Article
Engineering, Geological
Angelo Amorosi, Fabio Rollo, Yannis F. Dafalias
Summary: The study proposes a relationship between elastic anisotropy and plastic anisotropy in clayey soils, suggesting that they share the same directional ingredients at the microscale. Experimental measurements of both types of anisotropy can be used to address geotechnical boundary value problems effectively and efficiently.
Article
Engineering, Geological
Hesam Dejaloud, Mohammad Rezania
Summary: This paper presents an adaptive anisotropic constitutive model, AA1-CLAY, that can capture experimental yield points of different clay types with high accuracy. By incorporating an innovative rotational hardening rule, the model is able to control the yield surface rotation rate and realistically govern the effect of plastic strains at different constant stress ratios. The model's capabilities are demonstrated by comparing simulation results with experimental data for various clay types.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Mohammad Rezania, Hesam Dejaloud
Summary: A new multi-surface anisotropic constitutive model is proposed for clayey soils, which can more realistically simulate the nonlinear behavior of clays with high overconsolidation ratios by incorporating rotational hardening rule and non-associated flow rule into the model formulation. The model shows promising capabilities in capturing the important aspects of natural clays response during straining, particularly for the combined effects of small strain nonlinearity with fabric orientation.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Geological
O. T. Bentil, C. Zhou, Jun-hui Zhang, K. Liu
Summary: This study investigated the cross-anisotropic stiffness of compacted lateritic clay, finding that it has weaker dependency of shear modulus to confining pressure, higher shear modulus, and higher degradation rate of stiffness with strain compared to other clays. The lateritic clay behaves like granular material due to its large-size aggregated microstructure and 42% sand content, and anisotropy evolves during shearing.
CANADIAN GEOTECHNICAL JOURNAL
(2023)
Article
Computer Science, Interdisciplinary Applications
Pin Zhang, Zhen-Yu Yin, Brian Sheil
Summary: There is great potential for machine learning to improve constitutive modelling of geomaterials. However, a lack of interpretability and heavy reliance on big data has been a common criticism. This study proposes an interpretable data-driven approach for geotechnical modelling, incorporating prior knowledge and uncertainty. By adopting a multi-fidelity modelling framework, the impact of small datasets can be maximized. The results show that data-driven modelling with physical constraints performs robustly, even for extrapolation beyond the original dataset.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
Hesam Dejaloud, Mohammad Rezania
Summary: In this paper, an anisotropic non-associative constitutive model is developed for clays subjected to different loadings. The model uses a robust non-elliptical yield surface and a flexible plastic potential surface to accurately simulate soil stiffness and coefficient of earth pressure at rest. The evolution of the yield surface is controlled by a combination of conventional volumetric and comprehensive rotational hardening rules. A novel double-image stress point bounding surface plasticity type theory is used to capture nonlinear behavior and cyclic responses.
Article
Engineering, Geological
Zhiwei Gao, Andrea Diambra
Summary: This study proposes a full anisotropic model for fibre-reinforced sand in multiaxial stress space, taking into account the influence of fibre orientation on FRS behavior. The model is based on the deformation of the sand skeleton, the effect of fibre presence on the soil skeleton, and the relative orientation between loading direction and fibre orientation, without requiring direct measurement of individual fibre stress-strain relationships.
Article
Engineering, Geological
Qi-Yin Zhu, Pei-Zhi Zhuang, Zhen-Yu Yin, Hai-Sui Yu
Summary: This study introduces a two-surface constitutive model to describe the thermomechanical behavior of saturated fine-grained soils at different consolidation states, incorporating a thermal-dependent parameter relationship to consider the effects of temperature. The model establishes a nonlinear relationship and a simple flow rule based on experimental observations, and successfully validates against experimental results.
CANADIAN GEOTECHNICAL JOURNAL
(2021)
Article
Engineering, Geological
Zhenhao Shi, David Muir Wood, Maosong Huang, James P. Hambleton
Summary: Constitutive models constructed within the framework of kinematic hardening and bounding surface plasticity have been successful in describing the rate-independent deformation of soils. However, most soils exhibit rate-dependence in their deformation characteristics, making it important for the models to reproduce rate- or time-dependent patterns of response. This paper explores a constitutive modelling approach that incorporates multiple viscoplastic mechanisms to account for the rate-sensitive deformation of soils.
