Citation

Lin H, Cao P, Fang J, Liu Q. Disaster Adv. 2012; 5(4): 220-225.

Copyright

(Copyright © 2012, Shankar Gargh)

DOI

unavailable

PMID

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Abstract

The timbering time of the tunnel is an important content of tunnel design and the accurate confirmation of reasonable timbering time of the second liner plays an important role in giving play to the fully self-supporting capacity of surrounding rock. However, the rheological property of rock mass has seldom been considered in previous researches concerning the timbering time of the second liner of tunnels. As there is a time process in the instability or damage of rock mass engineering, which is influenced by the rheological property of rock and as the timbering time of second liner of tunnels is concerned with the problem of timeliness of rock mass deformation, so the influence from rheological properties of surrounding rock should be more often considered. Therefore, in order to study the timbering time of the second liner of tunnels in the rheological property cases of rock mass, this paper first deduces the expressions for the resistance, displacement of lining and displacement of surrounding rock. Then, it takes the rock mass of the tunnel section in Gaoyao(Guangdong Province)-Wuzhou Expressway as the engineering background to discuss the method of confirming the timbering time of the second liner of tunnels in rheological cases of rock mass and to compare the measured value and theoretical calculation value on sinking vaults of surrounding rock. The analysis results indicate that the time-distance curve of the predicted sinking vault presents the same developmental law as the actual field measurement when considering the rheological effect and that their timbering time is the same basically, thus verifying the correctness of the method.