Stability analysis and optimization of excavation method of double-arch tunnel with an extra-large span based on numerical investigation

doi:10.1007/s11709-020-0710-8

Front. Struct. Civ. Eng.

2021, Vol. 15

Issue (1) : 136-146 https://doi.org/10.1007/s11709-020-0710-8

RESEARCH ARTICLE

Stability analysis and optimization of excavation method of double-arch tunnel with an extra-large span based on numerical investigation

Yiguo XUE(

), Huimin GONG, Fanmeng KONG, Weimin YANG, Daohong QIU, Binghua ZHOU

Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, China

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Abstract

The Xiamen Haicang double-arch tunnel has a maximum span of 45.73 m and a minimum burial depth of 5.8 m. A larger deformation or collapse of the tunnel is readily encountered during tunnel excavation. It is therefore necessary to select a construction approach that is suitable for double-arch tunnel projects with an extra-large span. In this study, three construction methods for double-arch tunnels with extra-large spans were numerically simulated. Subsequently, the deformation behavior and stress characteristics of the surrounding rock were obtained and compared. The results showed that the double-side-drift method with temporary vertical support achieves better adaptability in the construction of such tunnels, which can be observed from both the numerical results and in situ monitoring data. In addition, the improved temporary support plays a critical role in controlling the surrounding rock deformation. In addition, the disturbance resulting from the excavation of adjacent drifts was obvious, particularly the disturbance of the surrounding rock caused by the excavation of the middle drift. The present findings can serve as the initial guidelines for the construction of ultra-shallowly buried double-arch tunnels with extra-large spans.

Keywords double-arch tunnel triple-layer composite liner system numerical modeling stress analysis settlement

Corresponding Author(s): Yiguo XUE

Just Accepted Date: 31 December 2020 Online First Date: 05 March 2021 Issue Date: 12 April 2021

Cite this article:

Yiguo XUE,Huimin GONG,Fanmeng KONG, et al. Stability analysis and optimization of excavation method of double-arch tunnel with an extra-large span based on numerical investigation[J]. Front. Struct. Civ. Eng., 2021, 15(1): 136-146.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-020-0710-8
https://academic.hep.com.cn/fsce/EN/Y2021/V15/I1/136

Tab.1 Case information and statistics of typical double-arch tunnels

Fig.1 The tunnel calculation model: (a) CRD method; (b) double-side-drift method with vertical temporary support; (c) double-side-drift method with curved temporary support.

Tab.2 Physico-mechanical parameters of surrounding rock

Tab.3 Physico-mechanical parameters of the supporting structure

Fig.2 Division of the tunnel section: (a) CRD method; (b) double-side-drift method.

Fig.3 Comparison of stress field of surrounding rock: (a) CRD method; (b) double-side-drift method with vertical temporary support; (c) double-side-drift method with curved temporary support (unit: Pa).

Fig.4 The vertical stress change curve of the surrounding rock: (a) arch crown; (b) arch bottom; (c) sidewalls; (d) middle wall.

Fig.5 Comparison of displacement field of surrounding rock: (a) CRD method; (b) double-side-drift method with vertical temporary support; (c) double-side-drift method with curved temporary support (unit: m).

Fig.6 Comparison of arch crown settlement of three construction methods.

Fig.7 Displacement contours of the surrounding rock of double-side-drift method with vertical temporary support (unit: m).

Fig.8 The relation curves of arch crown settlement and excavation stages of tunnel: (a) left line; (b) right line.

Fig.9 Comparison of numerical results and in situ monitoring data: (a) No.1 drift; (b) No.3 drift; (c) No.5 drift.

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