Nguyen, Hoang 
ORCID: 0000-0001-6599-2790
(2022)
Seismic stability of a circular tunnel in cohesive-frictional soils using a stable
node-based smoothed finite element method.
Tunnelling and Underground Space Technology, 130.
p. 104606.
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TUSTNguyenVoMinh2022.pdf - Author Accepted Manuscript Download (2MB) | Preview |
Abstract
This paper presents the effect of horizontal and vertical earthquake force on the stability of a single circular tunnel in cohesive-frictional soils using a stable node-based smoothed finite element method (SNS-FEM). In this study, seismic forces are computed as horizontal and vertical pseudo-static body forces arising on the soil and additional inertial forces associated with the uniform surcharge applied to the ground surface. In the upper bound limit analysis based on SNS-FEM, the soil behaviour is described as rigid-perfectly plastic materials, and plasticity deformation obeys the associated flow rule following the Mohr-Coulomb failure criterion. Firstly, the numerical results were checked against other numerical solutions in the literature. The present results agree with prior contributions, proving that the proposed approach can give efficient and reliable solutions to the stability number. Secondly, the variations of the seismic stability number with changes in the horizontal earthquake acceleration coefficient were intensively investigated for different values of soil properties, internal friction angle and the depth-to-diameter ratio of the tunnel. It is shown that the seismic stability numbers of circular tunnels reduce remarkably with the increase of horizontal seismic coefficient and the soil weight. Thirdly, the seismic stability numbers were summarised in design charts for practical use in geotechnical engineering.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Circular tunnel, Limit analysis, SNS-FEM, SOCP, Seismic stability, Seismic force |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 11 Oct 2022 08:34 |
| Last Modified: | 05 Oct 2023 01:30 |
| DOI: | 10.1016/j.tust.2022.104606 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3164975 |
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