In this paper, a series of centrifuge model tests were carried out to clarify the effect of rock bolts on the stability of a tunnel roof in sandy ground. The results showed that rock bolts installed at the tunnel crown played a more important role in ensuring the stability of the tunnel roof than those installed at the tunnel sidewalls if the length and spacing were appropriate. Also the results showed that rock bolts installed with a certain inclination to the horizontal in the longitudinal section had the same effect as the rock bolts installed in the direction normal to the tunnel wall if the rock bolts of a certain length were installed with fairly dense spacing.
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