Article(id=1243220378999436010, tenantId=1146029695717560320, journalId=1242844143416819734, issueId=1243220377556595432, articleNumber=null, orderNo=null, doi=10.15959/j.cnki.0254-0053.2025.03.007, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1746892800000, receivedDateStr=2025-05-11, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1774336436271, onlineDateStr=2026-03-24, pubDate=1758729600000, pubDateStr=2025-09-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1774336436271, onlineIssueDateStr=2026-03-24, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1774336436271, creator=13701087609, updateTime=1774336436271, updator=13701087609, issue=Issue{id=1243220377556595432, tenantId=1146029695717560320, journalId=1242844143416819734, year='2025', volume='46', issue='3', pageStart='541', pageEnd='810', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1774336435926, creator=13701087609, updateTime=1774336648182, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1243221267898282005, tenantId=1146029695717560320, journalId=1242844143416819734, issueId=1243220377556595432, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1243221267898282006, tenantId=1146029695717560320, journalId=1242844143416819734, issueId=1243220377556595432, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=649, endPage=661, ext={EN=ArticleExt(id=1243220379209151214, articleId=1243220378999436010, tenantId=1146029695717560320, journalId=1242844143416819734, language=EN, title=Modelling of Multi-Scale Mechanical Behaviours and Pore Fractal Characterization of Granular Materials, columnId=null, journalTitle=Chinese Quarterly of Mechanics, columnName=null, runingTitle=null, highlight=null, articleAbstract=
The mechanical response of geotechnical granular materials exhibits multi-scale characteristics. The multi-scale simulations coupling the Finite Element Method (FEM) and Discrete Element Method (DEM) can effectively capture the multi-scale responses while maintaining high computational efficiency. A GPU-parallel FEM-DEM coupling code was developed based on the high-performance DEM software MatDEM, with computational parameters and results analyzed in conjunction with granular pore fractal characteristics. Firstly, multi-fractal theory was employed to investigate the spatial distribution characteristics of pores, identifying key fractal indices. Subsequently, the reliability of the FEM-DEM coupling code was verified through single element tests and biaxial compression tests. Finally, the meso-scopic responses of Representative Volume Elements (RVEs) at different locations were investigated based on biaxial compression tests. Results demonstrate that the pore spatial distribution within RVE exhibits multi-fractal characteristics. When the particle quantity exceeds 400, the self-similarity of pore spatial distribution ensures the stability of stress-strain responses output after homogenization of granular assemblies within RVE. The capacity dimension D0 and singularity index α0, which characterize the average information of pore distribution, show linear correlations with RVE volumetric strain. These indices can serve as internal variables reflecting the complexity of granular material spatial characteristics. This study provides an exploration for analyzing the macro-meso mechanical relationships in engineering-scale granular deposits.
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岩土颗粒材料的力学响应呈现多尺度特性,开展有限元法(Finite Element Method,FEM)和离散元法(Discrete Element Method,DEM)耦合的多尺度模拟可在反映多尺度响应的同时兼顾计算效率.为此,基于国产高性能离散元软件MatDEM开发了GPU并行FEM-DEM耦合计算程序,并结合颗粒孔隙分形特征对计算参数和结果进行分析.首先,采用多重分形理论研究了颗粒孔隙空间分布特征,确定了关键分形指标.其次,通过单元和双轴压缩试验验证了FEM-DEM耦合程序的可靠性.最后,基于双轴压缩试验研究了不同位置处表征元(Representative Volume Element,RVE)的细观响应.结果表明,RVE内孔隙空间分布具有多重分形特征,当颗粒数量超过400时,孔隙空间分布的自相似性确保了RVE内颗粒集合均匀化后输出应力-应变响应的稳定性.容量维数D0和奇异指数α0由于表征孔隙分布的平均信息而与RVE体应变具有线性相关性,可作为反映颗粒材料空间特征复杂性的简洁内变量.研究结果为分析工程尺度颗粒堆积体的宏-细观力学联系提供了一种方法探索.
