Convergency compatible support systems

摘要

Convergency compatible support systems are well established in conventional tunnelling. Solutions for convergency compatible systems in tunnels driven by shielded TBMs with subsequent segmental lining are still under development.One solution - the installation of deformable elements in the longitudinal joints - is unlikely to make its way from use in conventional tunnelling into mechanised tunnelling.Of the two other remaining solutions -ribbed segment with recess, or compressible filling of the annular gap -the latter is the more promising one. Its application will facilitate tunnel driving by TBM through sections of squeezing rock.