Volume 21 Issue 4
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GU Shuan-cheng, SUN Guan-lin, SU Pei-li. Computational model of outer-circle and inner-ellipse shield tunnel lining structure[J]. Journal of Traffic and Transportation Engineering, 2021, 21(4): 94-105. doi: 10.19818/j.cnki.1671-1637.2021.04.006
Citation: GU Shuan-cheng, SUN Guan-lin, SU Pei-li. Computational model of outer-circle and inner-ellipse shield tunnel lining structure[J]. Journal of Traffic and Transportation Engineering, 2021, 21(4): 94-105. doi: 10.19818/j.cnki.1671-1637.2021.04.006
shu

Computational model of outer-circle and inner-ellipse shield tunnel lining structure

doi: 10.19818/j.cnki.1671-1637.2021.04.006
  • 1.

    School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, Shaanxi, China

  • 2.

    Xi'an Key Laboratory of Geotechnical and Underground Engineering, Xi'an University of Science and Technology, Xi'an 710054, Shaanxi, China

Funds:

National Natural Science Foundation of China 41672305

Open Foundation of Xi'an Key Laboratory of Geotechnical and Underground Engineering XKLGUEKF20-03

China Postdoctoral Science Foundation 2017M623330XB

More Information
  • Author Bio:

    GU Shuan-cheng(1963-), male, professor, PhD, 790480485@qq.com

  • Corresponding author: SUN Guan-lin(1993-), male, doctoral student, sunguanlin067@163.com
  • Received Date: 2021-02-12
    Available Online: 2021-09-16
  • Publish Date: 2021-08-01
    Abstract
  • In order to adapt the metro tunnel to the inhomogeneity of stratum load, referring to the structural form of special-shaped shield tunnel lining and taking into account the factors such as production and construction, the outer-circle and inner-elliptic shield tunnel lining structure was proposed, ensuring that the stiffness of the most unfavorable position of the lining structure meets the safety requirement, appropriately reducing the stiffness of the rest of the lining structure, and taking advantage of material properties. The flexibility coefficient and free term of outer-circle and inner-elliptic shield tunnel lining were solved by the stiffness step discounting method, and the calculation model of the lining was established. Referring to the actual engineering geological condition, the internal force distribution characteristics of outer-circle and inner-elliptic shield tunnel lining were studied. The safety of outer-circle and inner-elliptic shield tunnel lining was evaluated by the Code for Design of Railway Tunnel (TB 1003—2016). Calculation results show that compared with the equal stiffness shield tunnel lining, under the same loading condition, the outer-circle and inner-elliptic shield tunnel lining reduces the bending moments at the top and bottom of the lining structure, and transfers the maximum bending moment and maximum axial force to the arch waist, which simplifies the safety test by focusing on whether the internal force at the arch waist of the lining structure can meet the safety condition during the test. In terms of stability, the safety factors of equal stiffness shield tunnel lining are 3.07, 18.05 and 2.45 at the vault, arch shoulder and arch waist, respectively. The safety factors of outer-circle and inner-elliptic shield tunnel lining are 2.79, 14.86 and 2.21 at the vault, arch shoulder and arch waist, respectively, and slightly lower than those of the equal stiffness shield tunnel lining, but still greater than the minimum value 2.0 stipulated by the safety checking requirement, giving full play to the material characteristics of concrete. In terms of internal space, when the outer-circle and inner-elliptic shield tunnel lining and the equal stiffness shield tunnel lining have the same outer radius, the internal space area of the equal stiffness shield tunnel lining is 22.9 m2, and the value of the outer-circle and inner-elliptic shield tunnel lining is 23.76 m2 and significantly larger than that of the equal stiffness shield tunnel lining. Therefore, the area and utilization rate of internal space of the proposed lining increase without expanding the outer radius. 8 tabs, 11 figs, 31 refs.

     

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