Q135
What engineering control was implemented in the Aizu Tunnel to manage gas emissions?
A.
Ventilation boreholes
AnswerB.
Ground freezing
C.
Bentonite lining
D.
Reinforced concrete vaults
Answer: Option A
Solution
Answer: Option A
Solution:
The tunnel passed through gas-bearing formations, so ventilation boreholes were installed to manage potentially explosive methane gases.