Article
Computer Science, Interdisciplinary Applications
H. Moghaddasi, B. Shahbodagh, N. Khalili
Summary: A bounding surface plasticity model based on effective stress concept is proposed to describe the behavior of unsaturated structured soils under hydro-mechanical loadings. The model considers structural degradation effects on compressive and tensile strength, and uses void ratio-dependent water retention model and work hardening approach to account for the degradation process.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Chemistry, Physical
Junxiang Wang, Giovanna Xotta, Nico De Marchi, Valentina Salomoni
Summary: Results from cyclic triaxial experiments show that porous media, such as clays, exhibit different long-term behaviors under different cyclic stress ratios (CSRs). These behaviors can be classified into three main categories: cyclic shakedown, cyclic stable, and cyclic failure. However, modeling these soil deformation responses and other fundamental cyclic aspects is still a challenge with limited research. To address this, an enhanced plasticity model based on the bounding surface and stress distance concepts is developed, which accurately captures and reproduces key aspects of clays' cyclic behavior.
Article
Energy & Fuels
Agostino Walter Bruno, Matthew J. Johnson
Summary: This paper presents a water permeability function for deformable and unsaturated soils, considering various factors such as saturation degree, suction, particle size distribution, etc. The function is then coupled with a hydromechanical model and validated using experimental data. The proposed model is significant for studying coupled flow-deformation problems in geotechnical and geo-environmental engineering.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Geological
Seyed Iman Moghadam, Ehsan Taheri, Morteza Ahmadi, Seyed Ali Ghoreishian Amiri
Summary: This paper presents a constitutive model that can simulate the monotonic and cyclic behavior of clay and sand in a unified framework. The model effectively captures the elastic-plastic behavior of the soil using the bounding surface concept, a new dilatancy relation, and a kinematic hardening rule. An implicit integration scheme is introduced to improve the accuracy and convergence of the model. Experimental data from the literature are used to verify the accuracy and performance of the model.
Article
Engineering, Geological
Jianjun Ma, Junwei Guan, Yilin Gui, Linchong Huang
Summary: An anisotropic plasticity model has been developed to describe the nonisotropic mechanical behaviors of porous media, which has been validated through stress-strain responses modeling under various loading conditions. The model demonstrates good agreement with experimental results, showcasing its capability in capturing the complex behavior of porous media.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2021)
Article
Soil Science
Emmanuel Arthur, Hafeez Ur Rehman, Markus Tuller, Nastaran Pouladi, Trine Norgaard, Per Moldrup, Lis Wollesen de Jonge
Summary: This study proposes regression models that estimate the Atterberg limits and plasticity index based on hygroscopic water content at different relative humidity values. The results show that measuring water content at higher relative humidity levels provides more accurate estimates of the Atterberg limits. The models based on hygroscopic water content outperformed models based on clay content and organic carbon or CEC in estimating the Atterberg limits.
Article
Engineering, Multidisciplinary
Jacinto Ulloa, Nima Noii, Roberto Alessi, Fadi Aldakheel, Geert Degrande, Stijn Francois
Summary: This paper presents a novel variational phase-field model to describe fracture processes in saturated porous media. The model utilizes a micromechanics-based theory to connect field variables with physical mechanisms at the microcrack level, where damage and plasticity arise from microcrack growth and frictional sliding. The model also considers hydromechanical coupling effects and incorporates a non-associative frictional plasticity law.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Mechanics
Yannis F. Dafalias, Alexandros L. Petalas, Heidi Feigenbaum
Summary: The Bounding Surface (BS) plasticity model for metals is modified by introducing the BCD modification, based on the proposition of Burlet and Cailletaud (1986) and Delobelle (1993). The BCD modification is applied to the relative kinematic hardening between Yield Surface (YS) and BS, maintaining the decoupling feature of BS and allowing flexibility without altering the plastic modulus. The introduced BCD modification for the BS is significantly modified itself by introducing a varying modification parameter.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Engineering, Geological
Yang Yu, Zhongxuan Yang
Summary: Soil is inherently anisotropic due to sedimentation and generally experiences anisotropic stress in the field. Most existing models do not consider the inherent anisotropy of clays under isotropic stress, and lack consideration of the interplay between fabric and loading direction. In this study, an anisotropic bounding surface model is formulated to address these issues and simulate the behavior of overconsolidated clay under different consolidation histories.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2023)
Article
Computer Science, Interdisciplinary Applications
An Zhang, Mingjing Jiang, Dong Wang, Qingping Li
Summary: This study proposes a new constitutive model to simulate the mechanical behavior of methane hydrate-bearing sediments and successfully captures the stiffness, strength, and dilatancy enhancements induced by methane hydrates. The model can also account for the temperature, pore pressure, and salinity-dependent behavior of sediments. Furthermore, the model is verified through comparisons with experimental data and discrete element method simulations.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
Bestun J. J. Shwan
Summary: This paper presented modifications to and the development of a computational limit analysis method (UNSAT-DLO), which considered the influence of hydraulic hysteresis, mechanical behavior, and changes in soil fabric on strength. The comparison with experimental results demonstrated that the UNSAT-DLO approach could capture the nonlinearity of the experimental results within a small range of suction profiles. In addition, differences in the failure mechanisms due to the hysteresis were investigated to provide insights into distinct changes in the failure modes due to the hydraulic hysteresis and mechanical behaviors.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2023)
Article
Engineering, Mechanical
Atri Nath, Sudhirkumar Barai, Kalyan Kumar Ray
Summary: This study examines a methodology that combines Chaboche's CIKH model and genetic algorithm optimization technique to simulate the cyclic-plastic response of materials exhibiting cyclic hardening or softening behavior. The results demonstrate the accuracy of this approach in predicting the experimental results for various materials and its comparability with existing predictions, validating its applicability.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Engineering, Civil
Beshoy Riad, Xiong Zhang
Summary: This paper introduces a consistent three-dimensional elasto-plastic model to study unsaturated soil behavior with consideration of coupled hydro-mechanical hysteresis. The model provides consistent predictions for different soil phases, addressing a significant limitation in many existing models. The ability to represent hydro-mechanical coupling during shearing and changes in saturation level is a distinctive feature of the model.
TRANSPORTATION RESEARCH RECORD
(2021)
Article
Chemistry, Physical
Eunsang Lee, Florian Mueller-Plathe
Summary: The Cassie-Baxter state of wetting can explain the behavior of water droplets on superhydrophobic rough surfaces, including the equilibrium contact angle and the slippery dynamics. This study provides a deeper understanding of the contact line dynamics on rough surfaces using the molecular kinetic theory. The findings demonstrate the importance of additional friction forces and shed light on the origin of contact angle hysteresis.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Hongzhi Cui, Jian Ji, Jian Song, Wengui Huang
Summary: This study presents a series of improved stability charts based on limit equilibrium pseudo-static analysis of a wide range of homogeneous slope models. The developed charts provide solutions for estimating the factor of safety with good performance.
COMPUTERS AND GEOTECHNICS
(2022)