International Journal for Numerical and Analytical Methods in Geomechanics最新文献_第4页

An Anisotropic Constitutive Model for Crushable Geomaterials Based on Non-Stationary Critical State Line Concept 基于非平稳临界状态线概念的可破碎岩土材料各向异性本构模型

IF 3.6 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-10-07 Epub Date: 2026-08-26 DOI: 10.1002/nag.70424

Hesam Dejaloud, Hamed Taghavizade, Mohammad Rezania

{"title":"An Anisotropic Constitutive Model for Crushable Geomaterials Based on Non-Stationary Critical State Line Concept","authors":"Hesam Dejaloud, Hamed Taghavizade, Mohammad Rezania","doi":"10.1002/nag.70424","DOIUrl":"10.1002/nag.70424","url":null,"abstract":"<p>In this paper, the dependencies of granular soil behaviour on particle crushing and fabric anisotropy are formulated within a novel model based on bounding surface plasticity theory enriched by the non-stationary critical state line (NCSL) concept. By introducing a flexible decay function, the variation in the position and slope of the CSL with the magnitude of particle crushing is regulated. The originality of the model extends beyond its ability to capture the pre- and post-failure behaviour of crushable geomaterials, as the elastic moduli are also modified to depend on both the stress state and the extent of particle breakage. The capabilities of the model are demonstrated against published data from triaxial compression tests on the widely studied Cambria sand and a compacted coal wash reject material from Australia. It is shown that the proposed model consistently captures the behaviour of crushable geomaterials across a wide range of void ratios, stress levels and particle breakage states, using a unified set of parameter values. The formulation of this anisotropic model has been kept sufficiently simple to facilitate its straightforward future implementation into a continuum-based numerical framework for boundary value problem simulations.</p>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"50 16","pages":"5919-5935"},"PeriodicalIF":3.6,"publicationDate":"2026-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/nag.70424","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148836259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Three‐Dimensional Spatiotemporal Evolution Model for Two‐Phase Grouting Flow in Water‐Bearing Porous Media Based on the Forchheimer‐Modified Brinkman Equation 基于Forchheimer修正Brinkman方程的含水多孔介质中两相注浆流动三维时空演化模型

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-10-06 DOI: 10.1002/nag.70450

Jiasen Liang, Xueming Du, Lei Wang, Hongyuan Fang, Xiaohua Zhao, Bin Li, Peng Zhao, Shanyong Wang

{"title":"A Three‐Dimensional Spatiotemporal Evolution Model for Two‐Phase Grouting Flow in Water‐Bearing Porous Media Based on the Forchheimer‐Modified Brinkman Equation","authors":"Jiasen Liang, Xueming Du, Lei Wang, Hongyuan Fang, Xiaohua Zhao, Bin Li, Peng Zhao, Shanyong Wang","doi":"10.1002/nag.70450","DOIUrl":"https://doi.org/10.1002/nag.70450","url":null,"abstract":"Water‐bearing gravelly sand layers pose significant risks to underground construction due to their loose structure, high permeability, and susceptibility to seepage‐induced failure. To better understand and control grout migration in such formations, a three‐dimensional spatiotemporal model for grouting diffusion in water‐bearing porous media was developed using the Forchheimer‐modified Brinkman equation, with the level‐set method employed to capture the dynamic slurry‐water interface. The model incorporates viscous diffusion (Brinkman term) and inertial resistance (Forchheimer term), allowing characterization of both low‐Reynolds‐number shear‐dominated flow and nonlinear inertial effects at higher Reynolds numbers. The coupled framework simultaneously resolves the flow field, pressure field, and interface migration. Numerical simulations were compared with transparent‐chamber dynamic water grouting experiments and showed reasonable agreement in slurry diffusion morphology, pressure evolution, and asymmetric propagation in the with‐flow and against‐flow directions. Results show that the hydraulic gradient strongly controls slurry diffusion under flowing‐water conditions. The diffusion front advances farther downstream, while upstream propagation is restricted by hydraulic back pressure. The pressure field evolves from an initial transient state to a quasi‐steady regime, with pressure accumulation near the injection point and asymmetric attenuation along the flow direction. Slurry velocity decreases progressively with time, and high‐viscosity zones expand and shift downstream. The proposed model provides a useful numerical tool and theoretical basis for optimizing grouting design and predicting slurry diffusion in complex hydrogeological environments.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"31 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149087451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical Implementation of the Transformed Stress Method for 3D Generalization of Soil Constitutive Models 土本构模型三维概化的转换应力法数值实现

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-10-06 DOI: 10.1002/nag.70453

