A practical approach for modeling twin-tunnel excavation in Ho chi minh city

  • Hong Lam Dang

    University of Transport and Communications, No. 3 Cau Giay Street, Hanoi, Vietnam
  • Thi Quynh Chi Dang

    University of Transport and Communications, No. 3 Cau Giay Street, Hanoi, Vietnam
  • Ba Dong Nguyen

    University of Transport and Communications, No. 3 Cau Giay Street, Hanoi, Vietnam
Email: dang.hong.lam@utc.edu.vn
Từ khóa: twin-tunnel, Soil modelling, ground surface settlement, Excavation

Tóm tắt

The prediction of ground settlement under tunnel excavation is still challenge. Almost engineer uses Mohr-Coulomb model in practice due to the conventional geotechnical investigation data. This paper describes the study of tunnel lining behaviors and ground surface settlement under tunneling process with a typical case study of twin tunnels excavation in Ho Chi Minh city, Vietnam. The advanced material model namely Hardening Soil model is used to investigate the proposing twin-tunnel with numerical approach. The internal forces of tunnel lining and ground settlement, which achieved from Hardening Soil model and the available results from Mohr-Coulomb model, are then made comparison between two models which yields some important differences for analysis. Since the experimental works for qualifying stiffness parameters in Hardening Soil model are missed in the Metro Line 1 project in Ho Chi Minh city, an empirical formula is proposed in the paper as a guide for estimating the required data in modelling process

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