山岳トンネル (5)

5:30 PM - 5:40 PM JST(8:30 AM - 8:40 AM UTC)

[VI-378] Outbreak Reduction Effects of Presplitting in Rock with Many Cracks

*Hajime Hamada¹, Mitsuyoshi Tokunaga², Ryohei Miura³ (1. Okumura Corporation Technical Research Institute, 2. Okumura Corporation Tohoku Branch, 3. Okumura Corporation Nagoya Branch)

Keywords:

Mountain Tunnel,Cautious Blasting,Presplitting,Guide Hole,Outbreak,Smoothing

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