山岳トンネル(1)

[VI-401] Proximity construction of headrace tunnel 2.3m from existing tunnel at minimum distance

〇Tomonori Ono¹, Hiroaki Ozawa², Hiroyuki Misawa¹, Keigo Koide¹, Hikaru Takada¹ (1.SATO KOGYO CO.,LTD., 2.TEPCO Renewable Power, Incorporated)

Keywords:proximity, controlled blasting, non-explosive crushing agent, vibration velocity, K value, slot drilling method