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

{"title":"Optimization Design of Stiffened Deep Cement Mixing Piles and Geogrid for Ground Improvement to Support High-Speed Railway Embankments in Central Vietnam","authors":"Van-Ngoc Pham,&nbsp;Erwin Oh","doi":"10.1002/nag.70042","DOIUrl":"10.1002/nag.70042","url":null,"abstract":"<div>\u0000 \u0000 <p>High-speed railways (HSR) have been developed remarkably in recent decades as a major public transportation mode in many countries. The stability of embankments under HSR operation is a critical and technical challenge. Thus, this study aims to investigate the effectiveness of stiffened deep cement mixing piles (SDCM) combined with geogrid to minimize embankment settlement under HSR conditions. PLAXIS 2D axisymmetric models were created and automatically controlled using the Python wrapper for remote scripting to investigate a wide range of input variables and several combination scenarios. Selected input parameters include the thickness of the soft soil layer, SDCM pile dimensions (diameter and length), embankment height, and train load characteristics (axle loads, dynamic factors, train speeds, and dead loads). As a result, approximately 324 points of data on the settlement of the HSR embankment were extracted from FEM analysis conveniently. Besides, a Gene-Expression Programming (GEP) algorithm was applied to generate a reliable model for estimating the settlement of the HSR embankment. A parametric study indicates that the HSR embankment settlement increases considerably whether the soft soil layer is thick, the embankment is high, or the train is heavy and fast. In contrast, enlarging the diameter and the length of SDCM piles could significantly reduce overall settlement. The study offers practical insights for reducing design efforts using advanced FEM analysis for HSR embankments. These findings are a valuable resource for engineers involved in upcoming HSR projects in Vietnam.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 16","pages":"3630-3647"},"PeriodicalIF":3.6,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144850801","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 Reconstruction and Expansion Strengthening via Unilateral Directional Roof Cutting for Roadway-Surface Synergistic Protection","authors":"Jingchen Qi,&nbsp;Manchao He,&nbsp;Zijing Peng,&nbsp;Yubing Gao,&nbsp;Kai Liu","doi":"10.1002/nag.70038","DOIUrl":"https://doi.org/10.1002/nag.70038","url":null,"abstract":"<div>\u0000 \u0000 <p>Traditional caving mining methods in shallow coal seams often lead to roadway instability and ground subsidence, posing significant challenges to sustainable coal extraction. To address these issues, this study proposes an innovative mining technique based on unilateral directional roof cutting (UDRC) and investigates its geomechanical mechanisms through integrated numerical–analytical modeling and physical experiments. Taking the 44,203 working face of the Hongliulin coal mine as a case study, a modified cantilever beam mechanical model is first developed to characterize the stress redistribution caused by UDRC. This model explicitly links roof fracturing patterns with the optimization of stress transmission paths. A combined approach integrating physical model experiments and UDEC-based numerical simulations is then used to investigate the dynamic evolution of roof failure, gangue bulking characteristics, and stress transfer mechanisms. Results demonstrate that UDRC technology reduces vertical stress concentration in coal ribs by 22.2% through targeted directional fracturing, while enhancing gangue expansion coefficients from 1.21 to 1.40, achieving 93% gob compaction efficiency. The convergence of both roadway ribs decreased by 33.02%, the roof-floor convergence decreased by 46.69%, and surface subsidence by 81.6% compared to conventional methods. Field validations confirm that the proposed dual-path control framework—combining stress field reconstruction with the self-organized dilatancy of fragmented strata—provides a reliable numerical and analytical basis for optimizing shallow coal seam mining. This work advances geo-mechanical modeling by integrating waste utilization mechanics with stress-path design, offering a transformative approach to eco-efficient underground resource extraction.