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|Title: ||Prediction of Overbreak in Underground Tunnel Blasting: A Case Study|
|Authors: ||Murthy, V M S R|
|Issue Date: ||2003 |
|Publisher: ||Canadian Tunnelling Association|
|Citation: ||Journal of Canadian Tunelling Canadien, P 109-115|
|Abstract: ||Tunnels are required to be constructed for meeting different human needs such as power
generation, transpo rtation, underground storage, sewages etc. Irrespective of the purpose for which the tunnels
are driven, all are plagued by overbreak problems. Tunnels driven for water conveyance, in hydroelectric
projects, in particular, need to be excavated with minimum overbreak so that the cost of permanent concrete
lining is kept to minimum.
Predicting overbreak assumes significant importance to design site-specific blasts for minimizing the same. This
paper presents a brief review of existing peak particle velocity (PPV) based overbreak estimation models and
discusses the influence of PPV on overbreak in a lake tap horizontal tunnel of Koyna Hydro-electric Project,
India. Koyna Lake Tap Tunnel is a water feeder tunnel for a fully underground hydroelectric power project.
The tunnel had to be driven through hard compact basalt under a shallow cover of 15m beneath a fully charged
|Description: ||Copyright for this article belongs to publisher|
|Appears in Collections:||Journal Articles|
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