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仵仲阳,博士生.研究方向:岩土颗粒材料的多尺度模拟.E-mail:wuzy@tongji.edu.cn
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Schematic illustration of the FEM-DEM multi-scale method, figureFileSmall=3XqZOvr12ZaTP184V/jXiQ==, figureFileBig=JbK7q25qvcyfWEvI9lbZlQ==, tableContent=null), ArticleFig(id=1243220393675305011, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=CN, label=图1, caption=
FEM-DEM耦合多尺度方法示意图, figureFileSmall=3XqZOvr12ZaTP184V/jXiQ==, figureFileBig=JbK7q25qvcyfWEvI9lbZlQ==, tableContent=null), ArticleFig(id=1243220394115706952, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=EN, label=Fig.2, caption=
Schematic illustration of multi-fractal analysis for RVE pores, figureFileSmall=xFgYdR95E9/zmuj/D8LfVA==, figureFileBig=IctDs3qVOJjqO/ApMAXMHg==, tableContent=null), ArticleFig(id=1243220394207981646, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=CN, label=图2, caption=
RVE内孔隙空间分布的多重分形分析示意图, figureFileSmall=xFgYdR95E9/zmuj/D8LfVA==, figureFileBig=IctDs3qVOJjqO/ApMAXMHg==, tableContent=null), ArticleFig(id=1243220394379948117, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=EN, label=Fig.3, caption=
Multi-fractal spectrum for various RVE, figureFileSmall=MIXn81nYrr3WW2C+cRamzQ==, figureFileBig=zwSxdtjyGtsS9Kjie7B+ZA==, tableContent=null), ArticleFig(id=1243220394677743710, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=CN, label=图3, caption=
不同颗粒数量RVE的多重分形谱, figureFileSmall=MIXn81nYrr3WW2C+cRamzQ==, figureFileBig=zwSxdtjyGtsS9Kjie7B+ZA==, tableContent=null), ArticleFig(id=1243220394862293096, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=EN, label=Fig.4, caption=
α0/D0 values for various RVE, figureFileSmall=iIpTF3JtY4Luu/ZPXJbjvg==, figureFileBig=klO52fp4sQcdBexFU2er2g==, tableContent=null), ArticleFig(id=1243220395017482350, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=CN, label=图4, caption=
不同颗粒数量RVE的α0/D0值, figureFileSmall=iIpTF3JtY4Luu/ZPXJbjvg==, figureFileBig=klO52fp4sQcdBexFU2er2g==, tableContent=null), ArticleFig(id=1243220395235586165, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=EN, label=Fig.5, caption=
Stress-strain behavior for various RVE, figureFileSmall=2Ny7Q/z0ub0kFaUFBVtc2w==, figureFileBig=iZ+db1S0oHAHekLOI4X3HQ==, tableContent=null), ArticleFig(id=1243220396296745085, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=CN, label=图5, caption=
不同颗粒数量RVE的应力-应变响应, figureFileSmall=2Ny7Q/z0ub0kFaUFBVtc2w==, figureFileBig=iZ+db1S0oHAHekLOI4X3HQ==, tableContent=null), ArticleFig(id=1243220396787478662, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=EN, label=Fig.6, caption=
Loading test of single element, figureFileSmall=QBwSwy8K2GfQnVqba9ELsg==, figureFileBig=of+Xx9j4K2k88oz9AH8g5w==, tableContent=null), ArticleFig(id=1243220397068497040, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=CN, label=图6, caption=
单元压缩试验, figureFileSmall=QBwSwy8K2GfQnVqba9ELsg==, figureFileBig=of+Xx9j4K2k88oz9AH8g5w==, tableContent=null), ArticleFig(id=1243220397211103385, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=EN, label=Fig.7, caption=
