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

Effects of Cementation Fabric on the Mechanical Behaviour of Bio‐Cemented Sands: Two Cementing Approaches in DEM Simulations 胶结结构对生物胶结砂力学行为的影响：两种胶结方法在DEM模拟中的应用

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-10-19 DOI: 10.1002/nag.70462

Aoxi Zhang, Chaofa Zhao, Zhongxuan Yang

{"title":"Effects of Cementation Fabric on the Mechanical Behaviour of Bio‐Cemented Sands: Two Cementing Approaches in DEM Simulations","authors":"Aoxi Zhang, Chaofa Zhao, Zhongxuan Yang","doi":"10.1002/nag.70462","DOIUrl":"https://doi.org/10.1002/nag.70462","url":null,"abstract":"Bio‐cementation methods such as microbially induced carbonate precipitation (MICP) enhance soil strength through calcite precipitation, yet the influence of cementation fabric, defined as the directional distribution of cemented bonds, on mechanical behaviour has remained largely unexplored, despite experimental evidence that calcite can develop preferential orientations. This study provides a systematic investigation of cementation fabric in bio‐cemented sands using the discrete element method (DEM), and, in doing so, the first quantitative comparison of the two established DEM cementing approaches, namely virtual bonds and cohesive fines, within a unified framework. Specimens with four principal cementation orientations (i.e., , , , ) are prepared at an equivalent cementation level to isolate the effect of cementation fabric. Results demonstrate that cementation fabric significantly influences the mechanical behaviour: the specimen with a principal cementation orientation perpendicular to the loading direction achieves the maximum strength enhancement, while the one aligned with the loading direction exhibits the smallest strength enhancement. Furthermore, while the two cementing approaches yield consistent macroscopic mechanical behaviour, microscopic variables (e.g., coordination number and fabric anisotropy) vary significantly, resulting in approach‐specific interpretations of micromechanical mechanisms. This indicates that the choice of DEM cementing approach should be carefully considered based on the specific research objectives, such as the development of fabric evolution laws and micromechanics‐based constitutive models for bio‐cemented granular soils.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"56 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149218778","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

A Fully Connected Neural Network Enhanced Peridynamic Framework for Efficient Simulation of Hydraulic Fracturing in Fractured Rocks 裂隙岩石水力压裂高效模拟的全连接神经网络增强周动力框架

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-10-15 DOI: 10.1002/nag.70463

Pengfei Ma, Zhenhua Pan, Chenglu Gao, Tianjun Feng, Tianwei Liu, Zhaoyang Deng, Qian Guo

{"title":"A Fully Connected Neural Network Enhanced Peridynamic Framework for Efficient Simulation of Hydraulic Fracturing in Fractured Rocks","authors":"Pengfei Ma, Zhenhua Pan, Chenglu Gao, Tianjun Feng, Tianwei Liu, Zhaoyang Deng, Qian Guo","doi":"10.1002/nag.70463","DOIUrl":"https://doi.org/10.1002/nag.70463","url":null,"abstract":"Hydraulic fracturing involves strong coupling among fluid flow, rock deformation and fracture evolution. Peridynamics can naturally represent crack initiation and propagation without explicit crack tracking, but repeated nonlocal seepage calculations make hydro‐mechanical simulations computationally demanding. This study develops a fully connected neural network‐enhanced peridynamic (FCNN–PD) framework in which a data‐driven surrogate predicts pore‐pressure fields and is coupled with the peridynamic mechanical and damage calculations. The network learns the relationship between nodal states, hydraulic loading, fracture geometry and pressure response. A case‐balanced sampling strategy is used, and several candidate input representations are compared to identify the information required for accurate prediction. The selected input representation includes coordinates, permeability, hydraulic conditions, fracture descriptors and spatial‐distance features. Independent tests yield a mean normalised root‐mean‐square error of 0.804% and a mean coefficient of determination of 0.99247, demonstrating high fidelity to the peridynamic reference solution. Sensitivity and generalisation analyses indicate stable performance within the investigated parameter range. Comparisons involving matrix flow, fracture flow, crack deformation and hydraulic fracturing further show that the coupled framework reproduces pressure, displacement and fracture responses with acceptable accuracy, while the predicted critical pressure differs from the experimental value by 8.27%. The proposed approach reduces the computational burden of peridynamic hydro‐mechanical analysis while preserving its capability to model fracture evolution, providing an efficient route for simulating fractured porous media. Further work should address complex fracture networks, broader loading histories and explicit conservation constraints.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"18 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149172663","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 Investigation of Shear Mode Effects on the Mechanical Behavior of Soil–Rock Mixtures 剪切模态对土石混合体力学特性影响的数值研究

