Drilling, Blasting and Mucking

Authored by: S. Ponnuswamy , D. Johnson Victor

Transportation Tunnels

Print publication date:  May  2016
Online publication date:  June  2016

Print ISBN: 9781138029811
eBook ISBN: 9781498785488
Adobe ISBN:

10.1201/b21639-8

 Download Chapter

 

Abstract

Blasting is resorted to while dealing with hard rock and soft rock of compact nature. Special care has to be taken while blasting. The blasting operation has to cover just the profile and the tunnel has to advance progressively. It has to be done in such a way as to minimise shock, vibration and any other disturbance to the rock structure around the profile of the tunnel. It should be such as to ensure minimum ‘overbreak’, i.e., the extra section over and above the minimum section required to be removed (see Figure 7.1). This is particularly important when the tunnel is to be lined. Otherwise, extra lining material, an expensive item, will have to be used. The basic principle is to loosen the volume of virgin rock in such a way that when it is removed, the length of the tunnel has advanced in the correct direction, and conforming as nearly as possible to the correct cross-section.

 Cite
Search for more...
Back to top

Use of cookies on this website

We are using cookies to provide statistics that help us give you the best experience of our site. You can find out more in our Privacy Policy. By continuing to use the site you are agreeing to our use of cookies.