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• W2550108309 abstract "Deep-embedded pile-board structure, which is implanted in foundation, changes the dynamic properties of embankment system significantly. Taking ballastless track structure into account, the system's stiffness distribution is rigid in upper and lower end and soft in middle, which increases the stress and complexity of subgrade bed. Therefore, it is necessary to specialize in the dynamic performance of low embankment on rigid foundation. Based on dynamic test system, a series of in-situ cyclic vibration tests are carried out by simulating train load in Beijing-Shanghai High-speed Railway. Dynamic response of different section and different depth is obtained and vibration characteristics and long-term dynamic properties of low embankment on rigid foundation are analyzed. The result shows that low embankment of deep-embedded pile- board structure will not resonate in train's frequency range, and dynamic response tend to be stable after 0.7 million times' vibration and displacement amplitude of each section is less than 0.1 mm. Dynamic stiffness of subgrade surface is in range of 280-350 MN/m, and the stiffness differences among sections are very small. After 1.5-2.0 million times' vibration, structure's accumulated deformation is 0.3-0.4 mm, which indicates the structure system of ballastless track, subgrade bed, pile-board structure and foundation has satisfactory long- term dynamic stability." @default.
• W2550108309 created "2016-11-30" @default.
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• W2550108309 date "2015-01-01" @default.
• W2550108309 modified "2023-09-24" @default.
• W2550108309 title "Study on Dynamic Performance of Deep-Embedded Pile-Board Subgrade in Soft Soil Area" @default.
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