国内首批下穿太湖超大直径盾构机成功下线

Core Viewpoint - The construction of the Xiyi S2 line is a significant infrastructure project aimed at enhancing connectivity between Wuxi and Yixing, facilitating a "half-hour commuting circle" and promoting regional integration in the Yangtze River Delta [2][7]. Group 1: Project Overview - The Xiyi S2 line spans approximately 61.48 kilometers with a design speed of 160 km/h and includes 9 stations (7 underground and 2 elevated) [2]. - Currently, 5 stations are under main structure construction, while 2 stations are in the protective structure phase, and the remaining stations are expediting preliminary procedures [2]. Group 2: Technical Details - The project features a critical segment that involves a 21.6-kilometer tunnel crossing Taihu Lake, utilizing 4 large-diameter shield machines for excavation [2]. - The "Xiwang" shield machine has a maximum excavation diameter of 14.08 meters and will handle approximately 5.5 kilometers of tunnel construction with a maximum cover depth of 30.86 meters [4]. - The "Xiyi" shield machine has an excavation diameter of 14.02 meters and will undertake about 7.6 kilometers of tunneling with a maximum depth of 34.88 meters [6]. Group 3: Innovation and Challenges - The construction team faces stringent challenges, including ecological protection and complex geological conditions, necessitating advanced technology for ground settlement control and pollution prevention [6]. - Innovations include intelligent geological prediction systems and a fourth-generation dual-liquid grouting system to enhance tunnel quality and efficiency while ensuring environmental safety [6]. Group 4: Future Impact - Upon completion, the Xiyi S2 line will connect major transportation hubs and tourist attractions, significantly improving commuting times and distances between Wuxi and Yixing [7]. - The project aims to integrate with existing rail systems, further promoting the regional integration of Wuxi into the national development framework of the Yangtze River Delta [7].