Journal
ROCK MECHANICS AND ROCK ENGINEERING
Volume 54, Issue 12, Pages 6393-6411Publisher
SPRINGER WIEN
DOI: 10.1007/s00603-021-02630-9
Keywords
Large cross-section tunnel blasting; Surrounding rock; Cumulative damage effects; Single full-face blasting; Multiple full-face blasting
Funding
- National Natural Science Foundation of China (NSFC) [41972286]
- Natural Science Foundation of Hubei Province of China (NSFH) [2017CFB310]
- NSFC
- NSFH
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The study reveals that multiple full-face blasting provides more accurate simulation of tunnel blasting process and has a significant impact on the maximum damage depth in the middle of the tunnel invert.
The cumulative damage effects of surrounding rock under single full-face blasting and multiple full-face blasting of a large cross-section tunnel are comparatively studied in this paper. The damage processes of the single and multiple full-face blasting of the tunnel are simulated by the established rock damage model embedded into the LS-DYNA computer code through its user subroutines and a cumulative damage simulation technology in the LS-DYNA. The simulation results are verified against field test data. The results demonstrate that the numerically predicted peak particle velocity (PPV) of the surrounding rock under multiple full-face blasting is more consistent with field test data than that under single full-face blasting, which indicates the advantages of multiple full-face blasting in comparison to single full-face blasting in simulating the blasting process of a tunnel. The maximum damage depth in the middle of the tunnel invert is mostly affected by multiple full-face blasting. Both the maximum damage depth and the maximum PPV occur in the middle of the tunnel invert under single and multiple full-face blasting. Based on the defined damage threshold D-cr and the modeled maximum damage depth of the surrounding rock, the influence of initiation sequence on the critical PPV for rock damage is analyzed, and a critical PPV of rock damage is proposed to provide a safety criterion for tunnel blasting excavation.
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