteristics. These contributions enhanc

关键词： Well logging

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A Numerical Investigation of SSCB Analysis and the Possibility of Applying Arching Inducement Techniques 8

A Numerical Investigation of SSCB Analysis and the Possibili...

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8th International Conference on Case Histories in geotechnical engineering: Soil Erosion, Underground engineering, and Risk Assessment, Geo-Congress 2019

作者： Ezz, I.M. Akl, S.A.Y. El-Kholy, M. Geotechnical Engineering Soil Mechanics and Foundations Research Laboratory Faculty of Engineering Cairo Univ. Giza12311 Egypt

ISBN: (数字)9780784482155

ISBN: (纸本)9780784482155

This paper presents a numerical analysis of soil steel composite bridges (SSCBs). The bridge is a flexible steel corrugated sheet surrounded by carefully compacted backfill soil. The numerical analysis is performed using the finite element program PLAXIS 2D, and the results are then compared to the typically used Swedish design method (SDM). This analysis focuses on the Skivarpsån composite bridge case study in Sweden. The analysis compares the recorded field measurements of straining actions and vertical deflections with the SDM design approach predictions and numerical model results. Then, the paper investigates the use of arching inducement techniques to reduce straining actions on the steel body without compromising the serviceability of the roads above. Embedding layers of a deformable material such as Pneusol causes significant decrease in the straining actions in the steel sheet. Two patterns are suggested herein, which decreases the developed straining actions from 10% to 15%. © 2019 American Society of Civil Engineers.

关键词： Numerical methods

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Small-strain dynamic properties of sand-EPS bead mixtures 11

Small-strain dynamic properties of sand-EPS bead mixtures

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11th International Conference on Geosynthetics 2018, ICG 2018

作者： Ramadan, Safwat H. El-Sherbiny, Rami M. El-Khouly, Mohamed A. Geotechnical Research Centre University of Western Ontario Canada Cairo University Egypt Soil Mechanics and Foundations Research Lab. Faculty of Engineering Cairo University Egypt

ISBN: (纸本)9781713806080

Soil modified with Expanded Polystyrene beads results in lightweight mixtures used in many geotechnical applications. Investigating the dynamic behavior of such mixture may enhance its applications. This paper presents a laboratory characterization program using sand mixed with EPS particulates. The host sand was modified with up to 2.5% EPS beads by weight, which corresponds to approximately 70% EPS by volume. The paper focuses on the small strain dynamic properties of these composite mixtures at increasing percentages of beads and different confining pressures using Resonant Column tests. Results indicate that for each 0.5% increase in the beads content there is an average reduction of 12% in dry unit weight. The small strain dynamic properties show decreased shear stiffness with increasing EPS beads content and less influenced material damping with increasing the beads content. Overall, the laboratory evaluation of these sand-EPS bead mixtures resulted in properties that are within the range of engineering use and could be considered as an alternative construction material in various geotechnical applications. Copyright © 11th Inter. Conf. on Geos. 2018, ICG 2018. All rights reserved.

关键词： Mixtures

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Correction to: Intensity-dependent site amplification factors for Vrancea intermediate-depth earthquakes

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Bulletin of Earthquake engineering 2019年第5期17卷 2381-2381页

作者： Pavel, Florin Vacareanu, Radu Pitilakis, Kyriazis Seismic Risk Assessment Research Centre Technical University of Civil Engineering Bucharest Bucharest Romania Laboratory of Soil Mechanics Foundations and Geotechnical Earthquake Engineering Aristotle University of Thessaloniki Thessaloniki Greece

Co-author name typo-name to be read as “Kyriazis Pitilakis” instead of “Kyriazis Pitiliakis”.

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Soil Improvement by Mixing: Techniques and Performances

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Energy Procedia 2016年 85卷 85-92页

作者： Oana Caraşca Technical University of Civil Engineering Bucharest Faculty of Hydraulic Works Geotechnical Engineering and Foundations Department Lacul Tei Bvd. no. 122 – 124 District 2 Bucharest RO 020396 Romania

Soil treatment and stabilization by mixing, an economic and eco-friendly method, is a technique that is increasingly being used worldwide in order to improve soft soils. A better understanding of the physical and mechanical properties and behavior of the final product is of vital importance for optimizing the design of the mixing process, thus for further development of the mixing methods, there is a need for more extensive laboratory research. The overall objective of the study presented in this paper is to improve the understanding of some of the important aspects of the strength behavior of stabilized soils. An experimental program was carried out in the laboratory on different artificial soils, comprised of clay and sand stabilized with cement, in order to determine the unconfined compressive strength, flexion strength, porosity, density and dynamic modulus. The results of the tests are presented in relation to results obtained by other researchers, available in the literature.

关键词： Soil stabilization kaolin clay binder strength porosity

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Soil mass stability analysis using Euler-Lagrange coupling

Soil mass stability analysis using Euler-Lagrange coupling

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International Symposium on Coupled Phenomena in Environmental Geotechnics: From Theoretical and Experimental Research to Practical Applications

作者： Şerbulea, M.S. Andronic, A. Manoli, D.M. Priceputu, A. Department of Geotechnical Engineering and Foundations Technical University of Civil Engineering Bucharest Romania

ISBN: (纸本)9781138000605

The numerical modelling of the propagation phase of landslides surpasses the limits of classical Soil Mechanics, entering the Fluid Mechanics field. For modelling the displacements of fluid behaviour continuous masses, using the Finite Element Method, two approaches can be used: (1) Complete 3D formulations, where the mass equilibrium equations and the linear moment equations are solved in a time-dependent domain. These kinds of models require high computational resources and their usage is restricted to the cases where the fine structure of the flow, structure forces etc. are known. (2) Using the linear flow on the vertical direction under a conservative forces field hypothesis, it is possible to integrate the equilibrium equations on the vertical direction of the differential hydrostatic level, obtaining simple 1D models. The "depth integration" equations can be written using Euler or Lagrange formulation. The current paper presents the numerical modelling of the solid-liquid interaction and establishes a comparison between this method and the methods proposed by Ito-Matsui and Beer-Carpentier for calculating the optimum distance between the piles axes. © 2013 Taylor & Francis Group.

关键词： Numerical models

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Aspects on designing and monitoring a deep excavation for a highly important structure 18

Aspects on designing and monitoring a deep excavation for a ...

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18th International Conference on Soil Mechanics and geotechnical engineering, ICSMGE 2013

作者： Popa, H. Manea, S. Batali, L. Olteanu, A. Technical University of Civil Engineering of Bucharest Geotechnical and Foundations Department Romania

Building large and deep excavations in urban areas is always a complex problem. The geotechnical investigation should be very detailed and the design rigorous. As well, the monitoring of such a work is mandatory. The paper presents a retaining structure from Bucharest, Romania for a deep excavation of 66 x 127 m size in plan and a maximum depth of over 16 m. This open pit was required for building the infrastructure of the largest Cathedral in Romania, the National Redemption Cathedral. The paper presents aspects regarding the geotechnical investigations and interpretation, soil parameters, calculation of the diaphragm wall, anchors and dewatering system, as well as displacement monitoring.

关键词： Walls (structural partitions)

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