Excavation Technology of Tunnel with Square-to-circular Large Section of Yingliangbao Hydropower Project
The excavation of the large section cavern with a square-to-circular shape at the entrance of the diver-sion tunnel of the Yingliangbao Hydropower Station was carried out after the safety management,lock sup-port,advance pre-support and more.The pilot tunnel was excavated first,and then the technical parameters obtained from the excavation and the actual geological conditions revealed by the excavation are used to com-plete the complete expansion and segmented layered excavation.A large number of light blasting and pre-crack blasting technology was applied during the excavation,the key quality was grasped and process control was strictly controlled,effectively guaranteeing the engineering control target,achieving obvious effect,which can provide reference for similar engineering construction.
Yingliangbao Hydropower ProjectDiversion tunnelSquare-to-circular large sectionTunnel excava-tion technology
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