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DOI	10.1016/j.conbuildmat.2020.121778
	Investigation of the deformation and strength properties of fouled graded macadam materials in heavy-haul railway subgrade beds
	Yang, Zhihao; Yue, Zurun; Tai, Bowen
通讯作者	Yue, ZR (通讯作者)，Shijiazhuang Tiedao Univ, State Key Lab Mech Behav & Syst Safety Traff Engn, Shijiazhuang 050043, Hebei, Peoples R China.
发表日期	2021
ISSN	0950-0618
EISSN	1879-0526
卷号	273
英文摘要	Over the course of long-term operation, the graded macadam materials used in heavy-haul railway subgrade bed surfaces become polluted to different degrees. This fouling is due to its own breakage, the intrusion of external coal debris, sand blasting, dust, and other foreign materials that accumulate on the ballast along with rainwater seepage, and the internal-structure mud-pumping. This study had the goal of determining the variation law for the deformation and strength characteristics of fouled graded macadam materials under cyclic loading. First, graded macadam materials with different fine particle contents were prepared, and a series of dynamic triaxial tests were carried out using a GCTS largescale cyclic triaxial test system. These initial tests were conducted to determine the mechanism for the coupled effect of the fine particle content, confining pressure, and dynamic stress amplitude on a specimen's accumulative plastic strain under cyclic loading. Using the plastic stability theory as a guideline, the dynamic deformation behaviours of specimens under different stress levels were determined, and a critical dynamic stress calculation model for specimens in the plastic creep state was established by considering the parameters of the confining pressure and fine particle content. Then, an accumulative plastic strain prediction model was established for specimens in the plastic creep state considering the stress level and fine particle content parameters, and a hardening index calculation model under cyclic loading was also established. At the same time, the physical significance of each parameter was clarified. Finally, a dynamic stress-strain relationship calculation model for fouled, graded macadam materials, which took into account the stiffness hardening under cyclic loading and stiffness degradation after fine particle intrusion, was constructed on the basis of a modified version of Iwan's series-parallel model. The research results provide a reference for evaluating the health of existing heavy-haul railway subgrades and will be useful for designing new subgrade structures that take into account the comprehensive control principle of strength and deformation. (C) 2020 Elsevier Ltd. All rights reserved.
英文关键词	Heavy-haul railway subgrade bed; Fouled graded macadam materials; Critical dynamic stress; Accumulative plastic strain; Dynamic stress-strain relationship
语种	英语
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
WOS类目	Construction & Building Technology ; Engineering, Civil ; Materials Science, Multidisciplinary
WOS记录号	WOS:000614160800087
来源期刊	CONSTRUCTION AND BUILDING MATERIALS
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254701
作者单位	[Yang, Zhihao] Shijiazhuang Tiedao Univ, Sch Civil Engn, Shijiazhuang 050043, Hebei, Peoples R China; [Yue, Zurun] Shijiazhuang Tiedao Univ, State Key Lab Mech Behav & Syst Safety Traff Engn, Shijiazhuang 050043, Hebei, Peoples R China; [Tai, Bowen] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Yang, Zhihao,Yue, Zurun,Tai, Bowen. Investigation of the deformation and strength properties of fouled graded macadam materials in heavy-haul railway subgrade beds[J]. 中国科学院西北生态环境资源研究院,2021,273.
APA	Yang, Zhihao,Yue, Zurun,&Tai, Bowen.(2021).Investigation of the deformation and strength properties of fouled graded macadam materials in heavy-haul railway subgrade beds.CONSTRUCTION AND BUILDING MATERIALS,273.
MLA	Yang, Zhihao,et al."Investigation of the deformation and strength properties of fouled graded macadam materials in heavy-haul railway subgrade beds".CONSTRUCTION AND BUILDING MATERIALS 273(2021).