Q105
In the Niagara Tunnel Project, what was a geotechnical challenge?
A.
Frozen soil
B.
Highly fractured Queenston shale
AnswerC.
Glacial erratics
D.
Artesian pressure
Answer: Option B
Solution
Answer: Option B
Solution:
The tunnel passed through highly fractured Queenston shale, which is known to swell and weaken on exposure to water, demanding fast excavation and lining.