Article
Engineering, Geological
Ming Yang, Mahdi Taiebat, Yannis F. Dafalias
Summary: The new constitutive model for sand incorporates two new ingredients for controlling plastic strains and pore pressure development, as well as simulating large shear strain development in the post-liquefaction stage. With a single set of constants, this model successfully simulates undrained cyclic tests with different stress ratios, contributing to potential applications in seismic site response analysis.
Article
Engineering, Geological
William Fuentes, David Masin, Jose Duque
Summary: A constitutive model for anisotropic clays was proposed and evaluated under monotonic and cyclic loading in this study. The model was extended through the ISA approach, enhancing its performance on cyclic loading.
Article
Engineering, Geological
Linh A. Le, Giang D. Nguyen, Ha H. Bui, Jose E. Andrade
Summary: This paper proposes a theoretical framework that provides links between mechanical responses inside and outside the localisation band, allowing for the quantification of behavior inside the localisation band. The correlation between the thickness of the localisation band and its behavior is shown, bounded by a unique stress-deformation relationship describing the behavior of an idealized zero-thickness localisation band.
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
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
Engineering, Geological
Naman Kantesaria, Ajanta Sachan
Summary: This experimental study investigates the elastic and yielding response of compacted high-plasticity clay and its deformation characteristics at larger strains for different stress paths and stress states. The study finds that the stress path direction has a significant impact on the stress-strain-strength properties of the soil, with the peak deviatoric stress increasing with the increase in stress path angle. The small-strain shear modulus is observed to decrease with increasing strain level during shearing. The study also attempts to establish the yielding criteria for compacted cohesive soil based on the elastic shear stiffness in pre-yield 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
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
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
Computer Science, Interdisciplinary Applications
Hang Zhou, Hanlong Liu, Zengliang Wang, Xuanming Ding
Summary: This paper presents a unified and rigorous solution for the quasi-static cylindrical cavity expansion problem in all existing plasticity constitutive models. Through numerical and analytical methods, the proposed solution provides a general approach that can be applied to various plasticity constitutive models.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Computer Science, Interdisciplinary Applications
J. A. M. Teunissen
Summary: This paper presents a general 3D model that includes the intermediate stress in strength analysis. The model allows for a smooth transition between different expressions of strength and considers the effect of intermediate stress on strength. An equivalent Mohr-Coulomb approach is developed for failure load calculation in plane strain configurations, and the match between the general 3D model and the equivalent Mohr-Coulomb formulation is demonstrated with Finite Element Method examples. The dominant mechanism in simulating failure loads in non-associative case is shown to be strain localization, and the Davis expressions derived from the equivalent Mohr-Coulomb model match the simulations of the general 3D model.
COMPUTERS AND GEOTECHNICS
(2022)
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
Charles W. W. Ng, Xudong Zhao, Shuai Zhang, Junjun Ni, Chao Zhou
Summary: The study investigated the thermo-hydro-mechanical interactions of a two-by-two floating energy pile group and pile raft under asymmetrical thermal cycles, using an advanced thermo-mechanical bounding surface model. It was found that the irreversible volumetric contraction of soil near the energy piles decreased horizontal stress and shaft resistance, while the non-energy pile area experienced less thermal effects, leading to smaller soil contraction and settlement.
Article
Engineering, Mechanical
Bin Li, Yi Cui, Shuo Liu, Rining Huang, Yan Fu, Zhanming Ding
Summary: A coupled plasticity-damage model is developed for predicting the burst speed and failure displacement of turbine materials under different stress states and operating temperatures. Experimental validation demonstrates that the proposed model performs better than traditional constitutive models in terms of prediction accuracy.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Geological
William Fuentes, David Masin, Jose Duque
Summary: A constitutive model for anisotropic clays was proposed and evaluated under monotonic and cyclic loading in this study. The model was extended through the ISA approach, enhancing its performance on cyclic loading.
Article
Engineering, Marine
Huan Wang, Lizhong Wang, Yi Hong, Davis Masin, Wei Li, Ben He, Hualin Pan
Summary: This study presents unique centrifuge testing results on the lateral behavior of heavily instrumented large-diameter slender piles in medium dense sand. The lateral behaviors of large-diameter slender piles are marginally different from those of small-diameter slender piles, but significantly deviate from the large-diameter stubby piles. The longstanding argument of 'diameter effect' may have minor significance, with the lateral behavior of monopile in sand being more significantly governed by the relative pile-soil stiffness.
Article
Engineering, Geological
Tomas Mohyla, Jan Bohac, David Masin
Summary: Experimental data on small strain stiffness of unsaturated soils is essential for developing and calibrating advanced numerical models. The study found that both net stress and suction lead to increased stiffness in the soil. The experimental data were used to calibrate constitutive parameters and assess the capabilities of an advanced hypoplastic model for unsaturated soils, with good agreement between model predictions and laboratory measurements.
Article
Computer Science, Interdisciplinary Applications
Jan Jerman, David Masin
Summary: The newly proposed hypoplastic model was evaluated through modelling the geotechnical failure of a deep excavation of Nicoll Highway in Singapore in 2004. The model demonstrated good comparisons with experimental data and improvements over the original hypoplastic model. Numerical simulations of the excavation collapse showed a good fit with inclinometer data up to the final stages, indicating the significance and effectiveness of the model in predicting such failures.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Geological
Djamel Eddine Bouri, Abdelkader Brahimi, Abdallah Krim, Ahmed Arab, Jan Najser, David Masin
Summary: This study examines the compressibility behavior of Chlef sand, specifically looking at the impact of fines content, relative density, and initial conditions. The results show that higher fines content leads to increased compressibility coefficients, while higher density decreases these coefficients. Additionally, the method of sample preparation can also affect the compressibility performance.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2022)
Article
Computer Science, Interdisciplinary Applications
Jan Jerman, David Masin, Raffaele Ragni, Britta Bienen, Miroslav Spaniel
Summary: An advanced hypoplastic constitutive model for soft clay was developed and explored through simulation of spudcan foundation penetration into clay. Strength anisotropy, stress- and OCR-dependency of undrained shear strength, and structure degradation were shown to be important aspects to consider in geotechnical problems.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Geological
Haiquan Sun, Gianvito Scaringi, David Masin, Jan Najser
Summary: The study investigated the swelling behavior of B75 bentonite under different conditions such as initial dry density, vertical load, and pore fluid salinity. Through one-dimensional swelling tests and conventional oedometer tests, a unique relationship was found between effective stress and dry density at saturation. The empirical corrected double layer model successfully predicted swelling pressure during the tests.
ENGINEERING GEOLOGY
(2022)
Article
Engineering, Geological
Tomas Kadlicek, Tomas Janda, Michal Sejnoha, David Masin, Jan Najser, Stepan Benes
Summary: This paper discusses an automated deterministic approach to calibrate the parameters of a hypoplastic model for sand. The calibration is based on results from basic laboratory experiments and is implemented in a hierarchical order. The calibration procedure considers the physical meaning of the parameters and their influence on material properties.
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, 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
Engineering, Geological
M. Ochmanski, D. Masin, J. Duque, H. Yi, W. Lizhong
Summary: The deformations induced by cyclic lateral loading on tripod buckets embedded in sand reveal recovery of dynamic stiffness with the number of cycles and subsequent increase in settlement rate, caused by uneven soil fabric and density changes among the buckets. Predicting this effect accurately is a challenge, and back-analysis of centrifuge tests with a three-dimensional finite-element model can provide insights into the phenomenon.
GEOTECHNIQUE LETTERS
(2021)
