Examveda

The 2009 Cologne Archive collapse was linked to:

A. Groundwater rise

B. Improper excavation near soft rock

C. TBM misalignment

D. Failure of diaphragm walls

Answer: Option D

Solution (By Examveda Team)

The collapse was caused by the failure of diaphragm walls during subway construction, allowing water and soil to enter the excavation site rapidly.

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