Leakage-induced pore pressure and settlement of ground and shield tunnel in soft clay

Abstract:

This paper suggests a set of analytical solutions to study pore pressure distribution and long-term settlements of ground and tunnel due to tunnel leakage. The analytical solution is obtained based on the conformal mapping of the complex variable methods. The accuracy of the analytical solution is verified with numerical solutions. The results indicate that the relative permeability between soil and lining is essential for water inflow. The water inflow into the tunnel increases with the decrease of the relative permeability of soil and tunnel lining. The settlements of tunnel and ground increase linearly with the increase of water inflow. Therefore, the leakage of the shield tunnel should be monitored carefully and the corresponding waterproof measures should be adopted for operation tunnel to control the tunnel deformation and ground settlement.