International Journal for Numerical and Analytical Methods in Geomechanics最新文献

{"title":"A Seismic Model for the Periodic Pile-Plate Road Foundation Based on the P2.5D Finite Element Method","authors":"Jian-Fei Lu,&nbsp;Qiang-Jun Fan,&nbsp;Yang Liu","doi":"10.1002/nag.3945","DOIUrl":"10.1002/nag.3945","url":null,"abstract":"<div>\u0000 \u0000 <p>Pile-plate road foundation (PRF) is a new type of road foundation arising in recent years. As the seismic wave is an important kind of dynamic loads, the dynamic analysis of the PRF under seismic wave is thus necessary for its dynamic design. To simplify the analysis of the PRF under seismic waves, the PRF is simplified as the periodic pile-plate road foundation (PPRF) in this study. To establish the dynamic model for this PPRF, the PPRF is divided into two regions first, namely, the regions I and II. Region I is the region of interest of the PPRF, containing the bedrock, soil layers, embankment, pile rows, and plate, while the region II is the surrounding domain for the region I, including the soil layers and bedrock. In this study, the region I is treated by the periodic 2.5D finite element method (P2.5D FEM) and corresponding P2.5D FEM equations are obtained. For the region II, the periodic thin layer method (PTLM) is established and is used to establish the traction-displacement relation at the regions I–II interface. With the obtained traction-displacement relation, the transmitting boundary condition is imposed on the region I, and the incident seismic wave is input to the region I, yielding the P2.5D FE-TLM model for the PPRF. Based on the established P2.5D FE-TLM model, some results for the response of the PPRF to the incident surface waves are presented.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 5","pages":"1506-1529"},"PeriodicalIF":3.4,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142961482","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}

{"title":"Investigation of the Shear Mechanism at the Interface Between Grout and Brittle Rock: Physical Testing and PFC3D Simulation","authors":"Jinwei Fu,&nbsp;Hadi Haeri,&nbsp;Vahab Sarfarazi,&nbsp;Negin Rafiei,&nbsp;Amir Abbas Amiri,&nbsp;Mohammad Fatehi Marji","doi":"10.1002/nag.3944","DOIUrl":"10.1002/nag.3944","url":null,"abstract":"<div>\u0000 \u0000 <p>Experimental tests were conducted in the laboratory to investigate the shear behavior of interfaces in grout-gypsum specimens. Various specimens were created to produce different interface configurations for testing and modeling. The tensile strength measurements indicated that grout has a strength of 1.2 MPa, while gypsum measures 0.52 MPa. For Young's modulus, grout was found to be 9 GPa, in contrast to gypsum's 4 GPa. Furthermore, the compressive strength values recorded were 13 MPa for grout and 7.9 MPa for gypsum. The fracture toughness values were found to be 0.09 MPa <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>√</mi>\u0000 <mi>m</mi>\u0000 </mrow>\u0000 <annotation>$surd m$</annotation>\u0000 </semantics></math> for grout and 0.01 MPa <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>√</mi>\u0000 <mi>m</mi>\u0000 </mrow>\u0000 <annotation>$surd m$</annotation>\u0000 </semantics></math> for gypsum. The rate of loading during the experimental tests was set at 0.05 mm/s, which was considered too low to satisfy the static loading criteria. Additionally, the laboratory tests helped calibrate the PFC modeling results, allowing for a detailed study of the shear behavior of the grout-gypsum interfaces. The number of channels in the specimens created suitable interfaces, which influenced the shear failure mechanisms and fracturing patterns for both sample types. Tensile cracking can occur at these interfaces and may propagate throughout the channels. As the number of channels increases, the volume of injected gypsum in the specimens also rises. This increase raises the crack initiation stress, failure stress, shear stiffness, and the number of fractures. Moreover, the shear stiffness and shear strength of the grout injection channels were found to be greater than those of the gypsum channels. Overall, there was a strong correlation between the experimental and numerical results.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 5","pages":"1491-1505"},"PeriodicalIF":3.4,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142961483","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}

