Which one of the following statements is not correct with regard to heading and hunching method of tunnelling.

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Which one of the following statements is not correct with regard to heading and hunching method of tunnelling.

1.Firing of head holes is done just before the bench holes are fired

2.The holes in head and bench are loaded together with explosive for blasting

3.After driving the top portion 3 m to 3.5 m holes are drilled into the head and bench

4. Driving the top portion is done in advance of the bottom portion

Posted Date:-2022-09-24 23:59:21

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  58. Which one of the following statements is not correct for heading and benching method of tunnelling?
  59. Which one of the following statements is not correct with regard to heading and hunching method of tunnelling.
  60. Which one of the following tunneling methods is used for laying underground sewers?
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