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Geologically, how many classes of tunnels are recognized?

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Geologically, how many classes of tunnels are recognized?

(a) 2

(b) 3

(c) 5

(d) 4

The question was posed to me in a national level competition.

This intriguing question comes from Tunnels and Their Types in portion Tunnels of Engineering Geology

1 Answer

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The correct option is (a) 2

To explain I would say: Geologically speaking, only two classes of tunnels are recognized: tunnels driven through rocks (rock tunnelling) and tunnels driven through soil, loose sediments or saturated ground (soft-ground tunnelling).

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