Biaxial compression test, figureFileSmall=xebwnB0x6v1kAy11RtkPcA==, figureFileBig=p0mO4FIuxE/jrNY1THftnQ==, tableContent=null), ArticleFig(id=1243220397605367968, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=CN, label=图7, caption=
双轴压缩试验, figureFileSmall=xebwnB0x6v1kAy11RtkPcA==, figureFileBig=p0mO4FIuxE/jrNY1THftnQ==, tableContent=null), ArticleFig(id=1243220397915746469, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=EN, label=Fig.8, caption=
Specimen macroscopic deformation behavior at 2% axial strain, figureFileSmall=4rvbPn6L4BHXEcRGA+tAGg==, figureFileBig=JPIeCrLzhOps5Nq6nTZhFA==, tableContent=null), ArticleFig(id=1243220398033186988, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=CN, label=图8, caption=
2%轴向应变时的试样宏观变形行为, figureFileSmall=4rvbPn6L4BHXEcRGA+tAGg==, figureFileBig=JPIeCrLzhOps5Nq6nTZhFA==, tableContent=null), ArticleFig(id=1243220398184181938, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=EN, label=Fig.9, caption=
Evolution of meso-scale characterization for various RVE, figureFileSmall=n0RPNWhwYzmwWnCQJ9NJmQ==, figureFileBig=lnrO2C6Ne+KGrv+ziaoT+g==, tableContent=null), ArticleFig(id=1243220398419062966, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=CN, label=图9, caption=
不同位置RVE在加载过程中的细观特征演化规律, figureFileSmall=n0RPNWhwYzmwWnCQJ9NJmQ==, figureFileBig=lnrO2C6Ne+KGrv+ziaoT+g==, tableContent=null), ArticleFig(id=1243220398523920574, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=EN, label=Fig.10, caption=
Relationship of fractal dimension and volumetric strain for various RVE, figureFileSmall=SSuxzLkrohgKULtEoYlQGQ==, figureFileBig=F+BuUz3frL5cdf2Z9LjPJA==, tableContent=null), ArticleFig(id=1243220398838493381, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=CN, label=图10, caption=
不同位置RVE在加载过程中分维数与体应变的关系, figureFileSmall=SSuxzLkrohgKULtEoYlQGQ==, figureFileBig=F+BuUz3frL5cdf2Z9LjPJA==, tableContent=null), ArticleFig(id=1243220398985294027, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=EN, label=Fig.11, caption=
Relationship between the number of RVE and acceleration factor, figureFileSmall=VxfkGdH9vTjkEuq8jkc4Jw==, figureFileBig=/lhyPTNvxuZl02Nemz6bvA==, tableContent=null), ArticleFig(id=1243220399060791506, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=CN, label=图11, caption=
RVE数量与加速系数关系, figureFileSmall=VxfkGdH9vTjkEuq8jkc4Jw==, figureFileBig=/lhyPTNvxuZl02Nemz6bvA==, tableContent=null), ArticleFig(id=1243220399169843416, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=EN, label=Tab.1, caption=
Parameters for the RVE particles
, figureFileSmall=null, figureFileBig=null, tableContent=
| Parameter | Value |
|---|
| Particle radii r/mm | 3~7 |
| Normal stiffnesses kn/(N/m) | 3×106 |
| Tangential stiffnesses kt/(N/m) | 2.4×106 |
| Particle density ρ/(kg/m3) | 2 650 |
| Friction angle φ/rad | 0.5 |
), ArticleFig(id=1243220399505387742, tenantId=1146029695717560320, journalId=1242844143416819734, articleId=1243220378999436010, language=CN, label=表1, caption=
RVE内颗粒细观参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| Parameter | Value |
|---|
| Particle radii r/mm | 3~7 |
| Normal stiffnesses kn/(N/m) | 3×106 |
| Tangential stiffnesses kt/(N/m) | 2.4×106 |
| Particle density ρ/(kg/m3) | 2 650 |
| Friction angle φ/rad | 0.5 |
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