{"title":"Granular Thermodynamic Migration Model Suitable for High-Alkalinity Red Mud Filtrates and Test Verification","authors":"Bing Bai,&nbsp;Haiyan Wu,&nbsp;Qingke Nie,&nbsp;Jingjing Liu,&nbsp;Xiangxin Jia","doi":"10.1002/nag.3946","DOIUrl":"10.1002/nag.3946","url":null,"abstract":"<div>\u0000 \u0000 <p>A theoretical model of the migration process of high-alkalinity red mud particles in porous media was derived from granular thermodynamics, complying with the complementary motion process of two-phase flows (i.e., hydroxide ions and red mud powder). From the perspective of energy dissipation provoked by particle migration and molecular thermal motion, a migration model of hydroxide ions and suspended particles under mixed conditions was established. This model naturally considers the complex adsorption/desorption process between hydroxide ions (or red mud particles) and a porous medium solid matrix, as well as between hydroxide ions and red mud particles. Moreover, the model reveals the dynamic process and deposition effect of suspended powder under multiphase interactions during temporal and spatial variations. The migration progression of suspended substances in the process of transient injection of red mud filtrate with different pH values and the continuous change in red mud particle injection were verified by experiments.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 5","pages":"1530-1543"},"PeriodicalIF":3.4,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142961480","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}

{"title":"An Improved Park-Paulino-Roesler (PPR) Cohesive Model Considering Rate-Dependent Characteristics and Frictional Behavior of Brittle Materials","authors":"Jiang Yu,&nbsp;Tingting Wang,&nbsp;Kai Liu,&nbsp;Chun'an Tang","doi":"10.1002/nag.3938","DOIUrl":"10.1002/nag.3938","url":null,"abstract":"<div>\u0000 \u0000 <p>To characterize the rate-dependency and frictional behavior of quasi-brittle interface material, a coupling rate-dependent and friction interface model improved from the Park-Paulino-Roesler (PPR) cohesive model, is proposed and validated in this paper. Based on the potential function, this novel coupling model forms the basic relationship of traction-displacement within the interfaces, in which rate effect and friction behavior are considered by constructing a rate-sensitive item and smooth friction term, respectively. Specifically, governing equations for typical mode I and mode II crack formation, as well as for normal and tangential directions, are established, and the model includes a complete unloading/reloading mode for the complex loading situations. To validate this model, the 3D simplified shear test of the anchor rod and mortar block model and a three-point bend test of the composite concrete-FRP beam with different loading rates are established to verify the engineering availability, considering different loading rates and friction coefficients. The results show that shear and tensile behaviors of brittle material in numerical models and laboratory tests are similar in the fracture initiation and propagation characteristics. The proposed model can reflect not only the elastic, softening, and residual stages, but also the strength rate-related effects and friction effects of interface materials. This provides a comprehensive solution for describing the complex mechanical behavior of quasi-brittle materials subjected to tensile and shear loads.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 5","pages":"1471-1490"},"PeriodicalIF":3.4,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142961481","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}

{"title":"Dynamic Torsional Response of Pile in Fractional-Order Viscoelastic Unsaturated Transversely Isotropic Soil With Imperfect Contact","authors":"Wenjie Ma,&nbsp;Eng-Choon Leong,&nbsp;Xu Wang,&nbsp;Binglong Wang,&nbsp;Changdan Wang,&nbsp;Bolin Wang","doi":"10.1002/nag.3943","DOIUrl":"10.1002/nag.3943","url":null,"abstract":"<div>\u0000 \u0000 <p>A novel theoretical model is proposed to investigate the torsional response of a pile in fractional-order viscoelastic unsaturated transversely isotropic soil with imperfect contact. This model employs Biot's framework for three-phase porous media along with the theory of fractional derivatives. Unlike previous models that assume continuous displacement at the pile–soil interface, this study uses the Kelvin model to simulate relative slippage between pile–soil contact surfaces (imperfect contact). Incorporating fractional-order viscoelastic and transversely isotropic models to describe the stress-strain relationship, comprehensive dynamic governing equations are derived. Using the separation of variables method, inverse Fourier transform, and convolution theory, analytical solutions for the frequency domain response and semi-analytical solutions for the time domain response of the pile head under semi-sine pulse excitation are obtained. Using numerical examples, the effects of model parameters in the fractional-order viscoelastic constitutive model, pile–soil relative slip and continuity model, and soil anisotropy on the torsional complex impedance, twist angle, and torque are presented.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 5","pages":"1448-1470"},"PeriodicalIF":3.4,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142940431","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}

