Optimization Design of Transition Connection between Prestressed Lining and Steel-Concrete Composite Lining in High Water Pressure Tunnels

The Pearl River Delta Water Resources Allocation Project aims to solve the water conflict in this area and ensure the water use in water scarce areas and eastern Guangdong. The water conveyance tunnel project adopts a multi-layer lining structure to improve the bearing and deformation capacity of the structure due to its deep burial, high internal water pressure, and many cross domain areas. Due to the long distance and cross basin nature of the project, considering factors such as surrounding rock and external loads, multiple lining methods were chosen to achieve it, including steel concrete lining and prestressed lining.