Abstract:

Using slurry TBM to excavate rock tunnels is not a common practice in Taiwan. An actual tunnel project excavated by using slurry TBM is introduced in this paper. The TBM selection considerations, machine characteristics, construction risks and treatments of the project are described in detail. Although risk may still occur, these experiences show that the severe wearing of the disc cutter, the blocking of the slurry discharge pipe and the sustained convergence of rock mass and C/W ratio are to blame for the slow progress of TBM construction. This construction practice can provide reference for the rock tunnel excavated by TBM in future.

Key words: slurry TBM, rock tunnel, slow progress