The correct sequence of these operations in tunnel construction is:
- Drilling
- Blasting
- Mucking
- Placing steel
- Placing concrete
Drilling is the first step in tunnel construction. The purpose of drilling is to create a hole in the ground that can be used for the tunnel. The type of drill used will depend on the type of ground that is being drilled through.
Blasting is the second step in tunnel construction. The purpose of blasting is to break up the rock or soil that has been drilled. The type of explosive used will depend on the type of ground that is being blasted through.
Mucking is the third step in tunnel construction. The purpose of mucking is to remove the rock or soil that has been blasted. The muck is usually removed by a mucking machine.
Placing steel is the fourth step in tunnel construction. The purpose of placing steel is to provide support for the tunnel. The type of steel used will depend on the type of ground that is being tunneled through.
Placing concrete is the fifth and final step in tunnel construction. The purpose of placing concrete is to provide a watertight and durable lining for the tunnel. The type of concrete used will depend on the type of ground that is being tunneled through.
It is important to note that the sequence of these operations may vary depending on the specific tunnel being constructed. However, this is the general sequence of operations that is followed in most tunnel construction projects.