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The study aims to improve stability assessment methods for deep tunnel faces by incorporating excavation disturbance effects.

April 19, 2026ProcessesOpen Access

Vertical Discretization Analysis of Tunnel Face Stability in Deep Tunnels

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The study aims to improve stability assessment methods for deep tunnel faces by incorporating excavation disturbance effects.
Developed a vertical discretization method to analyze tunnel stability.
Established a stability analysis model incorporating weakened rock mass parameters.
Calculated equivalent rock mass parameters using the Hoek–Brown criterion and Mohr–Coulomb transformation.
Conducted stability analysis using limit analysis and virtual power principles.
Validated the model through numerical simulations.
The proposed model runs in about 90 seconds, significantly faster than the 7 hours required for 3D numerical models.
Excavation disturbance was found to significantly reduce rock mass strength.
GSI was identified as the most critical parameter for tunnel stability, followed by Dr, h1, and mi.
Controlling excavation disturbance is essential for maintaining deep tunnel stability.

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This analysis demonstrates improved tunnel face stability assessment in deep tunnels, suggesting methods to enhance safety.

Zhang et al. (2026) studied this question.

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