Abstract Using the Suzhou Chengbei Road utility tunnel project as the case study, numerical simulations were con?
ducted to investigate the deformation patterns of metro tunnels induced by the construction of a large-section rectangular pipe jacking over-crossing the tunnels, focusing on tunnel uplift and surface settlement. The results indicate that pipe jacking construction reduces the load above the metro tunnels, leading to an imbalance in soil and water pressure. After applying anti-uplift counterweights inside the jacking pipe, the uplift of the right-line tunnel decreased by 28.0%, and that of the left-line tunnel decreased by 35.5%, effectively controlling the uplift deformation of the metro tunnels. Additionally, the horizontal displacement of the right-line tunnel was reduced by 61.6%, and that of the left-line tunnel was reduced by 55.9%, significantly mitigating tunnel horizontal displacement. The counterweights also reduced the maximum positive bending moment at the tunnel crown and the maximum negative bending moment at the haunches by 33.1% and 32.9%, respectively. Although surface settlement increased by approximately
1 mm, the impact is considered minor.
Abstract：
Using the Suzhou Chengbei Road utility tunnel project as the case study, numerical simulations were con?
ducted to investigate the deformation patterns of metro tunnels induced by the construction of a large-section rectangular pipe jacking over-crossing the tunnels, focusing on tunnel uplift and surface settlement. The results indicate that pipe jacking construction reduces the load above the metro tunnels, leading to an imbalance in soil and water pressure. After applying anti-uplift counterweights inside the jacking pipe, the uplift of the right-line tunnel decreased by 28.0%, and that of the left-line tunnel decreased by 35.5%, effectively controlling the uplift deformation of the metro tunnels. Additionally, the horizontal displacement of the right-line tunnel was reduced by 61.6%, and that of the left-line tunnel was reduced by 55.9%, significantly mitigating tunnel horizontal displacement. The counterweights also reduced the maximum positive bending moment at the tunnel crown and the maximum negative bending moment at the haunches by 33.1% and 32.9%, respectively. Although surface settlement increased by approximately
1 mm, the impact is considered minor.
XUE Qingsong
.Deformation Distribution Characteristics and Control Measures of
Large-section Rectangular Pipe Jacking Over-crossing Metro Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2024,V61(6): 148-161
2024, Vol. 61 