Study on the Construction Influence of Three-line Parallel Tunnel with Minimal Distance
In order to find out the disturbance law of the shield tunneling of the post-built tunnel of the three-line parallel shield tunnel project on the pre-built tunnel structure,the monitoring work of the pre-built shield tunnel tunneling parameters and soil pressure during the shield tunneling process is carried out.The control methods of shield tunneling in parallel tunnels with minimal distance and the structural enhancement measures of pre-built tunnels are summarized.The research results show that the shield attitude control,especially the horizontal attitude control,has a great influence on the deformation of the existing structure in the process of shield tunneling in parallel tunnels with minimal distance.The pre-built shield tunnel jacking trolley can effectively control the deformation of the segment lining structure and play a supporting role in the strata between parallel tunnels.The multi-line parallel construction of shield tunnel is a dynamic process of the original equilibrium state to disturbance state,and reaching the equilibrium state again.The deformation of the tunnel structure and surrounding rock can be controlled by reducing the strength of the disturbance source and enhancing the stiffness of the disturbed body.
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