{"title":"A Thermomechanical Model of Coarse-Grained Soils With Non-Orthogonal Flow Rule","authors":"Zengchun Sun,&nbsp;Yang Xiao,&nbsp;Qingyun Fang,&nbsp;Xiang Jiang,&nbsp;Xiang He,&nbsp;Hanlong Liu","doi":"10.1002/nag.3942","DOIUrl":"10.1002/nag.3942","url":null,"abstract":"<div>\u0000 \u0000 <p>In geo-energy engineering projects, temperature is an essential environmental variable, and accurately predicting its effect on the thermomechanical properties of geomaterials remains a challenge. Similar to fine-grained soils, temperature variation is also a crucial factor that affects the stress-strain response and critical state behavior of coarse-grained soils. In this study, a thermomechanical model is established for coarse-grained soils using theories from the critical state and fractional plasticity. The evolution of the critical state line with increasing temperature can be well characterized by introducing a thermal-dependent parameter, then the state void-ratio-pressure parameter that incorporates the effect of temperature can be derived according to the temperature-dependent critical state. The plastic flow direction and dilatancy function are obtained directly from the fractional derivation of the modified elliptical yield function to describe the nonassociated flow characteristics. Furthermore, the thermal state parameter is introduced into the non-orthogonal dilatancy function and hardening modulus to reflect the state- and temperature-dependent behaviors. Comparative analysis of experimental data and predictions indicates that the established thermomechanical model can reasonably predict the drained shear characteristics of coarse-grained soils under different temperatures, including strain-hardening, strain-softening, dilatancy, contraction, and thermal softening.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 5","pages":"1437-1447"},"PeriodicalIF":3.4,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142940430","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}

{"title":"A Discrete Element Method–Based Energetic Approach to Model Two-Dimensional Fatigue Crack Propagation","authors":"Lei Ma,&nbsp;Georg Koval,&nbsp;Cyrille Chazallon,&nbsp;Yannick Descantes","doi":"10.1002/nag.3928","DOIUrl":"10.1002/nag.3928","url":null,"abstract":"<p>In this work, a fatigue crack propagation model is proposed using the two-dimensional discrete element method (DEM). The challenge lies in describing the small progressive fatigue crack growth within a single cycle, which is typically much smaller than the size of the smallest particles, making it difficult to continuously capture the loss of contact stiffness. To accurately represent crack increments in DEM, a reduction in contact stiffness is directly linked to the length of the propagated crack, based on the local energy release in a contact. This allows for a precise description of crack increments at scales much smaller than particle size. Building on this, and utilizing the local evaluation of the energy release rate, Paris' law is applied to describe the fatigue behaviour of the contact under cyclic loading. An efficient approach is introduced that replaces the full cycle analysis with equivalent quasi-static monotonic simulations, leading to significant gains in computational time. The resultant DEM simulations adopt the same parameters as in continuum mechanics, eliminating the need for calibration, and demonstrate good agreement with theoretical and experimental results from the literature.</p>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 5","pages":"1420-1436"},"PeriodicalIF":3.4,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/nag.3928","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142940432","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}

