Citation

Peng Y, Liu G, Huang Z, Lyu H, Wu L. China Saf. Sci. J. 2022; 32(5): 104-111.

Copyright

(Copyright © 2022, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2022.05.0887

PMID

unavailable

Abstract

In order to solve instability problems of tunnels blasting through rich water fault zones, based on instability mechanical model of tunnel-fault system under blasting, a cusp catastrophic model was established considering the combined effects of blasting and groundwater. Instability mechanism of surrounding rock under tunnel-fault system was revealed, and its instability criterion was developed. Then, with resource allocation project of Pingtan and Minjiangkou in Fujian as an example, rock stability of tunnels crossing water-rich fault zones was evaluated. The results show that the instability of surrounding rock is a result of internal and external factors. Due to long-term water-rock interaction and cumulative blasting, mechanical properties of surrounding rock in water-rich fault zones are constantly weakened, and catastrophe criterion, k value, is constantly reduced, which probably leads to instability and failure of the rock. The results of instability risk evaluation based on the criterion are consistent with field conditions. © PHYSOR 2022 China Safety Science Journal. All rights reserved.

Language: zh