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Home > Archive>Volume 49, Issue 2, 2021 >180-187. DOI:10.11908/j.issn.0253-374x.20232
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Stress Characteristics of Variable- section Lining Trolley of Super-large Section Tunnel
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1.Key Laboratory of Road and Traffic Engineering of the Ministry of Education， Tongji University， Shanghai 201804， China;2.College of Transportation Engineering， Tongji University， Shanghai 201804， China;3.The Fourth Company of China Railway No.5 Engineering Group Co.， Ltd.， Shaoguan 512031， China

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U25

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    Abstract:

    Based on the Badaling Great Wall Station of Beijing-Zhangjiakou High-speed Railway， the dynamic and static stresses of variable-section lining trolley of super-large section tunnel were studied， and the effect of cross-sectional changes on the trolley structure was analyzed. Numerical simulation was used to analyze the static stress characteristics of the trolley structure， and the field monitoring was used to analyze the dynamic stress characteristics of the trolley structure and the influence law of cross-sectional changes on the stress of the trolley structure. The results show that： the static stress and the displacement of the trolley structure are unevenly distributed， and each structure is variable， with some structures showing obvious stress concentration. During the pouring process， the stress is larger on the outside and smaller on the inside； the stress value is the largest when the trolley pouring area is located above the supporting structure， and the stress of the trolley structure is basically constant during the concrete solidification process. As the cross section of the trolley becomes larger， the stress of each trolley structure increases. The arch shoulder screw is the member with the greatest change in stress.

    Table 2
    Table 1
    Fig.1 Plan of large-span transition section
    Fig.2 Cross-sectional view of large-span transition section
    Fig.3 Structure of gantry system
    Fig.4 Structure of sidewall support
    Fig.5 Structure of arch support
    Fig.6 Structure of lining trolley for long-span transition section
    Fig.7 Numerical model of section 5 trolley
    Fig.8 Axial force of the trolley
    Fig.9 Axial stress of the trolley
    Fig.10 Displacement of the trolley
    Fig.11 Layout of monitoring points
    Fig.12 Stress-time curve of section 5 trolley
    Fig.13 Change of peak stress of trolley structure with section
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WANG Hao, YANG Xin’an, LUO Chi, LIU Zhenwu. Stress Characteristics of Variable- section Lining Trolley of Super-large Section Tunnel[J].同济大学学报(自然科学版),2021,49(2):180~187

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  • Received:June 13,2020
  • Online: March 18,2021
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