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-10-15 DOI: 10.1002/nag.70452

Longzhen Zhao, Weichao Guo, Geyang Shen, Peng Song, Guiyin Jiang, Kai Li

{"title":"Numerical Investigation of Shear Mode Effects on the Mechanical Behavior of Soil–Rock Mixtures","authors":"Longzhen Zhao, Weichao Guo, Geyang Shen, Peng Song, Guiyin Jiang, Kai Li","doi":"10.1002/nag.70452","DOIUrl":"https://doi.org/10.1002/nag.70452","url":null,"abstract":"Soil‐rock mixture (SRM) is a widely distributed geomaterial that occurs not only as engineered backfill but also as the primary constituent of many natural slopes, making its shear behavior critical for geotechnical design and geological hazard assessment. However, its pronounced heterogeneity and complex particle interactions hinder the reliable determination of shear strength and deformation characteristics. This study employs the discrete element method (DEM) to investigate the shear behavior of SRM under direct shear and simple shear conditions with varying volumetric block proportions (VBPs) and normal stresses. The results show that direct shear tests generally yield lower shear stress and exhibit post‐peak strain softening, whereas simple shear tests display continuous deformation with stronger stress fluctuations under high normal stress. Although both shear modes present similar overall normal displacement trends, their coordination number evolution and energy dissipation characteristics differ markedly. In particular, coordination number fluctuations are more frequent in direct shear, while rolling energy dissipation shows distinct growth patterns between the two modes. At high VBP, direct shear is associated with concentrated force chains near the shear plane, whereas simple shear exhibits more spatially distributed force chains and shear zones.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"19 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149173004","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 Improved Smoothed Particle Hydrodynamics Method Applied to Crack Propagation and Deformation of Circular Deep Tunnels in Layered Rock 一种改进的光滑颗粒流体力学方法应用于层状岩石中圆形深隧道的裂纹扩展和变形

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-10-15 DOI: 10.1002/nag.70420

Shishu Zhang, Xiaoping Zhao, Meng Wang, Minzong Zheng, Liu Liu

{"title":"AN Improved Smoothed Particle Hydrodynamics Method Applied to Crack Propagation and Deformation of Circular Deep Tunnels in Layered Rock","authors":"Shishu Zhang, Xiaoping Zhao, Meng Wang, Minzong Zheng, Liu Liu","doi":"10.1002/nag.70420","DOIUrl":"https://doi.org/10.1002/nag.70420","url":null,"abstract":"To investigate the processes of crack propagation and deformation failure of surrounding rock induced by deep tunnel excavation in layered rock masses, the conventional smoothed particle hydrodynamics (SPH) method is improved. A novel numerical simulation approach, termed layered rock particle hydrodynamics (LRPH), is developed and corresponding models are established. The distribution of cracks, deformation at monitoring points, and the number of fractures at different strain stages are analyzed to examine the influences of bedding dip angle, lateral velocity coefficient, and deep tunnel location on the deformation and failure behavior of the surrounding rock. The numerical results demonstrate that LRPH overcomes the limitations of traditional mesh‐based methods and is capable of dynamically capturing the crack propagation process. The presence of bedding significantly affects the initiation location and subsequent propagation direction of cracks, leading to an increase in fracture density and greater convergence deformation of the surrounding rock. Bedding dip angle, lateral velocity coefficient, and deep tunnel position all influence the orientation of crack development, while a bedding dip angle of 45° has a relatively minor effect on the overall convergence deformation of the surrounding rock. The lateral velocity coefficient plays a dominant role in tunnel‐induced damage: higher coefficients result in more developed fractures and larger displacements at the deep tunnel crown. The findings provide valuable insights into the deformation and failure mechanisms of deep tunnels excavated in layered rock masses and further promote the application of SPH‐based methods in tunnel engineering.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"53 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149172664","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

