渝万高铁光裕寨隧道顺利贯通

Core Viewpoint - The successful completion of the Guangyuzhai Tunnel marks a significant milestone in the construction of the Yuwan High-Speed Railway, which is crucial for enhancing regional transportation and economic development in Northeast Chongqing [1][7]. Group 1: Project Details - The Guangyuzhai Tunnel, located in Wanzhou District of Chongqing, has a total length of 8,575 meters and a maximum burial depth of approximately 350 meters, making it one of the key challenging projects along the Yuwan High-Speed Railway [3][4]. - The tunnel construction faced complex geological conditions, including the presence of weak surrounding rock and the need to pass under existing transportation lines, such as the Dawan Railway and G42 Hu-Rong Expressway, with a minimum clearance of only 19 meters at the interchange [3][4]. Group 2: Construction Techniques - The project team from China Railway 11th Bureau implemented an auxiliary tunnel scheme using "central inclined shaft + exit lateral tunnel" to achieve efficient construction goals [4]. - Innovative construction techniques were employed, including controlled blasting and a two-step excavation method for the entrance section, as well as a non-blasting three-step excavation for the exit section, which helped to minimize disturbance to surrounding rock and ensure the safety of existing lines [4]. Group 3: Economic Impact - Once completed, the Yuwan High-Speed Railway will reduce the travel time from downtown Chongqing to Wanzhou to under one hour, significantly improving the regional high-speed rail network and promoting high-quality economic and social development in Northeast Chongqing [7].