抄録
At penstock construction (sectional area 17m2, length 140m and 48 degrees) in Omarugawa power station, we construct it by enlargement excavation used blasting after pilot excavation by Raise Borer method (2.44m-diameter). In the case of its system, it is important to obtain information about geological state at pilot excavation. Then, we grasp summarily rock mass state at inclined shaft, and try to guess support pattern by analyzing excavation data by Raise Borer. And further, we verify its technique by seismic prospecting
