The Relationships among brittleness, deformation behavior, and transport properties in mudstones; An Example from the Horonobe Underground Research Laboratory, Japan

Ishii, Eiichi  ; Sanada, Hiroyuki; Funaki, Hironori ; Sugita, Yutaka ; Kurikami, Hiroshi 

This paper addresses relationship among brittleness, deformation behavior, and transport properties of mudstones at the Horonobe Underground Research Laboratory site, Japan. The mudstones include indurated/cemented rocks by silica diagenesis. The geological, mechanical and hydrogeological data were systematically interpreted using a brittleness index (BRI) concept which is defined using unconfined compressive strength and the unconfined compressive strength of a normally consolidated rock in non-overpressured domains.