What question did this study set out to answer?

To evaluate the mechanical response of the surrounding rock-support system under different excavation methods in extra-large-span continuous variable-cross-section tunnels and identify optimal construction controls.

August 19, 2026Applied SciencesOpen Access

A Study on Construction Control of Extra-Large-Span Asymmetric Variable-Cross-Section Tunnels

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Authors

JYJingxue Yuan WGWenbo Gong QJQihang Ji

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Overview

Numerical modeling study reveals distributed double sidewall drift excavation optimizes stress and deformation in extra-large tunnels, indicating improved stability in geometric transition zones.

Key Points

To evaluate the mechanical response of the surrounding rock-support system under different excavation methods in extra-large-span continuous variable-cross-section tunnels and identify optimal construction controls.
Established a 3D finite element numerical model across three continuous variable cross-section segments (Sections A, B, and C) and validated it with field monitoring data from three representative sections.
Systematically compared three construction techniques: Distributed Bench Excavation Method (DBM), Double Sidewall Drift Method (DSM), and Distributed Double Sidewall Drift Method (DDSM).
Section transition zones (A → B and B → C) exhibited the highest sensitivity to stress and deformation surges.
Compared with DBM, DDSM reduced Section A vault initial support stress by 38.1% (from 6.51 to 4.03 MPa), spandrel stresses by 17.9% (left) and 26.9% (right), and peak bolt axial forces by over 20%.
While DSM achieved the greatest reduction in lateral haunch convergence (32.8% in Section C), DDSM delivered superior comprehensive control by restricting vault settlement and balancing support stress distribution.

Cite This Study

Yuan et al. (2026) studied this question.

synapsesocial.com/papers/6a858aaf03308d306e2d7fe6 https://doi.org/10.3390/app16168155

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August 19, 2026Applied SciencesOpen Access

A Study on Construction Control of Extra-Large-Span Asymmetric Variable-Cross-Section Tunnels

View Full Paper

Ask AI

Bookmark

Authors

JYJingxue Yuan WGWenbo Gong QJQihang Ji

Discussion

Member takes

Overview

Numerical modeling study reveals distributed double sidewall drift excavation optimizes stress and deformation in extra-large tunnels, indicating improved stability in geometric transition zones.

Key Points

To evaluate the mechanical response of the surrounding rock-support system under different excavation methods in extra-large-span continuous variable-cross-section tunnels and identify optimal construction controls.
Established a 3D finite element numerical model across three continuous variable cross-section segments (Sections A, B, and C) and validated it with field monitoring data from three representative sections.
Systematically compared three construction techniques: Distributed Bench Excavation Method (DBM), Double Sidewall Drift Method (DSM), and Distributed Double Sidewall Drift Method (DDSM).
Section transition zones (A → B and B → C) exhibited the highest sensitivity to stress and deformation surges.
Compared with DBM, DDSM reduced Section A vault initial support stress by 38.1% (from 6.51 to 4.03 MPa), spandrel stresses by 17.9% (left) and 26.9% (right), and peak bolt axial forces by over 20%.
While DSM achieved the greatest reduction in lateral haunch convergence (32.8% in Section C), DDSM delivered superior comprehensive control by restricting vault settlement and balancing support stress distribution.

Cite This Study

Yuan et al. (2026) studied this question.

synapsesocial.com/papers/6a858aaf03308d306e2d7fe6 https://doi.org/10.3390/app16168155

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