Yu Tian, Neimeng Zheng, Yangping Yao, Dechun Lu, Xiuli Du

{"title":"Numerical Implementation of the Transformed Stress Method for 3D Generalization of Soil Constitutive Models","authors":"Yu Tian, Neimeng Zheng, Yangping Yao, Dechun Lu, Xiuli Du","doi":"10.1002/nag.70453","DOIUrl":"https://doi.org/10.1002/nag.70453","url":null,"abstract":"Conducting three‐dimensional (3D) numerical simulation is of great importance for accurately analyzing the stress and deformation of complex geotechnical structures. The transformed stress (TS) method provides an ingenious theory for the 3D generalization of soil constitutive models, but studies on its numerical implementation are limited. This paper first illustrates the basic idea of the TS method by showing how to obtain a 3D yield surface from the triaxial compression yield locus. According to the evolution trend of the Matsuoka‐Nakai yield locus on the deviatoric plane, a revised expression is proposed to determine the TS tensor when tensile stress appears. As an example, the Modified Cam‐clay model is generalized to be 3D, and its stress integration is implemented using the closest point projection method. Partial derivatives of the TS are efficiently calculated by the implicit differentiation method, while various singularity problems in special cases are overcome. Single‐element testing under different loading conditions and tunnel excavation simulation demonstrate that the proposed stress integration algorithm has high accuracy and strong convergence. Based on this work, the potential capability of the TS method in geotechnical structure analysis is displayed.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"1 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149087450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Coupled Control of Fines Content and Morphology on the Critical State and Fabric Evolution of Binary Granular Mixtures 细粒含量和形貌对二元颗粒混合物临界状态和织构演化的耦合控制

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-10-05 DOI: 10.1002/nag.70447

Tao Zhang, Ahmad Eraj Nikzad, Zhaohua Sun, Changjiang Wu, Chi Zhang

{"title":"Coupled Control of Fines Content and Morphology on the Critical State and Fabric Evolution of Binary Granular Mixtures","authors":"Tao Zhang, Ahmad Eraj Nikzad, Zhaohua Sun, Changjiang Wu, Chi Zhang","doi":"10.1002/nag.70447","DOIUrl":"https://doi.org/10.1002/nag.70447","url":null,"abstract":"This study investigates the coupled control of fines content ( f c ) and fine particle morphology ( P ) on the macro‐micro shear behavior of binary granular mixtures using coupled DEM‐FDM simulations. A series of drained triaxial compression tests were performed on mixtures with varying f c and different P . The results reveal a pronounced non‐monotonic dependence of shear behavior on f c . Both the peak friction angle and maximum dilation angle increase initially and reach their maxima at intermediate f c before decreasing as the coarse‑particle skeleton is progressively disrupted. In contrast, the critical state friction angle is primarily governed by P and exhibits a clear correlation with overall particle regularity O R . Divergent critical state lines observed in the conventional e ‐ p ′ space collapse into a single line when expressed using a modified equivalent skeleton void ratio that incorporates O R . Microscopic analysis shows that shear strength evolution is controlled by a structural transition in the contact network, from a coarse‑dominated skeleton at low f c to a fines‑dominated contact network at high f c . The anisotropy of normal contact forces is identified as the dominant contributor to macroscopic strength. These findings provide new insights into the coupled influence of fines content and fine particle morphology on the mechanical behavior of binary granular soils.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"476 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149087453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Stress‐Induced Anisotropy on the Stability of Infinite Sandy Slopes 应力诱导各向异性对无限砂质边坡稳定性的影响

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-09-28 DOI: 10.1002/nag.70448

Revathy Manohar, Devi Priyanka Darisi, Sireesh Saride, Gopal Santana Phani Madabhushi

{"title":"Effect of Stress‐Induced Anisotropy on the Stability of Infinite Sandy Slopes","authors":"Revathy Manohar, Devi Priyanka Darisi, Sireesh Saride, Gopal Santana Phani Madabhushi","doi":"10.1002/nag.70448","DOIUrl":"https://doi.org/10.1002/nag.70448","url":null,"abstract":"Reliable assessment of infinite sandy slope stability requires accounting for anisotropic in‐situ stress state imposed by slope geometry and self‐weight. This study presents a mechanics and state‐based analytical framework that introduces stress‐induced anisotropy through the effective principal stress ratio and quantifies its influence on shear resistance and factor of safety using standard soil parameters. Upper and lower bounds of are derived to determine the admissible slope stress‐state domain. The formulation links to slope geometry and provides a closed‐form evaluation without requiring complex anisotropic laboratory testing for routine applications. Parametric analyses were performed to assess the effect of anisotropy on soil and slope parameters. Stress‐path triaxial tests were conducted to examine consistency with the analytical trends. Clean river sand at different relative densities and a residual sandy soil from the 2024 Wayanad landslide site were tested under isotropic and anisotropic consolidation. Compared with isotropic consolidation, anisotropic consolidation produced 30%–40% reduction in peak deviatoric stress, greater contractive volumetric response, and earlier strain localization. Complementary undrained tests showed rapid pore‐pressure generation and contractive effective stress paths consistent with intense rainfall conditions. The framework is applied to published case studies as well as to the 2024 Wayanad landslide. Incorporating stress‐state anisotropy reduces the computed stability margins and can shift marginal slopes across commonly adopted screening thresholds. Generalized design charts relating , , and are developed to support screening‐level assessment and interpretation of proximity to commonly adopted stability thresholds for infinite sandy slopes.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"6 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149086136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydro‐Mechanical Modelling of Gas Migration in Bentonite: Formulation and Laboratory‐Scale Validation 膨润土中气体迁移的水力力学模型：配方和实验室规模验证

