Question: A rectangular tunnel is driven horizontally in a Northerly direction. Where would you expect to see failure in the tunnel if the principal stresses are

A rectangular tunnel is driven horizontally in a Northerly direction. Where would you expect to see
failure in the tunnel if the principal stresses are oriented:
1: North West
2: North East
3: Vertical
Select one:
a. In the tunnel roof on the eastern side of the tunnel
b. At the top of the eastern tunnel wall
c. In the tunnel roof on the western side of the tunnel
d. At the bottom of the eastern tunnel wall
A rectangular tunnel is driven horizontally in a

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