Q70
What was a geological advantage in building the Channel Tunnel between UK and France?
A.
Soft unconsolidated sands
B.
High groundwater flow
C.
Chalk marl strata
AnswerD.
Basaltic lava flows
Answer: Option C
Solution
Answer: Option C
Solution:
The tunnel was bored through Chalk Marl, which provided good strength, low permeability, and predictable conditions, ideal for long tunneling.