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-09-26 DOI: 10.1002/nag.70449

Desmond Talamwin Sunkpal, Mamadou Fall

{"title":"Hydro‐Mechanical Modelling of Gas Migration in Bentonite: Formulation and Laboratory‐Scale Validation","authors":"Desmond Talamwin Sunkpal, Mamadou Fall","doi":"10.1002/nag.70449","DOIUrl":"https://doi.org/10.1002/nag.70449","url":null,"abstract":"Gas generation and migration in bentonite buffer materials are critical processes affecting the performance of deep geological repositories for radioactive waste. This study presents a new hydro‐mechanical formulation for simulating gas migration in saturated, compacted bentonite, with particular emphasis on the role of non‐uniform stress fields at the laboratory scale. The objective is to establish and evaluate a mechanistically consistent numerical framework capable of reproducing key gas migration features observed in controlled experiments. The proposed formulation incorporates a stress‐dependent intrinsic permeability law in which permeability evolution is governed by the differential pressure between gas pressure and the minimum principal stress. This approach provides a continuous representation of the transition from background two‐phase flow to stress‐activated, dilatancy‐controlled gas migration. To account for heterogeneity associated with spatial variations in dry density, a random distribution of elastic properties is incorporated into the model. Gas transport is represented using a dual‐continuum framework in which preferential pathways emerge implicitly through constitutive coupling, without prescribing discrete fractures or explicit pathway geometries. The model is implemented and validated against gas injection tests on Mx80 bentonite conducted under constant‐volume. Simulated gas fluxes, pore pressures, and stress responses show good agreement with experimental observations. The results demonstrate that incorporating non‐uniform stress fields is essential for reproducing localized dilatancy and non‐uniform gas flow at the laboratory scale. The proposed framework provides a robust basis for modelling stress‐controlled gas migration in bentonite and forms a foundation for future upscaling to larger‐scale experiments and repository conditions.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"23 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149048871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Particle‐Scale Mechanics of a Regolith‐Type Soil 一种风化层型土壤的颗粒尺度力学

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-09-23 DOI: 10.1002/nag.70435

Vincenzo Nardelli, Chencheng Wang, Matthew Richard Coop

{"title":"Particle‐Scale Mechanics of a Regolith‐Type Soil","authors":"Vincenzo Nardelli, Chencheng Wang, Matthew Richard Coop","doi":"10.1002/nag.70435","DOIUrl":"https://doi.org/10.1002/nag.70435","url":null,"abstract":"The existing studies have reported that the surface of Mars shows the presence of materials having igneous origin, including basalt and regolith‐type coarse soils. These findings are affected by significant uncertainties and, therefore, the selection of simulants for various exploration applications, including surface mobility of rovers, should take into account the potential complications that might arise if unexpected materials are found. The present study focusses on the micromechanical characterisation of a regolith‐type soil (Eglin sand), comparing the results obtained with those determined for a quartz sand (Leighton Buzzard sand), that is also used as a Mars‐soil simulant. Eglin sand is constituted by a complex composition and the various minerals identified were tested and analysed separately. The testing activities included the characterisation of the particle shape and surface morphology, and the determination of particle strength, contact response, contact stiffness and inter‐particle friction. Differences in terms of particle morphology and surface properties were recorded for the two sands studied, and, along with grain mineralogy, these have been found to have an impact on the mechanical response, affecting both particle strength and inter‐particle behaviour. This study aims to provide realistic soil data and information to be used in numerical simulations performed using the Discrete Element Method, which is often adopted for the analysis of surface mobility problems.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"36 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149019979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Analytical Model for Long‐Term Settlement of Pile‐Soil Systems Considering Fractional‐Order Viscoelasticity and Soil Damage 考虑分数阶粘弹性和土壤损伤的桩土系统长期沉降分析模型

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-09-22 DOI: 10.1002/nag.70441

Yongtao Wang, Baozhen Han, Xiangtian Xu, Qiang Sun, Jiwei Wang, Yuhang Liu, Wenbin Huang