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 16","pages":"3553-3573"},"PeriodicalIF":3.6,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248752","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 Method for Testing Rock Mass Elastic Modulus Based on Anchor Pullout Tests and Its Optimization","authors":"Jinpeng Zhao,&nbsp;Wenjie Fu,&nbsp;Shihao Yuan,&nbsp;Xiaoli Liu,&nbsp;Qing Ma","doi":"10.1002/nag.70036","DOIUrl":"https://doi.org/10.1002/nag.70036","url":null,"abstract":"<div>\u0000 \u0000 <p>To achieve rapid and accurate acquisition of field parameters in underground and geotechnical engineering, this paper proposes a novel method for inverting the elastic modulus of rock mass based on anchor pullout tests. First, the main failure modes of the anchoring system during pullout are systematically analyzed, clarifying the characteristics of different failure mechanisms. Second, a theoretical model based on shear stress distribution is established, deriving the relationship between end load and end displacement under elastic conditions to provide a theoretical foundation for the inversion of the rock mass elastic modulus. On this basis, combined with actual field test data, a feedback correction technique integrating linear fitting and numerical simulation is employed to optimize the influence range parameters and improve the accuracy of the inverted results. Validation through multiple typical engineering cases shows that the deviation of the obtained rock mass elastic modulus generally falls within about 5.7% to 12.5%, demonstrating good practicality and reliability. The study also notes that, due to simplifications in considering material nonlinearities and plastic deformations, the model has certain limitations, and future work should incorporate more complex nonlinear material models for further improvements. This method offers an efficient and straightforward approach for rapid inversion of rock mass parameters, supporting safer and more precise engineering design in underground excavation, tunnel construction, and mining projects.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 15","pages":"3531-3547"},"PeriodicalIF":3.6,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100891","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 Novel Numerical Model for Coupled Large-Strain Consolidation and Solute Transport in Clayey Soils Considering Chemico-Osmotic and Creep Deformation","authors":"Peng-Lin Li,&nbsp;Ding-Bao Song,&nbsp;Zhen-Yu Yin,&nbsp;Jian-Hua Yin","doi":"10.1002/nag.70030","DOIUrl":"10.1002/nag.70030","url":null,"abstract":"<div>\u0000 \u0000 <p>Contaminated geomaterials in CDFs (confined disposal facilities) and CCLs (compacted clay layers) typically undergo a long-term process involving coupled finite strain consolidation and solute transport, posing challenges for fully coupled modeling. To fill this research gap, a novel finite strain consolidation-solute transport model incorporating chemico-osmotic and creep effects is developed. The predictive accuracy of the model is verified through comparisons with existing analytical and numerical solute transport models with consolidation effect, a finite-strain consolidation model, and a small-strain HMC (hydro-mechanical-chemo) model. The model effectively replicates oedometer tests with one-step and three-step salinization, revealing significant volume changes (15.6% and 5.74% for two tests) due to chemical loading, even larger than those (5.31% and 5.13%) due to mechanical loading. Finally, parametric studies highlight the influence of creep, compressibility, boundary conditions, initial concentration distribution, and adsorption, demonstrating that chemico-osmotic effects can generate large negative pore pressures (50% of initial pore pressure) and average consolidation degree (about 140%). Compared with consolidation-related parameters, the adsorption coefficient has a more noticeable effect on solute transport, leading to bottom concentration values ranging from 54% to 25% of the boundary concentration value as the adsorption coefficient increases from 0 to 1.5 mL/g. Overall, consolidation exhibits greater sensitivity to parameter variations than solute transport in these cases.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 15","pages":"3509-3530"},"PeriodicalIF":3.6,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144792263","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":"Neohypoplasticity for Sand Coupled With the Generalized Intergranular Strain Concept","authors":"Luis Mugele,&nbsp;Hans Henning Stutz,&nbsp;David Mašín","doi":"10.1002/nag.70027","DOIUrl":"10.1002/nag.70027","url":null,"abstract":"<p>This work presents the coupling of the recently revisited advanced hypoplastic constitutive sand model called neohypoplasticity (NHP) with the more recently introduced concept of the generalized intergranular strain (GIS) to account for soil behavior due to small strains. The latter is essential for the simulation of cyclic deformations. In addition to the effective Cauchy-stress <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>σ</mi>\u0000 </mrow>\u0000 <annotation>$bm {sigma }$</annotation>\u0000 </semantics></math> and the void ratio <span></span><math>\u0000 <semantics>\u0000 <mi>e</mi>\u0000 <annotation>$e$</annotation>\u0000 </semantics></math>, the resulting NHP+GIS formulation includes a fabric tensor <span></span><math>\u0000 <semantics>\u0000 <mi>z</mi>\u0000 <annotation>$bm {z}$</annotation>\u0000 </semantics></math> (to account for the anisotropic soil structure), the intergranular strain <span></span><math>\u0000 <semantics>\u0000 <mi>h</mi>\u0000 <annotation>$bm {h}$</annotation>\u0000 </semantics></math>, and a cyclic preloading variable <span></span><math>\u0000 <semantics>\u0000 <mi>Ω</mi>\u0000 <annotation>$Omega$</annotation>\u0000 </semantics></math> as state variables. The parameter calibration of the 11 NHP and 10 GIS parameters is discussed in detail and significantly simplified compared to previous NHP versions. Element test simulations of monotonic and cyclic tests and their comparison with experimental data from Karlsruhe fine sand (KFS) and Zbraslav sand (ZS) reveal the satisfying performance of the novel model. The NHP+GIS model captures soil anisotropy effects and static liquefaction in loose sand. Cyclic mobility can be modeled irrespective of soil density. Finally, the NHP+GIS model is applied to a bifurcation problem under plane strain conditions, demonstrating its applicability in initial boundary value problems.