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Please use this identifier to cite or link to this item: http://hdl.handle.net/2080/404

Title: Prediction of Overbreak in Underground Tunnel Blasting: A Case Study
Authors: Murthy, V M S R
Dey, K
Raitani, 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 wat...
Description: Copyright for this article belongs to publisher
URI: http://hdl.handle.net/2080/404
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