Parameter Identification and Uncertainty Analysis of Stone‐Column‐Reinforced Composite Foundations Constrained by Static Load Tests 静载约束下石-柱-复合地基参数辨识及不确定度分析

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-10-14 DOI: 10.1002/nag.70458

Fei Wang, Huijun Qi, Li Yuan, Shiyang Pan, Chenbo Zhao, Tongchun Li, Qiankun Liu

{"title":"Parameter Identification and Uncertainty Analysis of Stone‐Column‐Reinforced Composite Foundations Constrained by Static Load Tests","authors":"Fei Wang, Huijun Qi, Li Yuan, Shiyang Pan, Chenbo Zhao, Tongchun Li, Qiankun Liu","doi":"10.1002/nag.70458","DOIUrl":"https://doi.org/10.1002/nag.70458","url":null,"abstract":"Accurate identification of constitutive parameters for stone‐column‐reinforced composite foundations is essential for deformation analysis and settlement prediction of clay‐core rockfill dams. However, the parameters of the Duncan‐Chang model are difficult to determine directly under field conditions, whereas conventional inversion methods relying on repeated finite element (FE) analyses are computationally expensive. To address this issue, this study proposes a surrogate‐assisted parameter inversion framework constrained by static load tests in the stone‐column‐reinforced composite foundation of a planned clay‐core rockfill dam in Rwanda. Response samples under staged loading were generated using FE simulations, and a surrogate model was introduced into the inversion loop as a computational substitute for repeated FE analyses, thereby improving inversion efficiency. By jointly calibrating settlement responses under multiple load levels, the Duncan‐Chang model parameters governing the overall load‐settlement behaviour of the composite foundation were identified. Furthermore, uncertainty analysis was conducted for a representative test column to obtain the posterior distributions of the key parameters and the parameter‐induced posterior prediction intervals of the load‐settlement response. The identified parameters were further validated through FE back‐analysis and dam‐scale settlement prediction. The results show that the proposed framework can satisfactorily reproduce the load‐settlement response observed in static load tests while substantially reducing the computational cost. This study demonstrates that surrogate‐assisted parameter inversion constrained by static load tests provides a practical and robust approach for parameter identification in stone‐column‐reinforced composite foundations, while maintaining a favourable balance between efficiency and engineering applicability.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"13 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149172665","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

A Nonlinear Mesoscale Constitutive Model for Cement‐Bridge Damage in Permeable Cement‐Stabilized Aggregate Bases 透水水泥稳定骨料基层水泥桥梁损伤的非线性中尺度本构模型

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-10-13 DOI: 10.1002/nag.70457

Xiaoming Wang, Yuanjie Xiao, Wenbing Shi, Yuliang Chen, Fanwei Meng

{"title":"A Nonlinear Mesoscale Constitutive Model for Cement‐Bridge Damage in Permeable Cement‐Stabilized Aggregate Bases","authors":"Xiaoming Wang, Yuanjie Xiao, Wenbing Shi, Yuliang Chen, Fanwei Meng","doi":"10.1002/nag.70457","DOIUrl":"https://doi.org/10.1002/nag.70457","url":null,"abstract":"Permeable cement‐stabilized aggregate base materials (PCBMs) are widely used in fully permeable pavem structures. However, their nonlinear elastoplastic damage behavior remains insufficiently understood. In this study, we developed a mathematical model to describe the nonlinear elastoplastic damage behavior of cement bridges in PCBMs and modified the damage description function accordingly. The model was then embedded in a discrete element method (DEM) contact model to predict the mechanical and damage behavior of PCBMs under loading. The results show that the proposed method is applicable to PCBMs with cement contents below 20%, with an approximate prediction error of 5.20% for mechanical strength. The damage behavior of PCBMs is closely related to cement content. At low cement content, both tensile and shear damage are extensive. As cement content increases, shear damage becomes less pronounced and macroscopic failure increasingly exhibits tensile damage. Within the calibrated range, the model provides a physics‐based numerical framework for exploring PCBM mechanical response and mesoscopic damage. It also aids in understanding the mesoscopic damage mechanisms of PCBMs and accelerating material optimization.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"5 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149172666","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

Nonlinear Analysis for Extended Pile Shaft Under Combined Vertical and Lateral Loads 竖向和横向联合荷载作用下扩展桩轴的非线性分析

