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http://hdl.handle.net/2080/407
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| Title: | Development of Predictive Models for controlling Blast Induced Overbreak in Tunnels |
| Authors: | Murthy, V M S R
Dey, K |
| Issue Date: | 2004 |
| Publisher: | Indian Society of Rock Mechanics and Tunneling |
| Citation: | Journal of Rock Mechnanics and Tunneling Technology, Vol 10, No 1, P 31-47 |
| Abstract: | Drilling and blasting continues to be the predominant rock excavation
technique in driving horizontal openings and tunnels for underground
construction purpose. Faster drivages, attempted these days for reducing the
long gestation periods of projects, have often resulted in large overbreak. This
is due to the unacceptable levels of ground vibration to which the rock is
subjected. Factors contributing to this include longer pulls; burn cuts, higher
explosive per hole and per delay etc. Blast-induced rock damage (BIRD)
assessment based on far-field peak particle velocity (PPV) measurement, when
extrapolated near the face, has often resulted in suggesting higher PPV
threshold levels. Apart from this the geological and structural features play a
dominant role in masking the intensity of blast waves. Therefore, near-filed
monitoring using accelerometers has been attempted in one of the metal mines
to study the blast damage in faces excavated by burn cut. Present
seismographs av... |
| Description: | copyright for this article belongs to the publishers |
| URI: | http://hdl.handle.net/2080/407 |
| Appears in Collections: | Journal Articles
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