Tunnel Engineering
What is the correct sequence of the following events of construction of a shaft in rock?1.Drilling and blasting2.Timbering3.Pumping4.MuckingSelect the correct answer using the codes given below Codes:
- A. 1, 2, 3, 4
- B. 1, 4, 2, 3
- C. 2, 1, 4, 3
- D. 2, 4, 1, 3