Q62
In the Gotthard Base Tunnel, what major geological obstacle was encountered?
A.
Aquifers in limestone
B.
High geothermal gradients
AnswerC.
Weak unconsolidated sand
D.
Reactive clay minerals
Answer: Option B
Solution
Answer: Option B
Solution:
The Gotthard Base Tunnel in Switzerland, the world�s longest rail tunnel, faced high geothermal gradients exceeding 40�C, requiring special cooling and ventilation systems.