{"title":"Effects of Random Field Heterogeneity of Spatial Soil Properties on the Bearing Capacity of Neighbouring Footing","authors":"Yada Tesfaye Boru,&nbsp;Joanna Pieczyńska-Kozłowska,&nbsp;Wojciech Puła","doi":"10.1002/nag.3932","DOIUrl":"10.1002/nag.3932","url":null,"abstract":"<div>\u0000 \u0000 <p>The study presents a comprehensive study on the assessment of the bearing capacity of closely spaced strip footings on c-ø soil, considering spatial variability in soil properties. A linear elastic model is employed for footings and elastic–perfect plastic soil behaviour via the Mohr–Coulomb yield criterion. Soil properties obtained from extensive field investigations of Taranto Blue Clay (TBC) in Italy are modelled as stationary random fields (RFs) generated using the Fourier series method. The cohesion and friction angle RFs are integrated with the Z-soil FE code. The final results are obtained according to the random finite element method (RFEM). The study investigates the influence of spacing distances between footings and spatial correlation lengths of soil parameters on the bearing capacity. Results show how spacing distance affects bearing capacity. Moreover, it indicates that neighbouring footing bearing capacity is strongly correlated with investigated parameters. In the case of small spatial correlation lengths, the patterns were obtained as non-symmetrical, transitioning to more symmetrical patterns at larger lengths. The manuscript concludes by presenting reliability-based design considerations for the ultimate bearing capacity, considering the horizontal spatial scale of fluctuation (SOF). The findings emphasize the importance of evaluating allowable design bearing capacity for proximity structures using RFEM and provide valuable insights into the interplay between spacing distances and spatial variability in soil properties. To this end, the study underscores the critical interplay between spacing distance, spatial correlation lengths, and random soil properties in assessing neighbouring footing-bearing capacities.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 5","pages":"1408-1419"},"PeriodicalIF":3.4,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929129","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}

{"title":"Poromechanical Solution for One-Dimensional Large Strain Consolidation of Modified Cam-Clay Soil","authors":"Sheng-Li Chen,&nbsp;Hai-Sui Yu,&nbsp;Younane N. Abousleiman,&nbsp;Christopher E. Kees","doi":"10.1002/nag.3924","DOIUrl":"10.1002/nag.3924","url":null,"abstract":"<div>\u0000 \u0000 <p>A theoretical model describing the one-dimensional large strain consolidation of the modified Cam-Clay soil is presented in this paper. The model is based on the Lagrangian formulation and is capable of featuring the variability of soil compressibility (inherently due to the direct incorporation of the specific Cam-Clay plasticity model) and permeability, as well as the impact of the overconsolidation ratio (OCR). The derivation starts from the establishment of the incremental stress–strain relations for both purely elastic and elastoplastic deformations under one-dimensional compression conditions, and thereafter the coefficients of compressibility/volume change that are essential to the consolidation analysis. The governing partial differential equation is then neatly deduced in conjunction with the continuity and equilibrium conditions for the soil, with the vertical effective stress being the privileged unknown to be solved for. Subsequently, a semi-analytical solution to the developed rigorous poroelastoplastic large strain consolidation model is obtained and verified with the ABAQUS finite element numerical results. Parametric analyses are finally provided to investigate in detail the influences of the soil overconsolidation ratio, large strain configuration, and the variability of the soil permeability on the calculated one-dimensional consolidation response.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 5","pages":"1396-1407"},"PeriodicalIF":3.4,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142934885","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}

{"title":"Stress Distribution Around Arbitrarily Shaped Shallow Buried Tunnels in Transversely Isotropic Rock Mass","authors":"Zhi Yong Ai,&nbsp;Qi Liang,&nbsp;Zi Kun Ye,&nbsp;Ke Xin Hu","doi":"10.1002/nag.3936","DOIUrl":"10.1002/nag.3936","url":null,"abstract":"<div>\u0000 \u0000 <p>In this paper, the stress solutions around shallow buried tunnels with arbitrary shapes in transversely isotropic rock mass are derived. First, the hybrid penalty function method is employed to derive the mapping function from an arbitrarily shaped tunnel to a unit circle in the complex plane. Then the complex function method and the Schwartz alternating method are used to derive the solution of the studied problem. A MATLAB program is developed on the basis of the presented theory. Thereafter, the finite element results of ABAQUS are compared with those obtained by the presented solutions, which confirms the theoretical and computational accuracy of the proposed approach, and the impacts of transverse isotropy, tunnel depth, and tunnel shape on the surrounding rock stresses are discussed.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 5","pages":"1378-1395"},"PeriodicalIF":3.4,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142924996","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}