Article
Mechanics
Fabio Rollo, Angelo Amorosi
Summary: This paper examines the elastoplastic coupling phenomenon in solids, such as soils and rocks, from a thermodynamic-based constitutive modelling perspective. A new formulation considering isotropic and rotational hardening is proposed to illustrate two forms of isotropic and anisotropic elasto-plastic coupling for clays. The thermodynamic approach allows for a more detailed understanding of the phenomenon, particularly in terms of its effects on the yield domain and flow rules.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Engineering, Geological
K. Pan, T. T. Xu, D. Liao, Z. X. Yang
Summary: In this study, comprehensive asymmetrical cyclic loading tests were conducted to investigate the liquefaction responses of sand. The results showed that different stress conditions can lead to three distinct failure mechanisms. By developing an anisotropic sand model, the typical deformation, strength, and fabric characteristics of sand under different cyclic failure mechanisms could be accurately captured.
Article
Engineering, Geological
D. A. V. O. O. D. DADRAS-AJIRLOO, G. U. S. T. A. GRIMSTAD, S. E. Y. E. D. A. L. I. G. H. O. R. E. I. S. H. I. A. N. AMIRI
Summary: In this study, a thermodynamically based hyperplasticity framework was used to develop a hyper-viscoplastic constitutive model for describing clay's creep and rate-dependent behavior. The model complies with the concept of isotache viscosity and the paradigm of critical state soil mechanics.
Article
Engineering, Geological
Yangping Yao, Yichuan Tian, Wenjie Cui, Ting Luo, Shanshan Li
Summary: In this paper, a new yielding mechanism is introduced based on double-structure theory to extend the original UH model for unsaturated soils and capture the behavior of expansive clays. A novel expansion potential is established to evaluate the effect of overconsolidation on volume change during wetting. With only one additional parameter, the proposed model can accurately describe the wetting-collapse and wetting-induced swelling behavior of unsaturated clays. Comparison with test results confirms the capability of the model to characterize unsaturated expansive clays under different stress conditions.
Article
Engineering, Geological
Gustav Grimstad, Michael Long, Davood Dadrasajirlou, Seyed Ali Ghoreishian Amiri
Summary: This paper discusses the time evolution of K-0 in clay within the framework of hyper-viscoplasticity, highlighting the lack of data on the influence of creep and the existing models predicting minimal changes in K-0 with time, contrasting with practitioners' opinions of potential increases over time.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2021)
Article
Engineering, Geological
Hilmi Bayraktaroglu, Michael A. Hicks, Mandy Korff, Vahid Galavi
Summary: Experimental studies have shown that the initial fabric and its evolution under different stress paths have a significant impact on soil behavior. Even though different sample preparation methods result in different inherent anisotropies and material responses, the same initial fabric structure under different stress paths also leads to different material behaviors.
Article
Engineering, Geological
Tomas Kadlicek, Tomas Janda, Michal Sejnoha, David Masin, Jan Najser, Stepan Benes
Summary: This paper introduces an automated deterministic method for calibrating the Modified Cam-Clay and hypoplastic clay model. The calibration is structured in a hierarchical order based on the apriori sensitivity study. The method focuses on the physical meaning of the model parameters rather than a complete optimization of the objective error function. It only requires basic laboratory experiments and is currently implemented in the free online application called ExCalibre.
Article
Engineering, Geological
J. Duque, M. Yang, W. Fuentes, D. Masin, M. Taiebat
Summary: The paper discusses seven characteristic limitations frequently observed in cyclic loading simulations of sands, including stress overshooting, one-way ratcheting in cyclic strain accumulation, and liquefaction strength curves. Four advanced constitutive models are analyzed for their specific limitations and capabilities in simulating essential aspects of cyclic loading of sands.
Article
Engineering, Geological
J. Duque, M. Tafili, G. Seidalinov, D. Masin, W. Fuentes
Summary: This article investigates the strengths and weaknesses of four advanced constitutive models for anisotropic fine-grained soils, namely: the anisotropic hypoplastic model, the SANICLAY-B elasto-plastic model, the constitutive Anamnesis model, and the three surface kinematic hardening model. The simulation results are compared qualitatively and quantitatively against experimental results on an anisotropic kaolin.
Article
Engineering, Geological
J. Duque, J. Rohac, D. Masin, J. Najser
Summary: This study presents the results of experimental investigation on Malaysian kaolin under monotonic and cyclic loading. It was found that the mechanical behavior of the kaolin is significantly influenced by the variation of initial conditions. The experimental results also suggest that the Miner's rule is not valid under undrained cyclic conditions. A modified method was proposed to estimate the accumulated pore water pressure and strains in undrained cyclic tests with different loading magnitudes.
