Journal of Shanghai Jiao Tong University ›› 2022, Vol. 56 ›› Issue (7): 886-896.doi: 10.16183/j.cnki.jsjtu.2020.412

• Transportation Engineering • Previous Articles     Next Articles

Centrifugal Test and Numerical Analysis of Impact of Surface Surcharge on Existing Tunnels

LIU Jinhao1, YAN Yuanzhong1, ZHANG Qi1, BIAN Rong2, HE Lei3, YE Guanlin1()   

  1. 1. Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
    2. Economic and Technological Research Institute, State Grid Zhejiang Electric Power Company, Hangzhou 310012, China
    3. China Electric Power Research Institute, Beijing 102401, China
  • Received:2020-12-01 Online:2022-07-28 Published:2022-08-16
  • Contact: YE Guanlin


Surface surcharge has a significant impact on the safety and stability of existing underground tunnels, and relevant regulations in soft clay areas have very strict restrictions on the tunnel displacement caused by surface surcharge. In order to accurately assess the impact of surface surcharge on the tunnel displacement in soft clay areas, the influence of surface surcharge on tunnel displacement and soil deformation is studied by using the centrifugal model test, and a corresponding finite element model is established based on the centrifugal model test. The parameter values of the soil constitutive model are determined by indoor soil tests. From the aspects of soil strain and shear stiffness, the applicability of the HS model and the HSS model in the analysis of the soft clay surface surcharge problem is compared and analyzed. Based on the result, the influence of surface surcharge on the deformation of soft clay formation and tunnel displacement is further discussed while comprehensively considering the size of the surface surcharge and the location of the tunnel. The results can provide some reference for engineering design.

Key words: surface surcharge, centrifugal model test, small-strain constitutive model, numerical simulation

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