Influence of Clogging on the Muck Transport in Shield Machines

摘要

Shield drives in fine-grained clayey soil are frequently affected by clogging. Walls of clogged material represent a special form of this particular obstacle. Such walls can attain a high degree of strength and develop directly in the TBM's material flow.The fact that these walls of clogged material exacerbate or even interrupt the direct path of the excavated material from the rear side of the cutting wheel to the follow-up conveying system makes driving especially difficult (Fig. 1).