What is the cut and cover technique?

Cut-and-cover is the oldest method of tunneling. The basic concept involves the digging of a trench, the construction of a tunnel, and then returning the surface to its original state. As such, it is a disruptive technique, but it is also usually the most economical construction method.

How do you build a cut and cover tunnel?

Starts here0:45How to build a cut-and-cover tunnel – YouTubeYouTubeStart of suggested clipEnd of suggested clip41 second suggested clipSometimes called secant’s or columns. Which are filled with concrete and reinforcing steel theseMoreSometimes called secant’s or columns. Which are filled with concrete and reinforcing steel these columns become the tunnel walls.

What are the types of tunnels?

There are three basic types of tunnel construction in common use: Cut-and-cover tunnel, constructed in a shallow trench and then covered over; Bored tunnel, constructed in situ, without removing the ground above. There are also Conveyance Tunnels and Traffic Tunnels.

What is drift method of tunneling?

Drift Method: In this method after driving the drift, the drill holes are drilled all round the drift in the entire cross section of the tunnel, filled with explosives and ignited. The rock shatters, the muck removed and the tunnel expanded to the full cross section.

What is cut and cover method in tunneling?

The cut and cover method is a traditional form of tunneling that involves opening up the ground surface and excavating to the required depth. Once the construction is complete, the excavation is backfilled. The method is used when excavation is possible and economical from the surface, and environmentally acceptable.

What is open cut construction?

Open cut trench excavation is the traditional and most popular method for sewer lateral sewer construction, repair, or replacement. The open cut trench method involves excavating down to and exposing the existing pipe so that it can be repaired or replaced and then backfilled.

What is tunnel PDF?

Objectives: Tunnels are underground passages used for transportation. They could be used for carrying freights and passengers, water, sewage, etc Tunnels are more economical than open cuts beyond certain depths. Tunnels avoid disturbing or interfering with surface life and traffic during construction.

What is tunnel explain?

A tunnel is an underground passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. Tunnels can be connected together in tunnel networks.

What is heading and benching method of tunneling?

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.

What is benching heading?

Heading-and-bench construction. A tunnelling method in which a top heading is excavated, followed (within one to a few blasts or shoves ) by excavation of the lower bench .

What is tunnel mining?

Underground mining Underground mining is used to extract ore from below the surface of the earth safely, economically and with as little waste as possible. The entry from the surface to an underground mine may be through a horizontal or vertical tunnel, known as an adit, shaft or decline.

What is tunnel and open cut?

Definition. Open-cut tunnel. A tunnel constructed by excavating a trench from the surface, building the structure within the trench, and then backfilling to restore the surface.

What is the meaning of cut and cover construction?

a method for digging a tunnel, laying pipe, etc., by cutting a trench, constructing the tunnel or laying the pipe in it, and covering with the excavated material. Nearby words. Origin of cut-and-cover.

What is the cut and cover method?

Cut and cover method can be of two types: bottom-up method and top-down method. In the bottom-up method (figure A), the site is first excavated and proper ground support is provided. The tunnel is then constructed of precast concrete, in-situ concrete, steel rings, etc.

What is cut and cover tunneling?

The cut and cover method is a traditional form of tunneling that involves opening up the ground surface and excavating to the required depth. Once the construction is complete, the excavation is backfilled. The method is used when excavation is possible and economical from the surface, and environmentally acceptable.