Q98
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
AnswerAnswer: Option D
Solution
Answer: Option D
Solution:
The collapse was caused by the failure of diaphragm walls during subway construction, allowing water and soil to enter the excavation site rapidly.