期刊
INTERNATIONAL JOURNAL OF RAIL TRANSPORTATION
卷 10, 期 2, 页码 230-256出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/23248378.2021.1899858
关键词
Subgrade mud pumping; ballastless track; full-scale model; excess pore water pressure; driving factors
资金
- Innovation Project of Central South University [2018zzts192]
- National Natural Science Foundation of China [51878666, 51978672]
This paper investigates the mechanisms and driving factors of subgrade mud pumping for ballastless track in high-speed railway through a full-scale model test system. It is found that the subgrade surface layer under the cracked concrete base is prone to mud pumping under rainwater infiltration conditions, and an increase in excess pore water pressure mobilizes the mud pumping. Therefore, prevention and treatment strategies can focus on preventing rainwater infiltration or implementing more efficient drainage systems.
This paper aims to clarify the mechanisms and driving factors of subgrade mud pumping for ballastless track in high-speed railway. A full-scale model test system in which the train dynamic loading and rainfall condition could be simulated was developed, allowing the recurrence of subgrade mud pumping. The relationship between the degree of mud pumping and the hydrodynamic pressure characteristics of subgrade was investigated, and the mechanisms and driving factors of mud pumping were also clarified. It was shown that the subgrade surface layer under the cracked concrete base was always saturated under the condition of rainwater infiltration, and it was prone to mud pumping given a long-term action of the dynamic loading of trains. A significant increase in excess pore water pressure to a certain extent mobilized the mud pumping. Accordingly, the prevention and treatment of mud pumping can be the prevention of rainwater infiltration or more efficient drainage.
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