Article
Engineering, Geological
Xiao Yin, Yuanming Lai, Enlong Liu
Summary: Based on current knowledge, this paper proposes a method to determine the effective stress of unsaturated frozen soils by considering the soil microstructures. The degrees of saturation at both micro- and macroscopic scales are used to separate water in different pores. The derived effective stress accounts for the morphology and mechanical properties of ice and can be simplified under various assumptions. The paper also derives the elastic bulk modulus of the solid matrix and investigates the dissipation inequality during inelastic deformation. This theoretical work provides important insights into the mechanical constitutive study of unsaturated and saturated frozen soils in cold regions engineering.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2023)
Article
Engineering, Geological
G. M. Rotisciani, A. Desideri, A. Amorosi
Summary: The paper introduces a new single-surface elasto-plastic model for unsaturated cemented soils, focusing on the mechanical instabilities induced by plastic strain accumulation and changes in pore saturation. The constitutive equations are used to simulate geotechnical testing conditions and analyze results, proposing a stability criterion for failure conditions. The crucial role of state variables and model parameters on potential failure conditions is highlighted and validated against numerical results.
Article
Computer Science, Interdisciplinary Applications
Hassan Sabetamal, Daichao Sheng, John P. Carter
Summary: This paper presents a coupled hydro-mechanical modelling approach for unsaturated soil problems using advanced numerical and constitutive models in Abaqus. Two different strategies for interpreting unsaturated soil behaviour are considered, with relevant constitutive models implemented through user-defined subroutines. The algorithms are validated through benchmark problems and applied to simulate challenging unsaturated geomechanics problems, demonstrating the utility of the implemented procedures. Mesh optimization is also incorporated to handle finite deformations.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Mathematics, Interdisciplinary Applications
Javad Ghorbani, David W. Airey
Summary: This paper presents a constitutive model for multiphase granular soils that captures features such as wetting and drying processes, anisotropy, and changing compressibility by combining isotropic and kinematic hardening. The model ensures smooth transitions between saturated and unsaturated states and is implemented numerically with smoothing techniques for enhanced performance. The computational framework also includes error control and sub-stepping techniques for additional control over accuracy and speed.
COMPUTATIONAL MECHANICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Wen-hua Liu, Wu-gang Li, Hong-yong Zhang, Xin-yi Lin, Gang-qiang Kong, Long Wang, Pan Hu
Summary: This paper presents an advanced approach for interpreting the hydro-mechanical response of unsaturated structured soil, taking into account the degradation of bond strength and the role of saturation in unsaturated conditions. The proposed model incorporates a structure degradation law to account for the breakage of inter-particle bonding during loading, and a volume change equation is proposed to better explain the compressibility of structured soils under saturated and unsaturated conditions.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Computer Science, Interdisciplinary Applications
T. Ligursky, Z. Michalec
Summary: This paper investigates the thermodynamic consistency of the Barcelona Basic Model and its coupling with a hydraulic model. A framework for poroelastoplasticity using net stress and suction as stress variables is developed and applied to derive a consistent hydro-mechanical coupling for the Barcelona Basic Model. The resulting restrictions on hydraulic behavior are found to be too strict and not completely physically acceptable. It is concluded that caution should be exercised in developing and utilizing poromechanical models using net stress and suction as stress variables with respect to their thermodynamic consistency, and different types of models should be employed for coupled hydro-mechanical modeling.
COMPUTERS & STRUCTURES
(2023)
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
Soil Science
Oluwaseun Temitope Faloye, Ayodele Ebenezer Ajayi, Alexander Zink, Heiner Fleige, Jose Dorner, Rainer Horn
Summary: The study found that effective stress and changes in pore water pressure are largely affected by the prevailing matric potential in the soil. Additionally, changes in soil structure caused by tillage, organic carbon, and clay content influence the magnitude of effective stress and pore water pressure during loading. The porewater pressure measured under static loading is sampling direction dependent due to differences in hydraulic conductivity and pore continuity.
SOIL & TILLAGE RESEARCH
(2021)
Article
Energy & Fuels
Joao R. Maranha, Carlos Pereira, Rafaela Cardoso
Summary: This paper analyzes the capillary stresses and water retention of spherical particles to understand the effective stress in unsaturated soils. The study reveals that the relationship between capillary stress and water retention in sphere arrangements is more complex than previously assumed, impacting unsaturated soil mechanics and its effective stress. The research also highlights the role of sphere roughness in the disappearance of capillary stresses in sand and the non-monotonic evolution of capillary stress with suction.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(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
Computer Science, Interdisciplinary Applications
K. Krabbenhoft, J. Krabbenhoft
Summary: A simplified kinematic hardening plasticity framework for constitutive modeling of soils is proposed, where yield surfaces are used to compute effective hardening modulus for efficient numerical implementation. The framework is detailed for total and effective stress analysis, and illustrated with a simple model for undrained total stress analysis of clays.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Mathematics, Interdisciplinary Applications
Javad Ghorbani, Jayanta Kodikara
Summary: This paper outlines an extension of Biot's theory of dynamic wave propagation in fluid-saturated media, which can be used to model dynamic soil-structure interaction in frictionless conditions across different soil saturation levels. The analysis highlights the limitations of using saturation as Bishop's parameter in accurately modeling unsaturated soil behavior, especially as the soil becomes dry. A new definition of effective stress is proposed based on the analysis, along with recommendations for constitutive modeling. Additionally, a fully coupled finite element contact model is introduced, demonstrating its capability to control the vanishing capillary effect on soil-structure interaction as the soil dries.
