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Home > Archive>Volume 49, Issue 3, 2021 >421-430. DOI:10.11908/j.issn.0253-374x.20315
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Monitoring and Numerical Study of Long-Term Settlement of Track Bed with Sparse Pile Foundation for Tram
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1.Shanghai Urban Construction Design and Research Institute(Group) Co.， Ltd.， Shanghai 200125， China;2.Department of Geotechnical Engineering， Tongji University， Shanghai 200092， China;3.Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education， Tongji University， Shanghai 200092， China

Clc Number:

TU433

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    Abstract:

    The track bed with sparse pile foundation was developed to avoid the excessive settlement of track beds due to long-term cyclic wheel-pressure. To understand the settlement development， a two-year monitoring of an actual tram project in a southern city in China was reported. The results reveal that the settlement of the track bed increased rapidly in the initial stage. The settlement gradually reduced after around one year and tends to be stable after two years. Moreover， based on the explicit cumulative strain model， an equivalent finite element method is proposed for predicting the long-term cumulative settlement of the track bed with sparse pile foundation. A good agreement between the monitored and calculated results demonstrates the rationality. Furthermore， discussions on the bearing mechanism of the track bed with sparse pile foundation are presented.

    Table 1
    Fig.1 Project route and track bed with sparse pile foundation
    Fig.2 Map of large sample view of settlement observation point and settlement measurement point （unit:mm)
    Fig.3 Monitored settlements at D089 and D206
    Fig.4 Distribution map of soil layer of D089 and D206
    Fig.5 Schematic diagram of initial strain method
    Fig.6 Finite element model
    Fig.7 Process of dynamic triaxial test
    Fig.8 Vertical displacement of 340 000 cycles
    Fig.9 Comparison of vertical displacement results of each cycle
    Fig.10 Comparison of monitored and calculated results at D089
    Fig.11 Vertical displacement of 340 000 cycles (unit: m)
    Fig.12 Comparison of results of vertical displacement of each cycle
    Fig.13 Comparison of monitored and calculated results at D206
    Fig.14 Comparison of settlement of “track bed with sparse pile” and “ballastless track bed”
    Fig.15 Comparisons of settlement contours at 700 000 cycles
    Table 2
    Table 3
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XU Zhengliang, LIU Lei, WANG Haoran, YU Jian, HUANG Maosong. Monitoring and Numerical Study of Long-Term Settlement of Track Bed with Sparse Pile Foundation for Tram[J].同济大学学报(自然科学版),2021,49(3):421~430

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History
  • Received:August 07,2020
  • Online: April 06,2021
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