Study on Deformation Characteristics of Crushed Aggregate Subjected to Cyclic Loading Based on Discrete Element Method

被引：0
|
作者：
Wang P. [1 ]
Liu J. [2 ]
Ye Y. [1 ]
Zhang Q. [1 ]
机构：
[1] Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing
[2] School of Civil Engineering, Sun Yat-sen University, Guangzhou
来源：
Tiedao Xuebao/Journal of the China Railway Society | 2020年 / 42卷 / 11期
关键词：
Crushed aggregate; Discrete element method; Effective void ratio; Permanent deformation; Resilient deformation;
D O I：
10.3969/j.issn.1001-8360.2020.11.022
中图分类号：
学科分类号：
摘要：
Based on the large scale indoor dynamic triaxial shear experiments and Particle Flow Code calculation, the permanent and resilient deformation behaviors of crushed aggregate under dynamic loading were analyzed respectively. The effects of amplitude and frequency of dynamic loading as well as the porosity state of the aggregate on dynamic deformation characteristics were also investigated. The effective void ratio was proposed to evaluate the void state of gap-graded crushed aggregate. The results show that both the permanent deformation and resilient deformation increase rapidly in the initial stage of the dynamic loading and then gradually to a constant state; The permanent deformation of aggregate increases with the increase of both amplitude and frequency of the dynamic load. The final constant resilient modulus of crushed aggregate is only determined by the stress state and the effective void ratio can be utilized to evaluate the void state of gap-graded aggregate. With the increase of effective void ratio, the greater the plastic deformation and the smaller the resilient modulus. © 2020, Department of Journal of the China Railway Society. All right reserved.
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页码：161 / 166
页数：5
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