</p>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 15","pages":"3484-3508"},"PeriodicalIF":3.6,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/nag.70027","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144770000","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":"Seismic Reliability Assessment of Anti-Sliding Pile Reinforced Slopes Considering Coupled Randomness of Ground Motions and Shear Strength Parameters via DPIM","authors":"Kehao Chen,&nbsp;Xu Li,&nbsp;Pang Rui,&nbsp;Yang Zhou,&nbsp;Bin Xu","doi":"10.1002/nag.70024","DOIUrl":"10.1002/nag.70024","url":null,"abstract":"<div>\u0000 \u0000 <p>Slope instability under seismic loading is a common geohazard, and the inherent randomness of both seismic excitations and soil properties further exacerbates the uncertainty in slope reliability assessments. This study proposes a novel framework for evaluating the seismic reliability of slopes from a probabilistic and statistical perspective. Stochastic ground motions and random soil parameters were generated using the spectral expression–random function (SERF) method and the generalized F-discrepancy method, respectively. The random factors were incorporated into the finite element model to perform a series of deterministic time-history analyses. Subsequently, statistical and probabilistic information was extracted from these time-history analysis results using the direct probability integration method (DPIM), enabling a comprehensive evaluation of slope performance under seismic loading. The proposed framework was applied to a real-world excavated slope, and three representative cases were analyzed. The influence of randomness in both soil parameters and seismic inputs on the stochastic response and seismic reliability of slopes reinforced with anti-sliding piles was systematically compared. The results demonstrate that, even under stochastic conditions, anti-sliding piles significantly enhance slope stability. However, the introduction of random factors markedly increases the variability in slope response and contributes to higher uncertainty in reliability outcomes. Overall, these findings highlight the necessity of incorporating seismic and soil parameter randomness into seismic slope reliability assessments to accurately capture system behavior and risk.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 15","pages":"3471-3483"},"PeriodicalIF":3.6,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144747275","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 Global Matrix Method for Arbitrary Types of Layered Media Based on Generalized Saturated Porous Medium Model","authors":"Hongquan Liu,&nbsp;Shaolin Chen,&nbsp;Jiao Zhang,&nbsp;Yanhong Zhang","doi":"10.1002/nag.70022","DOIUrl":"10.1002/nag.70022","url":null,"abstract":"<div>\u0000 \u0000 <p>Realistic shallow surface models often contain layered configurations of different types of media, which poses a challenge to wave propagation simulation. The traditional transfer matrix method requires cumbersome re-deriving of formulas and re-programming when dealing with different layered configurations. In this study, a unified algorithm, termed the global matrix method, is derived based on generalized saturated porous medium model for solving wave problems for arbitrary types of layered media (including fluid, solid, and saturated porous media) and their arbitrary combinations. The discontinuous properties between two different media are handled by a novel, universal interface continuity condition. The global matrix method is applied to solve the plane wave problem for three typical layered configurations, including the layered marine site, the layered soils containing groundwater, and the layered polar marine site overlying ice sheets. Furthermore, the effects of some parameters on the results are also analyzed. The results sufficiently illustrate the correctness of the global matrix method and its generality for different layered configurations. In any case, this method provides a uniform and convenient option for solving the free field for earthquake engineering.