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-10-10 DOI: 10.1002/nag.70454

Lixing Wang, Xiangzhe Xu, M. Hesham El Naggar, Minjie Wen, Yunpeng Zhang, Wenbing Wu

{"title":"Nonlinear Analysis for Extended Pile Shaft Under Combined Vertical and Lateral Loads","authors":"Lixing Wang, Xiangzhe Xu, M. Hesham El Naggar, Minjie Wen, Yunpeng Zhang, Wenbing Wu","doi":"10.1002/nag.70454","DOIUrl":"https://doi.org/10.1002/nag.70454","url":null,"abstract":"The lateral response of partially embedded single piles, referred to as extended pile shafts, subjected to combined vertical and lateral loads is investigated using a novel analytical method that explicitly accounts for the P ‐Δ effect caused by axial pile force and the layering of foundation soils. An iterative load‑transfer method is proposed to determine the axial force profile along the pile, while a modified conical strain wedge (CSW) model is developed to better characterize the nonlinear horizontal pile‑soil interaction. By coupling these two models, a nonlinear finite‑difference decomposition algorithm is established to analyze the bearing performance of the extended pile shaft subjected to combined vertical and lateral loads. The accuracy of the proposed method is validated using two published experimental and numerical cases. The validated model is utilized to perform comprehensive parametric studies to investigate the influences of soil internal friction angle, extended length ratio, and vertical load on pile responses. The results reveal that the soil internal friction angle governs the mobilization depth of soil resistance; the extended length ratio serves as the most critical geometric parameter governing lateral deformation and stability; and vertical load mainly acts as an amplification factor after lateral displacement develops. Overall, the proposed method provides a unified and rational framework for predicting the lateral response of single piles under combined loads, which can offer practical guidance for the design of offshore and geotechnical pile foundations.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"6 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149150635","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

Influence of Grain‐Scale Heterogeneity on Crack Propagation in Crystalline Rocks Based on Phase‐Field Modeling 基于相场模型的晶粒尺度非均匀性对结晶岩石裂纹扩展的影响

IF 4 2区工程技术

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2026-10-10 DOI: 10.1002/nag.70456

Cheng Zhao, Zejun Tian, Jinquan Xing, Fubin Xiang, Jialun Niu, Huiguan Chen

{"title":"Influence of Grain‐Scale Heterogeneity on Crack Propagation in Crystalline Rocks Based on Phase‐Field Modeling","authors":"Cheng Zhao, Zejun Tian, Jinquan Xing, Fubin Xiang, Jialun Niu, Huiguan Chen","doi":"10.1002/nag.70456","DOIUrl":"https://doi.org/10.1002/nag.70456","url":null,"abstract":"The mesoscopic heterogeneity of crystalline rocks, primarily manifested in mineral distribution and content, critically controls crack path selection and macroscopic strength. However, a mechanistic and quantitative understanding of these grain‐scale controls remains limited. To bridge this gap, we conduct mixed‐mode Semi‐Circular Bend (SCB) numerical experiments using the heterogeneous unified phase‐field model developed in our previous work, which can effectively capture crack propagation and the associated mechanical response in heterogeneous rocks, to elucidate the distinct roles of mineral distribution and mineral content. The results demonstrate that mineral distribution primarily controls the crack trajectory by fixing soft‐hard phase positioning and interface topology: cracks preferentially circumvent high strength minerals and propagate along weak interfaces, consistent with the minimum potential energy principle. Meanwhile, mineral content dominantly regulates macroscopic mechanical properties, as the global load‐bearing capacity increases markedly with a higher proportion of hard minerals. Moreover, variations in mineral content inevitably induce different mineral distributions, which fundamentally reshape crack paths. From an energetic perspective, the peak load exhibits a clear positive correlation with the peak effective strain energy; when crack initiation occurs within weak mineral phases, effective strain energy is released prematurely at lower levels, constraining global energy accumulation and consequently reducing macroscopic strength. This work provides a quantitative basis for fracture prediction and stability assessment of heterogeneous rock masses, and promotes the understanding of the fracture mechanism of crystalline rocks.","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"21 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149150633","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