Article
Engineering, Geological
J. Duque, J. Rohac, D. Masin
Summary: This article experimentally evaluates the influence of directional drained cyclic preloadings on the subsequent undrained monotonic and cyclic response of Zbraslav sand. The experiments considered several different preloading directions, magnitude of the maximum deviatoric stress reached during the drained preloading stage and deviatoric stress amplitudes during the undrained shearing stage. The results suggest that the direction of drained preloading history significantly affects the rate of strains and pore water pressure accumulation, as well as the contractive/dilative response during subsequent undrained monotonic loading.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Geological
M. Ochmanski, D. Masin, J. Duque
Summary: Despite progress in monopile analysis and design, many existing methods rely on complex mathematical structures and uncertain assumptions. This study proposes a simple yet efficient two-dimensional modeling approach for monopile analysis under drained and undrained lateral cyclic loading conditions. The approach accurately predicts pile displacements and bending moments, but fails to reproduce pore water pressures in low permeability materials.
SOILS AND FOUNDATIONS
(2023)
Editorial Material
Engineering, Geological
J. Duque, M. Yang, W. Fuentes, D. Masin, M. Taiebat
Article
Computer Science, Interdisciplinary Applications
M. Tafili, J. Duque, M. Ochmanski, D. Masin, T. Wichtmann
Summary: To accurately predict settlements and pore water pressure build-up in boundary value simulations, robust constitutive models capable of reproducing soil mechanical behavior under monotonic and cyclic loading are necessary. This study evaluated the prediction capabilities and limitations of two advanced constitutive models, CAM and AHP+ISA, using more complex and realistic cyclic triaxial tests. The influence of drained cyclic preloadings and packages of cycles with different deviatoric stress amplitudes in different sequences was examined.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
J. Duque, J. Rohac, D. Masin, J. Najser, J. Oprsal
Summary: This article presents a comprehensive experimental investigation on Zbraslav sand under monotonic and cyclic loading. The material response at large strains and compressibility were evaluated through undrained monotonic triaxial tests and oedometric compression tests with multiple unloading-reloading cycles. Undrained cyclic triaxial tests were also performed to analyze the effect of different preloadings on the cyclic resistance. The results showed that drained cyclic preloadings modified the pore water pressure accumulation rate and increased the cycles to failure, while undrained cyclic preloadings had both positive and negative effects on the subsequent undrained cyclic resistance.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Geological
J. Duque, M. Tafili, D. Masin
Summary: Soil deposits can undergo preloading episodes due to various factors, which significantly influence the subsequent mechanical behavior and liquefaction resistance. Advanced constitutive models are necessary to accurately describe the influence of cyclic preloadings on soil behavior. This study investigated the influence of cyclic preloadings on liquefaction resistance using three advanced models, and simulations were based on experimental data. Remarks on the capabilities and limitations of the models and their effects on boundary value simulations are provided.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Geological
David Masin, Jose Duque
Summary: This paper presents a study on the accuracy of 2D finite-element predictions of a displacement field for retaining structures supporting the excavation next to the Komorany tunnel in Prague, Czech Republic. Two different constitutive models were used, and the hypoplastic model showed more accuracy in predicting both laboratory and field measurement results. The paper also discusses the importance of selecting the correct constitutive model for predicting boundary value problems.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2023)
Article
Construction & Building Technology
Rodrigo Polo-Mendoza, Otto Mora, Jose Duque, Emilio Turbay, Gilberto Martinez-Arguelles, Luis Fuentes, Oswaldo Guerrero, Sergio Perez
Summary: The road infrastructure industry consumes a lot of economic resources and has significant environmental impacts. Finding new methods, materials, and technologies is essential for a more sustainable industry. Perpetual Pavements (PPs) are a promising alternative as they have a longer service life compared to Conventional Flexible Pavements (CFPs) and Conventional Rigid Pavements (CRPs). However, there is limited research on the sustainability performance of PPs, especially in developing countries. This study conducted a case study in Barranquilla city, Colombia, using Life Cycle Assessment (LCA) and Life Cycle Cost Analysis (LCCA) methodologies. The results showed that PPs have less environmental damage and higher cost-efficiency compared to CFPs and CRPs in underdeveloped nations.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Engineering, Geological
J. Duque, M. Loche, G. Scaringi
Summary: The shear-rate weakening or strengthening behaviors of landslides are influenced by the properties of the basal material and can control the speed and duration of the landslide. Understanding the stress-strain-time response of the basal material is crucial for assessing landslide dynamics and associated risks. In this study, the frictional resistance of different types of soil was tested under normal stresses representative of landslide shear zones. The results showed velocity strengthening behavior in fine-grained soils, while small shear-rate effects were observed in sand. Incorporating these observed behaviors into model formulations can improve the prediction of landslide outcomes.
GEOTECHNIQUE LETTERS
(2023)