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Field investigation and full-scale model testing of mud pumping and its effect on the dynamic properties of the slab track–subgrade interface

Huang, J. and Su, Q. and Wang, W. and Phong, P.D. and Liu, K. (2019) Field investigation and full-scale model testing of mud pumping and its effect on the dynamic properties of the slab track–subgrade interface. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 233 (8). pp. 802-816. ISSN 9544097

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Abstract

Passenger comfort and safety are the most important aspects in the operation of high-speed railways. Mud pumping is a typical problem that occurs in the slab track and the subgrade interface, which influences passenger comfort and safety. In this paper, various field investigations and a full-scale model of the slab track and the subgrade are presented. The external and internal characteristics of mud pumping in the slab track–subgrade interface and the influence of mud pumping on the dynamic properties of the slab track–subgrade are analyzed. The results show that mud pumping only occurs at the expansion joints in the concrete base of the slab track structure. This happens due to the infiltration of rainwater into the subgrade bed through the cracks in the expansion joints. When the upper layer of the subgrade is kept saturated in the full-scale model, mud pumping is found to occur after 3.0 × 104 loading cycles. The vibration ratio of the subgrade surface to the concrete base gradually increases with continued cyclic loading. In addition, the cumulative settlement of the subgrade increased continuously. After 2.0 × 106 loading cycles, it was found that a large volume of slurry composed of water and fine particles was squeezed out of the subgrade bed, and mud pumping occurred on the surface of the subgrade bed leading to the formation of a mud layer between the concrete base and the subgrade bed, causing a loss of contact between the subgrade bed and the concrete base. This reduces the ability of the subgrade bed to support the slab track structure. © IMechE 2018.

Item Type: Article
Divisions: Institutes > Institute of Techniques for Special Engineering
Identification Number: 10.1177/0954409718810262
Uncontrolled Keywords: Beams and girders; Concretes; Expansion; Expansion joints; Pumps; Railroad plant and structures; Railroads; Dynamic property; Field investigation; Full-scale modeling; High - speed railways; Mud-pumping; Slab tracks; Subgrade bed; Railroad transportation
Additional Information: Language of original document: English.
URI: http://eprints.lqdtu.edu.vn/id/eprint/9276

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