Clay and Sand Model Extended to Unsaturated Conditions: Implementation and Validation Within a Symbolic Algebra–Based Framework 粘土和砂模型扩展到非饱和条件：在基于符号代数的框架内的实现和验证

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: 2026-08-17 DOI: 10.1002/nag.70401

Arianna Pucci, Ignacio Giomi, Giulia Guida, Vicente Navarro, Francesca Casini

{"title":"Clay and Sand Model Extended to Unsaturated Conditions: Implementation and Validation Within a Symbolic Algebra–Based Framework","authors":"Arianna Pucci, Ignacio Giomi, Giulia Guida, Vicente Navarro, Francesca Casini","doi":"10.1002/nag.70401","DOIUrl":"10.1002/nag.70401","url":null,"abstract":"<div>\u0000 \u0000 <p>This study presents a fully coupled hydro-mechanical implementation of the Clay and Sand Model (CASM) extended to partially saturated conditions (U-CASM) within the COMSOL Multiphysics environment. The formulation adopts Bishop's effective stress and suction as stress variables and incorporates alternative loading–collapse surfaces, dilatancy laws, and a porosity-dependent water retention curve. The main contribution lies in a fully customised implementation strategy based on symbolic algebra, which enables user-defined constitutive modelling, simplifies equation integration, and reduces programming effort within a multiphysics framework. The model is verified against benchmark simulations for clays and sands under drained and undrained conditions in both saturated and unsaturated states. Validation against triaxial and oedometer data confirms the ability of the model to reproduce soil behaviour over a wide range of stress paths and suction levels, while highlighting the influence of alternative constitutive assumptions. A field-scale application further demonstrates the capability of the framework to capture key hydro-mechanical features of partially saturated soils, including collapse upon wetting.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"50 16","pages":"5759-5788"},"PeriodicalIF":3.6,"publicationDate":"2026-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148754633","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

Micro-Parameter Sensitivity Analysis and Validation of the Mechanical Behaviour of Soft–Hard Composite Rock Based on 2D-DEM 基于2D - DEM的软-硬复合岩石力学行为微参数敏感性分析与验证

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: 2026-08-20 DOI: 10.1002/nag.70415

Jin-Hua Li, Yan-Long Li, En-Long Liu, Pan Wang, Wen-Xiang Liu, Yang Yang

{"title":"Micro-Parameter Sensitivity Analysis and Validation of the Mechanical Behaviour of Soft–Hard Composite Rock Based on 2D-DEM","authors":"Jin-Hua Li, Yan-Long Li, En-Long Liu, Pan Wang, Wen-Xiang Liu, Yang Yang","doi":"10.1002/nag.70415","DOIUrl":"10.1002/nag.70415","url":null,"abstract":"<div>\u0000 \u0000 <p>Calibration of microparameters in numerical simulations is a critical factor affecting model accuracy. To determine the relationship between macro- and microparameters in composite rock masses and the influence of soft rock layer proportions on mechanical properties, this study employed PFC2D software to construct numerical models of composite rock masses with varying soft-to-hard layer thickness ratios. A systematic analysis was conducted to investigate the influence of microparameters on macro-mechanical properties. For composite rock bodies with varying soft rock layer thicknesses, as the soft rock proportion increases, the failure mode gradually shifts from shear failure dominated by hard rock to foliated failure dominated by soft rock. Cracks propagate along bedding planes and are constrained by hard rock layers. When the soft rock layer thickness increases from 10% to 90%, the total number of cracks increases by approximately twofold, while the proportion of shear cracks decreases from 75% to 40%. The crack counting rate exhibits exponential growth with stress and synchronizes with stress amplitude, peaking at 180–200 times/s<sup>−</sup><sup>1</sup>. Laboratory test results align with numerical simulations, demonstrating that the PFC model accurately predicts composite rock mass strength (error ≤3.7%) and elastic modulus (error ≤4.6%). This study provides theoretical support for correlating macro- and micro-mechanical properties in composite rock masses of varying hardness, offering significant reference value for stability assessment and reinforcement design in underground engineering.</p>\u0000 </div>","PeriodicalId":13786,"journal":{"name":"International Journal for Numerical and Analytical Methods in Geomechanics","volume":"50 16","pages":"5847-5867"},"PeriodicalIF":3.6,"publicationDate":"2026-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148768445","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