Abstract:

The monitoring of tunnel surrounding convergence and arch crown settlement is the key to safe construction of tunnel, surrounding rock supporting effect estimation, secondary lining time determination and design and construction of dynamic informationization of tunnel. The monitoring accuracy of tunnel surrounding convergence and arch crown settlement in [WTBX]JTG F60—2009 Technical Specifications for Construction of Highway Tunnel[WT] is 0.1 mm, which is larger than that in criterions for railways and foundations [JP3](0.5-1.0 mm). In this paper, the monitoring items and requirements in criterions for highway tunnels and railway tunnels are summarized; and then the authors suggest that the monitoring accuracy of tunnel surrounding convergence and arch crown settlement of highway tunnels should be 0.5-1.0 mm according to existing monitoring devices, design reserved deformation, monitoring results and related foundation monitoring requirements. The suggested value of monitoring accuracy of tunnel surrounding convergence and arch crown settlement of highway tunnel can guarantee the safe construction of tunnel, so as to promote the application and popularization of noncontact monitoring method and device (highaccuracy total station) and improve the monitoring efficiency of tunnel deformation.

Key words: highway tunnel, deformation monitoring, tunnel surrounding convergence, arch crown settlement, monitoring accuracy