Macro and meso dynamic response of granular materials in ballastless track subgrade for high-speed railway

Considering the discrete and stochastic properties of granular materials, a two-dimensional numerical model was established to study the dynamic behavior of high-speed railway (HSR) ballastless track subgrade by using finite difference-discrete element (FDM-DEM) coupling method. Combined with on-sit...

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Autores principales:	Junhua Xiao, Siqi Sun, Xiao Zhang, De Zhang, Kai Wei, Yanhai Wang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	High speed railway (HSR) Ballastless track subgrade Granular material FDM-DEM coupling method Macro and meso analysis Transportation engineering TA1001-1280
Acceso en línea:	https://doaj.org/article/3ba6e27bb8424f4dba0f6e2c4e0e0bc1
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id	oai:doaj.org-article:3ba6e27bb8424f4dba0f6e2c4e0e0bc1
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spelling	oai:doaj.org-article:3ba6e27bb8424f4dba0f6e2c4e0e0bc12021-11-30T04:15:27ZMacro and meso dynamic response of granular materials in ballastless track subgrade for high-speed railway2046-043010.1016/j.ijtst.2020.09.001https://doaj.org/article/3ba6e27bb8424f4dba0f6e2c4e0e0bc12021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2046043020300617https://doaj.org/toc/2046-0430Considering the discrete and stochastic properties of granular materials, a two-dimensional numerical model was established to study the dynamic behavior of high-speed railway (HSR) ballastless track subgrade by using finite difference-discrete element (FDM-DEM) coupling method. Combined with on-site vibration test results in macroscopic scale, the mesoscopic vibration response of subgrade granular materials was analyzed under different speed levels. Some unusual phenomena were observed as follow: 1). In the surface layer (i.e., the top area of the subgrade, thickness = 0.4 m), particles showed a very wide response band in the frequency domain (up to 130 Hz), even beyond the maximum frequency of train loading (60 Hz). It was found that some particles in the surface layer produced not only forced vibration, but also local random vibration. However, the bottom layer particles (i.e., the area under the surface layer, thickness = 2.3 m) were only active within 40 Hz. 2) Force chains in the granular aggregate were disappeared and rebuilt synchronously in the dynamic loading process. A typical mode of force chain weakening was described in meso scale. 3) Particles at interface region between the surface and bottom layer exhibited severe local vibration amplification when the train speed level was higher than 300 km/h.Junhua XiaoSiqi SunXiao ZhangDe ZhangKai WeiYanhai WangElsevierarticleHigh speed railway (HSR)Ballastless track subgradeGranular materialFDM-DEM coupling methodMacro and meso analysisTransportation engineeringTA1001-1280ENInternational Journal of Transportation Science and Technology, Vol 10, Iss 4, Pp 313-328 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	High speed railway (HSR) Ballastless track subgrade Granular material FDM-DEM coupling method Macro and meso analysis Transportation engineering TA1001-1280
spellingShingle	High speed railway (HSR) Ballastless track subgrade Granular material FDM-DEM coupling method Macro and meso analysis Transportation engineering TA1001-1280 Junhua Xiao Siqi Sun Xiao Zhang De Zhang Kai Wei Yanhai Wang Macro and meso dynamic response of granular materials in ballastless track subgrade for high-speed railway
description	Considering the discrete and stochastic properties of granular materials, a two-dimensional numerical model was established to study the dynamic behavior of high-speed railway (HSR) ballastless track subgrade by using finite difference-discrete element (FDM-DEM) coupling method. Combined with on-site vibration test results in macroscopic scale, the mesoscopic vibration response of subgrade granular materials was analyzed under different speed levels. Some unusual phenomena were observed as follow: 1). In the surface layer (i.e., the top area of the subgrade, thickness = 0.4 m), particles showed a very wide response band in the frequency domain (up to 130 Hz), even beyond the maximum frequency of train loading (60 Hz). It was found that some particles in the surface layer produced not only forced vibration, but also local random vibration. However, the bottom layer particles (i.e., the area under the surface layer, thickness = 2.3 m) were only active within 40 Hz. 2) Force chains in the granular aggregate were disappeared and rebuilt synchronously in the dynamic loading process. A typical mode of force chain weakening was described in meso scale. 3) Particles at interface region between the surface and bottom layer exhibited severe local vibration amplification when the train speed level was higher than 300 km/h.
format	article
author	Junhua Xiao Siqi Sun Xiao Zhang De Zhang Kai Wei Yanhai Wang
author_facet	Junhua Xiao Siqi Sun Xiao Zhang De Zhang Kai Wei Yanhai Wang
author_sort	Junhua Xiao
title	Macro and meso dynamic response of granular materials in ballastless track subgrade for high-speed railway
title_short	Macro and meso dynamic response of granular materials in ballastless track subgrade for high-speed railway
title_full	Macro and meso dynamic response of granular materials in ballastless track subgrade for high-speed railway
title_fullStr	Macro and meso dynamic response of granular materials in ballastless track subgrade for high-speed railway
title_full_unstemmed	Macro and meso dynamic response of granular materials in ballastless track subgrade for high-speed railway
title_sort	macro and meso dynamic response of granular materials in ballastless track subgrade for high-speed railway
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/3ba6e27bb8424f4dba0f6e2c4e0e0bc1
work_keys_str_mv	AT junhuaxiao macroandmesodynamicresponseofgranularmaterialsinballastlesstracksubgradeforhighspeedrailway AT siqisun macroandmesodynamicresponseofgranularmaterialsinballastlesstracksubgradeforhighspeedrailway AT xiaozhang macroandmesodynamicresponseofgranularmaterialsinballastlesstracksubgradeforhighspeedrailway AT dezhang macroandmesodynamicresponseofgranularmaterialsinballastlesstracksubgradeforhighspeedrailway AT kaiwei macroandmesodynamicresponseofgranularmaterialsinballastlesstracksubgradeforhighspeedrailway AT yanhaiwang macroandmesodynamicresponseofgranularmaterialsinballastlesstracksubgradeforhighspeedrailway
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Macro and meso dynamic response of granular materials in ballastless track subgrade for high-speed railway

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