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 15","pages":"3435-3451"},"PeriodicalIF":3.6,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737007","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 Method for Determining Constriction Size Distribution Using Discrete Element Method and Its Inspiration for Corresponding Laboratory Tests","authors":"Xiang He,&nbsp;Yao Chen,&nbsp;Haijun Hu,&nbsp;Shunxiang Kang,&nbsp;Shaohong Zhang,&nbsp;Meixiao Yang","doi":"10.1002/nag.70020","DOIUrl":"10.1002/nag.70020","url":null,"abstract":"<div>\u0000 \u0000 <p>Constriction is defined as the narrowest passages between pores, and constriction size distribution (CSD) is a fundamental property that quantifies the soil retention capability of filters. Although three types of methods have been developed to determine the CSD, that is, analytical, numerical, and experimental methods, these approaches face limitations such as potential inaccuracies or limited applicability. In this paper, the inverse method combined with discrete element method (DEM) proposed by Sjah and Vincens (2013) was improved from several facets, that is, the characterization of the mean distance between adjacent constrictions, the generation of probe particles instead of base soils, the determination of actual path length for probe particles, and the deletion of clogged particles. Then the improved method was compared with the previous one and other analytical and numerical methods. Besides, different confidence levels, that is, maximum probability of failing to traverse through constrictions continuously, were selected in the improved inverse method to investigate the effect of this value on CSD. Furthermore, the effect of probe particles path tortuosity, the clogging of probe particles within the filter, and filter particle shape on CSD were investigated. These findings provide insights for improving the accuracy of CSD determination in laboratory tests.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 15","pages":"3422-3434"},"PeriodicalIF":3.6,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144766093","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":"Numerical Analysis of Soil Consolidation and Time-Dependent Skin Friction Mobilization Around Permeable Pipe Pile","authors":"Yulin Lu,&nbsp;Yunpeng Zhang,&nbsp;Guoxiong Mei,&nbsp;M. Hesham El Naggar,&nbsp;Wenbing Wu","doi":"10.1002/nag.70028","DOIUrl":"10.1002/nag.70028","url":null,"abstract":"<div>\u0000 \u0000 <p>The rapid mobilization of the capacity of precast-driven piles is closely tied to the consolidation of the surrounding soil. Permeable pipe piles, which function as both load-bearing foundations and drainage pathways, offer the advantage of quick capacity mobilization. However, the absence of a time-dependent theory for permeable pipe pile–soil interaction significantly limits the advancement and widespread application of this innovative pile technology. This study proposes a numerical framework to analyze soil consolidation and skin friction development along the shaft of permeable pipe piles. The framework is validated through comparisons with simplified theoretical solutions and experimental results. A parametric analysis is conducted to elucidate the capacity mobilization process, providing guidance for optimizing the design of permeable pipe piles.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 15","pages":"3452-3470"},"PeriodicalIF":3.6,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144766088","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":"Analytical Solution for Stresses and Displacements of Deep Tunnels With Rockbolts Support Subjected to P and SV Waves","authors":"Gong Chen,&nbsp;Haitao Yu","doi":"10.1002/nag.70021","DOIUrl":"10.1002/nag.70021","url":null,"abstract":"<div>\u0000 \u0000 <p>Rockbolt support is one of the most commonly used reinforcement measures for rock tunnels. It is important to explore the effect of rockbolts on seismic design of tunnel structures, and therefore, a design method is required for the evaluation of such effect, which was, however, still vacant in current studies. In this paper, a novel analytical solution for the seismic response of deep tunnels with rockbolts support subjected to P and SV waves is presented. The rockbolts support region is assumed to be cylindrical and anisotropic based on the equivalent material method, and the ground and liner are considered homogenous, isotropic, and linear elastic. The general solutions for the response of a cylindrical anisotropic layer subjected to arbitrary dynamic loading are derived using generalized power series. The convergence and the linear independence of the solutions are proved. Then, the solutions for displacements and stresses of the tunnel liner are obtained by utilizing these proposed general solutions. The validity of the proposed solution is demonstrated by comparing its results and those from FEM. Parametric analysis is presented with the solution where the influences of the rockbolts length and modulus of the equivalent layer reinforced by the rockbolts support on seismic responses of deep tunnels are investigated.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"49 15","pages":"3357-3374"},"PeriodicalIF":3.6,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144712262","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}