COMPUTATIONAL MECHANICS
(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
Angelica Tuttolomondo, Alessio Ferrari, Lyesse Laloui
Summary: This paper proposes an effective stress-based approach for addressing geotechnical problems with rapidly occurring total stress changes in relation to soil consolidation time. Analytical formulations for pore-pressure coefficients are available for saturated states that adopt coherent effective stress concepts. However, there are currently no analytical formulations for unsaturated states. This paper presents analytical derivations of pore-pressure coefficients for unsaturated elastic isotropic soils using the generalized effective stress for different total stress changes. The proposed approach requires fewer constitutive parameters and allows for the determination of saturated state expressions and retention curve under undrained conditions. Experimental data were analyzed, and the proposed framework demonstrated satisfactory interpretations and predictions of the results. This research is valuable for undrained mechanical analyses of unsaturated soils in various practical applications.
CANADIAN GEOTECHNICAL JOURNAL
(2023)
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
Xinyu Ye, Qiong Wang, Shanyong Wang, Scott Sloan, Daichao Sheng
Editorial Material
Computer Science, Interdisciplinary Applications
Alexander M. Lester, Scott W. Sloan
COMPUTERS AND GEOTECHNICS
(2019)
Article
Engineering, Geological
Ayman A. Abed, Wojciech T. Solowski
ENVIRONMENTAL GEOTECHNICS
(2020)
Article
Engineering, Multidisciplinary
Quoc Anh Tran, Wojciech Solowski, Martin Berzins, James Guilkey
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2020)
Article
Engineering, Geological
Ayman A. Abed, Wojciech T. Solowski
Summary: A water retention model based on soil mineralogy and microscopic features of material behavior is developed in this paper, with simple formulae proposed to estimate water content and interparticle void ratio. The model's validation using published data for bentonites shows promising results, indicating its potential applicability to other geomaterials. The insights provided into the links between microstructure and macroscopic behavior offer a valuable tool for indirect estimation of water retention behavior in porous materials with known mineral composition and microstructural data.
Article
Computer Science, Interdisciplinary Applications
Ayman A. Abed, Wojciech T. Solowski
COMPUTERS AND GEOTECHNICS
(2020)
Article
Engineering, Chemical
J. Krzyzanowski, J. Tejchman, W. Solowski, M. Wojcik
Summary: This paper focuses on the confined flow of cohesionless sand in a silo using the material point method (MPM). Different initial void ratios and wall roughness were considered in the simulations, with emphasis on the evolution of shear zones and their impact on wall stresses during flow. The numerical findings enhance the understanding of shear localization in granular materials and its effects on wall pressures in confined silo flow.
Article
Computer Science, Interdisciplinary Applications
Seyedmohammadjavad Seyedan, Wojciech T. Solowski
Summary: This paper introduces a Granular algorithm enhancing Material Point Method (MPM) for simulation of granular flows in different states, which is more realistic and reduces grid dependency in disconnected flow state modeling. The Granular MPM is evaluated and compared with other available MPM formulations, showing more accurate replication of steady state flows.
COMPUTERS & STRUCTURES
(2021)
Article
Engineering, Geological
Giulia Scelsi, Ayman A. Abed, Gabriele Della Vecchia, Guido Musso, Wojciech T. Solowski
Summary: This paper presents a simple elasto-plastic model capable of reproducing the behaviour of unsaturated clayey soils in saline environments by considering osmotic suction as a variable. The model, implemented in Thebes code and calibrated for Boom Clay, shows promising agreement between experimental results and simulations, addressing the important features of partially saturated soils with saline pore fluid.
ENGINEERING GEOLOGY
(2021)
Article
Mechanics
Tito Adibaskoro, Wojciech Solowski, Simo Hostikka
Summary: This paper demonstrates the implementation of a multi-surface elasto-plastic constitutive material model for wood through numerical simulations, successfully replicating experimental outcomes. The simulations show that wood exhibits different failure patterns under varying conditions, but overall displays similar failure loads and behavioral characteristics.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Multidisciplinary Sciences
Tito Adibaskoro, Wojciech Solowski, Simo Hostikka
Summary: This article presents load and displacement data of Norway Spruce quasi-static compression test as well as video recordings of the experiment. The study provides valuable information for validation of wood material models or simulation methods with wood material implementations.
Article
Engineering, Geological
Zhong-Sen Li, Leena Korkiala-Tanttu, Wojciech Solowski
Summary: This paper applies the Structure from Motion photogrammetry technique to measure the three-dimensional shrinkage deformations of a cylindrical specimen during drying. A new photogrammetric system is used to observe the shrinkage behavior of a clay-binder mixture for four weeks. The reconstructed dense point cloud data is used to compute the volume change and shrinkage deformations, with satisfactory accuracy achieved.
Article
Energy & Fuels
X. Pintado, S. Kumpulainen, E. Romero, A. Lloret, R. C. Weber, A. Ferrari, M. V. Villar, A. Abed, W. Solowski, V. Heino
Summary: This study measured the failure deviatoric stress and shear modulus of compacted Wyoming-type bentonite through various shearing tests, and investigated the influence of different dry densities, degrees of saturation, and confining pressures on its shear properties. The results showed good agreement with the measured values.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2023)
Article
Energy & Fuels
Wojciech T. Solowski, Seyedmohammadjavad Seyedan
Summary: The paper presents an improved Granular Material Point Method for unsaturated granular materials. It discusses the key processes occurring during unsaturated flows and proposes an algorithm for the method. Simulation results show that the proposed formulation leads to improved and different outcomes, highlighting the importance of considering partial saturation in material flow analysis. The paper also provides visual illustrations of the simulations through figures and videos.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2023)
Proceedings Paper
Engineering, Environmental
Ayman Abed, Wojciech Solowski
4TH EUROPEAN CONFERENCE ON UNSATURATED SOILS (E-UNSAT 2020)
(2020)