Effect of Floating Slab Track Transition Section Parameters on Dynamic Responses of Subway Tunnel-Soil System
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1.Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 201804, China;2.Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, Shanghai 201804, China

Clc Number:

U211.3

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    Abstract:

    To study the dynamic response of the tunnel and soil when the subway train passes the transition section of the floating slab track, this paper proposed a semi-analytical ring layered element for the efficient calculation of the tunnel-saturated soil vibration in time domain. Taking into consideration of the train-track model, the coupled dynamic model of the train-floating slab track transition section-tunnel-soil system was finally established. The effects of the parameters of the floating slab transition section (i.e., the length and the stiffness of the steel spring) on the tunnel acceleration, soil normal stress and pore water pressure were studied. The results show that the parameter design of the floating slab track transition section needs to focus the dynamic responses at the two positions of sudden changes in stiffness of the transition section. The scheme of the gradient in steel spring stiffness can reduce the three evaluation indexes of the dynamic response by 60%, 15% and 25% respectively.

    Table 2
    Table 1
    Fig.1 Dynamic model of coupled train-track-tunnel-soil system
    Fig.2 Tunnel-saturated soil coupled model: model outline, principle directions, and corresponding displacement components
    Fig.3 Comparison of vibration response in tunnel-soil system between proposed model and PiP model
    Fig.4 Vertical acceleration of tunnel bottom when a subway train passes transition section of a floating slab track
    Fig.5 Distribution of maximum soil normal stress generated when a subway train passes transition section of a floating slab track
    Fig.6 Pore water pressure generated below tunnel when a subway train passes transition section of a floating slab track
    Fig.7 Variation of train-induced vibration responses of subway tunnel and soil with the length of floating slab transition section
    Fig.8 Variation of train-induced vibration responses of subway tunnel and soil with stiffness of steel springs in floating slab transition section
    Fig.9 Variation of train-induced vibration responses of subway tunnel and soil with gradual change of stiffness in floating slab transition section
    Table 3
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ZHANG Xiaohui, ZHANG Zeyu, DI Honggui, HE Chao. Effect of Floating Slab Track Transition Section Parameters on Dynamic Responses of Subway Tunnel-Soil System[J].同济大学学报(自然科学版),2021,49(1):67~75

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History
  • Received:October 10,2020
  • Online: February 26,2021
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