To improve the surrounding soil layer at the junction of the scheduled opening and tunnel, and to overcome the proximity of TBM drilling and shallow soil drilling and tunneling, site strength and water resistance.
The scope of work was to improve the grouting of the initial part of the TBM launching part of the shaft, the shallow soil cross section and the connecting passageway.
In this work, Double-Packer grouting was used to inject the CB grout and sodium silicate chemical grout into the site to improve strength and water tightness.