Abstract:

The tunnel boring machine（TBM） is jammed when boring in fault and fracture zones of a waterdiversion project. In order to release the TBM safely and rapidly, a series of technologies, i.e. strengthening the support of constructed sections, reinforcing the area ahead the tunneling face and the upper shield of TBM, reinforcing the surrounding rocks ahead the cutterhead by means of chemical grouting method, advance supporting and reinforcing the upper shield by means of pipe roof method and clearing the muck on the cutterhead, are adopted. Finally, the TMB is successfully released after 205 days.

Key words: waterdiversion tunnel, opentype TBM, fault and fracture zone, chemical grouting, pipe roof, mucking, jam releasing