Abstract Based on the Hoek-Brown criterion, the tunnel construction process under different bench lengths was simulated with finite-element simulation, and the displacement response laws of the tunnel section and ground surface were analyzed. The results show that: the horizontal convergence and vault settlement increase with an increase of the bench length; compared with a bench length of 2m, the vault settlements increase by 9%, 25%, 29%, and 36%, and the horizontal convergences increase by 9%, 12.5%, 15.6%, and 25% with the bench lengths of 4m, 6m, 8m and 10m; and bench length has little effect on the principal stress and plastic zone after excavation.
Abstract：
Based on the Hoek-Brown criterion, the tunnel construction process under different bench lengths was simulated with finite-element simulation, and the displacement response laws of the tunnel section and ground surface were analyzed. The results show that: the horizontal convergence and vault settlement increase with an increase of the bench length; compared with a bench length of 2m, the vault settlements increase by 9%, 25%, 29%, and 36%, and the horizontal convergences increase by 9%, 12.5%, 15.6%, and 25% with the bench lengths of 4m, 6m, 8m and 10m; and bench length has little effect on the principal stress and plastic zone after excavation.
ZHAO Jing-Bo
.Study of the Mechanical Properties of Bench Length Based on the Hoek-Brown Criterion
[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(5): 66-70
2014, Vol. 51 