Discrete element analyses of stiffness distribution of gap-graded soils with particle property disparity  

作　　者：Deyun Liu Mengting Wang Ci Wang 

机构地区：[1]Department of Civil&Environmental Engineering,The Hong Kong University of Science and Technology Clear Water Bay,Hong Kong,China [2]The Bartlett School of Sustainable Construction,Queen Elizabeth Olympic Park,14 East Bay Lane,UK [3]Key Laboratory of In-fiber Integrated Optics,Ministry Education of China,Harbin Engineering University,Harbin,150001,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2025年第4期2603-2618,共16页岩石力学与岩土工程学报(英文)

基　　金：Financial supports from the PolyU Distinguished Postdoctoral Fellowship Scheme are highly appreciated;supported by the National Natural Science Foundation of China (Grant No.52201008);the Fundamental Research Funds for the Central Universities,the State Key Laboratory of Particle Detection and Electronics (Grant No.SKLPDE-KF-202311).

摘　　要：Utilizing the Discrete Element Method,this research studied the stiffness distribution of gap-graded soils by modifying the conventional static method.By acknowledging the inherent particle property disparity between coarser and finer particles,this research differentiates the stiffness distribution of gap-graded soils from the perspective of contact and particle types.Results indicate that particle property disparity significantly influence the small-strain stiffness characteristics,consequently altering the overall stiffness distribution in gap-graded soil specimens.Specifically,with the equivalent coarser particle property,an increase in particle Young's modulus of finer particles results in an augmentation of small-strain stiffness values,alongside an increased stiffness distribution contribution from finer particles.Nevertheless,this study reveals that even with a higher particle Young's modulus of finer particles,the proportion of small-strain stiffness transferred by finer particles remains consistently lower than their volume fraction.Furthermore,the proportion of stiffness transferred by finer particles may fall below their contribution to stress transmission.This investigation accentuates the subtle yet significant effects of particle property variations on small strain stiffness and its subsequent distribution,providing a foundation for advancing the significance of particle property disparities in evaluating soil responses.

关 键 词：Discrete element method Particle property disparity Gap-graded soils Stiffness distribution Small-strain stiffness 

分 类 号：TU43[建筑科学—岩土工程]