干旱区生态环境知识资源中心(Arid): Experimental study and discrete element analysis of ballast bed with various sand content

Arid

DOI	10.1016/j.conbuildmat.2020.121869
	Experimental study and discrete element analysis of ballast bed with various sand content
	Xiao, Hong; Zhang, Zhihai; Cui, Xuhao; Jin, Feng
通讯作者	Xiao, H (corresponding author), Beijing Jiaotong Univ, Beijing Key Lab Track Engn, Beijing 100044, Peoples R China.
来源期刊	CONSTRUCTION AND BUILDING MATERIALS
ISSN	0950-0618
EISSN	1879-0526
出版年	2021
卷号	271
英文摘要	The railway in the desert region has to face sand hazards. It is of great significance to study the influence of sand on the service quality of railway, to understand the effect of sand on the mechanical characteristics of track structure, and to provide a guide for the maintenance work. At present, the laboratory tests and finite element simulation models are mainly used for the research on sandy railways, while there are few field tests and theoretical analysis methods. In this paper, a discrete element model considering sand, sleepers, ballast bed, and surface layer of subgrade is developed for this purpose. The sand is generated using a new method named the Adjacent grid filling method. The model has an advantage in modelling the mesoscopic contact characteristics between (irregular shape) sand particles and ballast particles. The model is validated against the laboratory test of sand repose angle and the field test of sleeper displacement have conducted. Using the model, the influence of sand content on the mesoscopic contact characteristics and energy evolution of the ballast bed is analyzed. The results show that irregular sand particles with various roundness can better simulate the occlusive effect between sand particles. The higher the sand content, the stronger anisotropy can be seen in the contact number distribution and the influence of sand content is more significant on the tangential contact number distribution than that on the normal contract number distribution. With the increase of sand content, the vertical stress and transverse stress of ballast bed increase at first and then decrease slowly, wherein the 30% sand content is the critical point for the change. The kinetic energy, contact friction energy, and contact damping energy of particles in the ballast bed decrease and then increase slowly with the increase of sand content, while the elastic strain energy in the ballast bed decreases gradually. The results show that when the sand content in the ballast bed is 30% or above, the maintenance is recommended to be conducted a timely manner. (C) 2020 Elsevier Ltd. All rights reserved.
英文关键词	Ballast bed Repose angle test Discrete element method Contact force Stress level Energy evolution
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000608038400120
WOS关键词	DYNAMIC-BEHAVIOR ; TRACK ; CONTAMINATION ; VIBRATION ; TESTS
WOS类目	Construction & Building Technology ; Engineering, Civil ; Materials Science, Multidisciplinary
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/347800
作者单位	[Xiao, Hong; Zhang, Zhihai; Cui, Xuhao; Jin, Feng] Beijing Jiaotong Univ, Beijing Key Lab Track Engn, Beijing 100044, Peoples R China; [Xiao, Hong; Zhang, Zhihai; Cui, Xuhao; Jin, Feng] Beijing Jiaotong Univ, Sch Civil Engn, Beijing 100044, Peoples R China
推荐引用方式 GB/T 7714	Xiao, Hong,Zhang, Zhihai,Cui, Xuhao,et al. Experimental study and discrete element analysis of ballast bed with various sand content[J],2021,271.
APA	Xiao, Hong,Zhang, Zhihai,Cui, Xuhao,&Jin, Feng.(2021).Experimental study and discrete element analysis of ballast bed with various sand content.CONSTRUCTION AND BUILDING MATERIALS,271.
MLA	Xiao, Hong,et al."Experimental study and discrete element analysis of ballast bed with various sand content".CONSTRUCTION AND BUILDING MATERIALS 271(2021).