Abstract
Controlled blasting is necessary to restraining ground shake. To reduce the quantity of explosive or to use the one that has slow explosive speed is the effective measure for controlled blasting. We need select the most effective one to consider around conditions.
This time we constructed the road tunnel close by other water-tunnel about 17 meters apart, that was constructed 50 years ago. As controlled blasting we adopted the effective measures, a pilot tunnel by TBM and blasting with electronic delay detonator. The pilot tunnel is effective to reduce explosive shaking energy and the detonator is valid to disperse vibration waves with blasting.
In this report we describe about the result of these measures as controlled blasting.
