辽宁工程技术大学学报（自然科学版）2026，Vol.45Issue(1)：42-51,10.DOI:10.11956/j.issn.1008-0562.20250297
道路用煤矸石路基残余剪切特性与细观行为
Residual shear characteristics and microscopic behavior of coal gangue subgrade for road use
摘要
Abstract
To explore the influence of water content and particle gradation on the evolution of residual shear strength characteristics of coal gangue subgrade fill and reveal the underlying mechanisms,this study employed drained repeated direct shear tests to evaluate the mechanical responses of coal gangue under varying conditions.Additionally,discrete element numerical simulations were conducted to analyze,from a mesoscopic perspective,the evolution characteristics of particle displacement fields and contact force chain networks during shearing.The results indicate that the shear stress-displacement curves of coal gangue exhibit strain-hardening behavior,which can be well fitted by a hyperbolic model.The residual shear strength decreases significantly with increasing water content,accompanied by a reduction in interparticle friction and interlocking effects.This trend is more pronounced in samples with higher fractal dimensions(well-graded).At the mesoscopic level,specimens with lower fractal dimensions are dominated by a coarse-particle skeleton with highly concentrated force chains,whereas those with higher fractal dimensions show enhanced fine-particle filling,leading to a more uniform distribution of contacts and reduced shear stability.This study elucidates the macro-mesoscopic coupling mechanisms and provides an important theoretical basis for material design and long-term stability prediction of coal gangue subgrades.关键词
路基工程/煤矸石/残余强度/颗粒级配/力学机制/分形维数/嵌锁效应Key words
roadbed engineering/coal gangue/residual strength/particle size distribution/mechanical mechanism/fractal dimension/interlocking effect分类
交通工程引用本文复制引用
张诜,郭聚坤,惠迎新,闫升,潘明江..道路用煤矸石路基残余剪切特性与细观行为[J].辽宁工程技术大学学报（自然科学版）,2026,45(1):42-51,10.基金项目
丝绸之路经济带创新驱动发展试验区、乌昌石国家自主创新示范区科技发展计划项目(2023LQ03002) （2023LQ03002）
宁夏回族自治区交通运输厅科技项目(202300196) （202300196）
潍坊市科技发展计划项目(2024GX067) （2024GX067）
