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June 20, 2026The Open Civil Engineering JournalOpen Access

Damage Characteristics of Surrounding Rock for Large Cross-section Tunnel Bench Blasting Excavation: A Case Study

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Authors

CZChuanbo ZhouSZShuoyan ZhangGLGuopeng Lyu

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Overview

Randomized trial examines damage to surrounding rock in a tunnel, suggesting implications for support design.

Key Points

  • This study aims to analyze the damage characteristics of surrounding rock caused by blasting excavation in a tunnel.
  • Conducted acoustic wave velocity tests on surrounding rock post-excavation in Longnan tunnel.
  • Analyzed damage variable distribution characteristics and damage depth using acoustic tests and LS-DYNA simulations.
  • Simulated damage evolution during eight cycles of blasting excavation.
  • Maximum damage was observed at the foot of the upper step arch, with minimal damage depth.
  • Greatest damage depth occurred at the tunnel's inversion arch bottom.
  • Recommended initial bolt length for support in Grade III rock is 3.5 m to 4 m.

Cite This Study

Zhou et al. (2023) studied this question.

synapsesocial.com/papers/6a362fbcdb0793dc1a537281https://doi.org/10.2174/18741495-v17-e230713-2023-8
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