Numerical Simulation of Surface Settlement Induced by Tunneling Considering Noncoaxiality

CHEN Zhouquan; CHEN Xiangsheng; PANG Xiaochao; SU Dong; LIN Xingtao

doi:10.3973/j.issn.2096-4498.2023.01.010

Tunnel Construction >

2023 , Vol. 43 >Issue 1: 92 - 101

DOI: https://doi.org/10.3973/j.issn.2096-4498.2023.01.010

Numerical Simulation of Surface Settlement Induced by Tunneling Considering Noncoaxiality

CHEN Zhouquan ,
CHEN Xiangsheng ,
PANG Xiaochao ,
SU Dong ,
LIN Xingtao

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(1.College of Civil and Transportation Engineering, Shenzhen University,Shenzhen 518060,Guangdong,China;2.Key Laboratory for Resilient Infrastructures of Coastal Cities (MOE),Shenzhen University,Shenzhen 518060,Guangdong,China;3.Underground Polis Academy,Shenzhen University,Shenzhen 518060,Guangdong,China;4.Shenzhen Key Laboratory of Green,Efficient and Intelligent Construction of Underground Metro Station,Shenzhen 518060,Guangdong,China;5.Shenzhen Research and Design Institute of China Academy of Railway Sciences,Shenzhen 518060,Guangdong,China)

Online published: 2023-02-16

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Abstract

The constitutive model, which is closely related to deformation noncoaxiality induced by stress rotation, is used to investigate the influence of noncoaxiality on tunnel engineering simulation results. First, a noncoaxial model is formulated by incorporating the noncoaxial flow rule into the DruckerPrager considering the hyperbolic hardening rule. Subsequently, necessary deduction of the iteration process of the semiimplicit algorithm for the model is completed. Based on previous theoretical results, the semiimplicit algorithm is programmed into ABAQUS/Standard using the user subroutine UMAT. Finally, a typical finite element model for the tunneling in the plane strain is applied to the numerical analysis. The calculated results show the following: (1) Two intersecting plastic bands are developed from the waist of the tunnel. The longer band originates from the model with a smaller noncoaxial modulus. (2) The smaller noncoaxial modulus results in a larger zone with stress rotation and a larger extent of the rotation of the principal stress. (3) A model with a smaller noncoaxial modulus produces a larger surface settlement induced by the tunneling. (4) The extent of convergence of the tunnel at the bottom and along the sides increases with decreasing noncoaxial modulus.

Key words： noncoaxiality; soil deformation； semiimplicit integration algorithm; tunnel excavation; surface settlement

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CHEN Zhouquan , CHEN Xiangsheng , PANG Xiaochao , SU Dong , LIN Xingtao .

Numerical Simulation of Surface Settlement Induced by Tunneling Considering Noncoaxiality

[J]. Tunnel Construction, 2023 , 43(1) : 92 -101 . DOI: 10.3973/j.issn.2096-4498.2023.01.010

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