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| Study on mud pumping particles migration and dynamic characteristics of ballasted track subgrades under multi-stage/multi-frequency train loading-wetting coupling |
| HAN Bowen1，2，3，CAI Guoqing4，5，LUO Yujie4，5，ZHANG Guoguang6，SHAN Yepeng4，5 |
(1. School of Traffic and Transportation，Shijiazhuang Tiedao University，Shijiazhuang，Hebei 050043，China；2. Hebei Key Laboratory of Traffic Safety and Control，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；6. China Railway Jinan Group Co.，Ltd.，Jinan，Shandong 250000，China)
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Abstract The mud pumping disease under multi-stage/multi-frequency train loading-wetting coupling seriously affects the normal operation of railways，and its mechanism is still unclear. The model test study on the mud pumping particle migration and dynamic characteristics in ballasted track subgrade under multi-stage/ multi-frequency train loading-wetting(MSC-W/MFC-W) coupling was carried out. The test results show that under the unsaturated state，there is no significant particle migration phenomenon in the two working conditions，the accumulated axial deformation under the MSC-W working condition is more significant than that under the MFC-W working condition；Under the saturated or near saturated condition，the two working conditions result in significant mud pumping phenomenon by the driving force of dynamic pore water pressure. The mud pumping degree，fine particle layer displacement and ballast fouling index under MFC-W working condition are significantly higher than those under MSC-W working condition；Thus，special attention should be given to the prevention and control of subgrade mud pumping during the speed-raising reconstruction of the existing railway with frequent rainfall.
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2024, Vol. 43 
