Abstract:

The doubleshield TBM applied in urban metro construction is always accompanied by difficulties such as difficult launching, limited small radius, crossing extremelyhard rock and fault and fracture zone. Hence, the problems and countermeasures for doubleshield TBM applied in Shenzhen Metro construction are studied. Four aspects are proposed as follow: (1) Cutting tool wear and consumption rules, advancing control measures and solution of measuring platform vibration in the construction of doubleshield TBM with limited small turning radius about 260 m; (2) a separate launching technical scheme solving the problem of limited space; (3) targeted design of doubleshield TBM and improvements for cutting tool under 210 MPa extremelyhard rock condition; (4) tunneling parameters and countermeasures for doubleshield TBM crossing fault fracture zone.

Key words: metro, doubleshield TBM, limited small radius construction, separate launching, fault fracture zone, extremelyhard rock