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Managing blast vibration whilst increasing tunnel advance rates

Case Study



Toyota City is located in north-central Aichi Prefecture, Japan. 
With some low lying areas of Toyota City prone to flooding, Kajima Corporation were contracted to excavate the Anei River tunnel to increase drainage capacity. With granite rock too hard for excavation, blasting was the obvious solution however, the tunnel ran directly beneath a residential area.
Orica proposed the use of the eDev™ II Electronic Blasting System combined with Orica’s SHOTPlus™ T software for design, modelling and vibration analysis. The Multi Deck Blasting technique was also used to allow Kajima to blast through the most sensitive areas of the project with half the amount of blasts that might have been required using the conventional blasting technique, minimizing delays to both neighbours and construction activities, wiping months off the project’s critical path.


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Case Study- Managing Blast Vibration whilst Increasing Tunnel Advance Rates English download
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