Volume 23 Issue 4
Aug.  2023
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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2023  >  23(4): 190-204
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XU Jing-min, XU Cheng-hua, SHI Ye-hui, ZHANG Ding-wen, XU Tao, XU Wen, CHENG He-lan. Responses of loose sand ground and surface structure caused by tunnel construction[J]. Journal of Traffic and Transportation Engineering, 2023, 23(4): 190-204. doi: 10.19818/j.cnki.1671-1637.2023.04.014
Citation: XU Jing-min, XU Cheng-hua, SHI Ye-hui, ZHANG Ding-wen, XU Tao, XU Wen, CHENG He-lan. Responses of loose sand ground and surface structure caused by tunnel construction[J]. Journal of Traffic and Transportation Engineering, 2023, 23(4): 190-204. doi: 10.19818/j.cnki.1671-1637.2023.04.014
shu

Responses of loose sand ground and surface structure caused by tunnel construction

doi: 10.19818/j.cnki.1671-1637.2023.04.014
  • 1.

    School of Transportation, Southeast University, Nanjing 211189, Jiangsu, China

  • 2.

    Tunnel and Underground Engineering Research Center of Jiangsu Province, Nanjing 210041, Jiangsu, China

Funds:

National Natural Science Foundation of China 52108364

National Natural Science Foundation of China 52278398

Fundamental Research Funds for the Central Universities 2242022R10086

Open Fund Research Ptoject of Tunnel and Underground Engineering Research Center of Jiangsu Province 2021-SDJJ-03

More Information
  • Author Bio:

    XU Jing-min (1992-), male, assistant professor, PhD, jingmin_xu@seu.edu.cn

  • Received Date: 2023-02-14
  • Publish Date: 2023-08-25
    Abstract
  • Four centrifuge tests were performed to simulate the construction of tunnels with the relative depths (burial depth-diameter ratio) of 1.3 and 2.0 in the sand ground, and the migration and deformation laws of soil layers and ground buildings were analyzed. The ground volume loss caused by tunnel construction was modelled by extracting the liquid from the model tunnel, and a two-storey aluminum frame structure model was designed. The movement data of the strata and structure caused by tunnel construction were measured by particle image velocimetry (PIV), and the horizontal and vertical displacements of the surface and building raft foundation, the movement and shear deformation of the deep ground, the shear deformation and classification of the frame structure, as well as the shear deformation modification factor of the building and relative shear stiffness were analyzed. Research results show that the surface settlement trough width increases from 3.4 m to 5.6 m when tunnel relative depth increases from 1.3 to 2.0, and the maximum settlement of ground building increases from 32.3 mm to 49.5 mm, but the deformation degree decreases. The deformation of ground frame structure due to tunnel construction mainly exhibits shear deformation, and the proportion of bending deformation is negligible. The contractive deformation of loose sand soil due to tunnel construction leads to the fact that the volume loss of surface ground is always greater than the tunnel, and a deeper tunnel indicates a greater difference. A large gap (27 mm) exists between the building raft foundation and the ground in the shallow tunnel test, whereas no gap forms in the deep tunnel test, thereby increasing the constraint of the building raft foundation on the horizontal movement of the surface soil. The building shear deformation modification factor decreases gradually with the increase in tunnel volume loss, and the change rate of shallow tunnel is greater. The data of building shear deformation modification factor-relative shear stiffness for the two relative tunnel depths are within the existing empirical envelopes, indicating that the shear deformation modification factor is also applicable to the deep tunnel.

     

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