广湛铁路湛江湾海底隧道设计方案研究

Research on the Design of Zhanjiang Bay Undersea Tunnel of Guangzhou-Zhanjiang High-speed Railway

广湛铁路湛江湾海底隧道具有大直径(13.8 m,开挖直径>14 m)、高水压(0.59 MPa)、地层条件差(第四系地层厚)、盾构掘进距离长(5853m,独头掘进)、行车速度高(250 km/h)等特点,其设计难度大、关键技术多,国内外可供参考的经验少。本文从隧道施工工法、分合修方案、盾构机选型与适应性等方面进行对比分析,得出适用于该隧道施工的推荐方案,同时对本工程总体设计进行阐述,可为同类跨江越海工程的设计提供参考与借鉴。

The Zhanjiang Bay undersea tunnel of Guangzhou-Zhanjiang high-speed railway is characterized by large diameter(13.8 m,the excavation diameter>14 m),high water pressure(0.59 MPa),poor stratum conditions(the thick quaternary strata),long distance of shield tunneling(5853 m,blind heading),high speed(250 km/h),etc.Its design is very difficult,and needs many key technologies.There are few domestic and foreign experience for reference.This paper made a comparative analysis of the tunnel construction methods,the separated and comb ined construction schemes,the selection and adaptability of shield machines,etc.,and obtains the recommended scheme applicable to the tunnel construction.Meanwhile,the overall design of the project is described,which can provide some reference for the design of future similar projects.