AL Tunnel Practice Questions - Alabama Tunnel Contractor Examination Exam

What lining is typically erected immediately behind a shielded TBM in soft ground?

Only timber sets with no rings Unreinforced brick laid from the surface A poured invert placed before the TBM is launched Precast concrete segmental rings, often with gaskets for watertightness

Correct Answer:

Precast concrete segmental rings, often with gaskets for watertightness

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