Which of the following lining material is useful for shield driven tunnels in sub aqueous regions ?

Which of the following lining material is useful for shield driven tun

1.	Which of the following lining material is useful for shield driven tunnels in sub aqueous regions ?
A.	stone masonry
B.	timber
C.	cast iron
D.	cement concrete
Answer» D. cement concrete

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Which of the following lining material is useful for shield driven tunnels in sub aqueous regions ?

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