Question

Which one of the following statements is not correct for heading and benching method of tunnelling ?

A.Drilling and mucking can be done simultaneously
B.Benching provides a plateform for working on heading
C.Removal of muck from the heading is very easy
D.None of these.​

Answer 1

Answer:

Option C is the correct answer Bro !

Answer 2

Answer:

(C)Removal of muck from the heading is very easy

Explanation:-

In large tunnels and when the quality of the rock is not satisfactory, heading and benching method is often used. This method involves the driving the top portion of the tunnel in advance of the bottom portion. The lining of roof arch can then be constructed first by using the bottom bench as temporary supports.

Method of Tunneling-

1. Cut-and-cover tunnel, constructed in a shallow trench and then covered over. Bored tunnel, constructed in situ, without removing the ground above.

2. Immersed tube tunnel, sunk into a body of water and laid on or buried just under its bed.

For more refers to-

https://brainly.in/question/5653210?referrer=searchResults

https://brainly.in/question/7773211?referrer=searchResults

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