活断層調査坑道における初期応力測定

In-Situ Rock Stress Measurement in the Active Fault Survey Tunnel

武部 晃充*; 東原 雅実*; 高見 明*

Takebe, Akimitsu*; Higashihara, Masami*; Takami, Akira*

地質環境の長期的な変化を予測するために,活断層の深部構造と断層破砕帯の性質及び断層近傍の応力状態の調査を進めている。その一環として,神岡鉱山の活断層調査坑道において,活断層周辺岩盤の初期応力を水圧破砕法により測定を試みた。

The comprehensive studies are being carried out for the deep structure of the active fault, characteristics of the fault fracture zone and stress states of the rock nearby the fault. As one of them, an in-situ rock stress measurement by hydrofracturing method was attempted on a nearby active fault in the survey tunnel at Kamioka Mine. This report describes the hydrofracturing method and results of the in-situ rock stress measurement.