Abstract
In tunneling using shields with rectangular cross sections (box shield tunneling method), it is important and necessary to ensure the backfill grouting of the rectangula-shaped tail void to put the method to practical use. In this study, grouting performance was investigated through tests using a full-scale model. The basic characteristics of hardened backfill materials were also examined through a series of tests to propose different mix proportions. Based on the results of the above tests, simultaneous grouting was carried out during experimental tunneling to investigate the state of ground deformation and grouting thickness. The above mesurements proved that the successful backfill grouting of the rectangular-shaped tail void was possible.
