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Discrete element modelling of railway ballast performance considering particle shape and rolling resistance

查看全文 作　　者：Yunlong [1]Guo;Chunfa [2]Zhao;Valeri [1]Markine;Can [2]Shi;Guoqing [3]Jing;Wanming [2]Zhai 高影响力作者 机构地区：[1]Faculty of Civil Engineering and Geosciences,Delft University of Technology,2628CN Delft,The Netherlands;[2]Train and Track Research Institute,State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China;[3]School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China高影响力机构 出　　处：《Railway Engineering Science》索引2020年第28卷第4期,共26页高影响力期刊 基　　金：by the China Scholarship Council and the Natural Science Foundation of China(Grant No.51578469);We also would like to acknowledge the support of the Chinese Program of Introducing Talents of Discipline to Universities(111 Project,Grant No.B16041)。 摘　　要：To simulate ballast performance accurately and efficiently,the input in discrete element models should be carefully selected,including the contact model and applied particle shape.To study the effects of the contact model and applied particle shape on the ballast performance(shear strength and deformation),the direct shear test(DST)model and the large-scale process simulation test(LPST)model were developed on the basis of two types of contact models,namely the rolling resistance linear(RRL)model and the linear contact(LC)model.Particle shapes are differentiated by clumps.A clump is a sphere assembly for one ballast particle.The results show that compared with the typical LC model,the RRL method is more efficient and realistic to predict shear strength results of ballast assemblies in DSTs.In addition,the RRL contact model can also provide accurate vertical and lateral ballast deformation under the cyclic loading in LPSTs. 关 键 词：Discrete element method Ballast performance Boundary condition Rolling resistance Direct shear test Lateral displacement
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