Abstract:

Due to the great construction difficulties and high quality requirements of the works, internationallyadvanced shield machines and technologies were introduced to the works and key matching technologies were developed for the works. In the end, the traditional technical problems occurring during the past shieldbored tunnel construction were effectively resolved and a running tunnel with the highest quality in respect of structures, waterproofing and appearance on line 2 of Guangzhou Metro was built. In the paper, the contents and applications of the new construction technologies ( i.e., 1.5m wide segment, EPDM elastic water stops, SLST guidance system, simultaneous grouting and shield type selection) used in the works are described and analysis is made on the economic and social efficiency resulted by the application of the new construction technologies.

Key words: Metro tunnel  tunne, construction by shield machine, new technology, wide segment, EPDM elastic water stop, SLS-T guidance system, simultaneous grouting, shield type selection, application