Experimental study on mud pumping mechanism and dynamic characteristics of ballasted track subgrade under intermittent load-wetting coupling
HAN Bowen1，2，3，CAI Guoqing4，5，SU Yanlin4，5，SHAN Yepeng4，5，LI Jian4，5
(1. School of Traffic and Transportation，Shijiazhuang Tiedao University，Shijiazhuang，Hebei 050043，China；2. Key Laboratory of Traffic Safety and Control of Hebei Province，Shijiazhuang Tiedao University，Shijiazhuang，Hebei 050043，China；3. State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures，Shijiazhuang Tiedao University，Shijiazhuang，Hebei 050043，China；4. Key Laboratory of Urban Underground Engineering of Ministry of Education，Beijing Jiaotong University，Beijing 100044，China；5. School of Civil Engineering，Beijing Jiaotong University，Beijing 100044，China)
Abstract：The mud pumping mechanism and dynamic characteristics of ballasted track subgrade under intermittent train load and rainfall wetting coupling are still unclear. A mud pumping model test in ballasted track subgrade under intermittent load-wetting coupling was conducted. The experimental results indicate that the cyclic loading has a promoting effect on the increase of volumetric water content and pore water pressure，and the promoting effect weakens with the increase of dry density. The accumulated deformation and particle migration mainly occur in the LS1-LS3 stages，and the changes are most significant in the LS2 stage because of the high saturation and low density of the soils. In the subsequent loading stages，only a small amount of accumulated deformation occurs due to the high density of the soils，and the phenomenon of particle migration is not obvious. A small resilience occurs during the intermittent period(IS4-IS7 stage). At the end of the experiment，the ballast void contaminant index(VCI) is 27%，which is close to the critical value of 40% for railway maintenance and needs to pay attention.
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