Q.

Which of the following can act as an alternative for blasting?

A. tunneling
B. continuous blasting
C. sequential blasting
D. fire-setting
Answer» D. fire-setting
Explanation: blasting is the conventional method which is adopted in case of rock tunneling. in the case of fire-setting, tunnel is heated with fire and then cooled with water. rapid expansion and contraction weakens and rock and tends to break.
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