Study on influence of microcrack distributed in granite at deep depth

Sato, Toshinori  ; Kuwabara, Kazumichi; Takayama, Yusuke  ; Tanno, Takeo*; Itamoto, Masaharu*; Kato, Harumi*

This paper shows the results of in-situ stress measurement, uniaxial load and unload test, P-wave velocity measurement at the Mizunami Underground Research Laboratory. As the results of these measurements, microcrack distributed in Granite at deep depth influences physical and mechanical properties of rock and in-situ stress state.