{"title":"An Analytical Model for Long‐Term Settlement of Pile‐Soil Systems Considering Fractional‐Order Viscoelasticity and Soil Damage","authors":"Yongtao Wang, Baozhen Han, Xiangtian Xu, Qiang Sun, Jiwei Wang, Yuhang Liu, Wenbin Huang","doi":"10.1002/nag.70441","DOIUrl":"https://doi.org/10.1002/nag.70441","url":null,"abstract":"Accurate prediction of the long‐term settlement of pile foundations remains challenging because the viscoelastic characteristics and damage behavior of foundation soils are not adequately considered in conventional settlement models. To address this issue, a fractional‐order viscoelastic damage creep model is developed by incorporating nonlinear damage variables into the fractional‐order Merchant model. Based on fractional calculus and the elastic‐viscoelastic correspondence principle, the Mindlin displacement solution is derived for a viscoelastic damaged foundation subjected to vertical loading. The pile settlement is decomposed into pile‐soil coordinated deformation and axial compression of the pile shaft, and a settlement calculation model for the pile‐soil system is established using the superposition principle. A self‐developed testing device is employed to characterize the pile–soil interface mechanical behavior and validate the proposed model. The results show that the damage factor significantly affects both the initial settlement rate and final settlement, whereas the fractional order governs the time‐dependent evolution of settlement. The calculated results agree well with the experimental observations, demonstrating that the proposed model can effectively describe the long‐term settlement behavior of the pile‐soil system.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"31 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149019773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Implicit and Semi‐Implicit SPH Schemes for Large Deformation Problems in Geomechanics 地质力学中大变形问题的隐式和半隐式SPH格式

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-09-21 DOI: 10.1002/nag.70445

Jun Geng, Ronaldo I. Borja

{"title":"Implicit and Semi‐Implicit SPH Schemes for Large Deformation Problems in Geomechanics","authors":"Jun Geng, Ronaldo I. Borja","doi":"10.1002/nag.70445","DOIUrl":"https://doi.org/10.1002/nag.70445","url":null,"abstract":"We present an implicit time integration scheme for smoothed particle hydrodynamics (SPH) employing multiplicative elastoplasticity in the finite deformation range. Time integration is based on the one‐step, unconditionally stable Newmark method formulated using an updated Lagrangian description. A novelty of the paper is an implicit evaluation of all variables including the neighbor lists of the SPH particles. The implicit scheme simplifies to a predictor–corrector (semi‐implicit) scheme when the zeroth iteration is taken as the predictor phase and the first iteration is taken as the corrector phase. We show that both schemes provide significant numerical stabilization of the SPH solution even with larger time steps and without the use of an artificial viscosity—a marked improvement over existing explicit SPH algorithms that rely on the satisfaction of the Courant–Friedrichs–Lewy condition and on artificial viscosity for stabilization. We demonstrate the robustness of the implicit and predictor–corrector schemes using benchmark examples that include sand column collapse and granular flow on an inclined flume.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"475 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149019982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hypoplastic Model for Unsaturated Soils With Degree of Saturation Dependent Stiffness 具有饱和度相关刚度的非饱和土欠塑性模型

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-09-18 DOI: 10.1002/nag.70438

Shanujah Mathuranayagam, William Fuentes, Samanthika Liyanapathirana, Jan Machaček

{"title":"Hypoplastic Model for Unsaturated Soils With Degree of Saturation Dependent Stiffness","authors":"Shanujah Mathuranayagam, William Fuentes, Samanthika Liyanapathirana, Jan Machaček","doi":"10.1002/nag.70438","DOIUrl":"https://doi.org/10.1002/nag.70438","url":null,"abstract":"This paper presents an enhanced hydro‐mechanically coupled hypoplastic constitutive model for unsaturated soils, developed by extending an existing framework, with particular emphasis on improving the stiffness formulation to better capture the influence of the degree of saturation. The existing framework links Bishop's effective stress to the strain rate and incorporates a degree of saturation‐dependent normal consolidation line (NCL), enabling it to reproduce the volumetric collapse behavior observed during wetting. Although this framework has successfully reproduced key aspects of unsaturated soil behavior while remaining consistent with established theoretical and thermodynamic principles, recent numerical investigations have revealed the occurrence of inadmissible stress states, indicating the need for further refinement. To address these limitations, two key enhancements are introduced in this study: (i) an improved formulation of the bulk modulus (K) to incorporate the effects of degree of saturation, and (ii) the inclusion of overconsolidation ratio (OCR) dependency in the unsaturated soil response. The revised bulk modulus formulation is validated with experimental measurements and previous models at very small strains, using data from four different soil types. The enhanced model is implemented within the INCREMENTAL DRIVER platform using a user‐defined material subroutine. Simulations of triaxial tests from the literature, involving various stress paths for two different clays, were also conducted. Comparative analyses with experimental results and earlier model versions clearly demonstrate the improved predictive performance of the proposed enhancements.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"13 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149009787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0