A Study on material properties of diatomacious madstone with changing water content

Maekawa, Keisuke; Osada, Masahiko*

Dai-41-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koenshu (CD-ROM), p.53 - 58, 2012/01

It has been known that the rock material properties would be different from the condition before excavation due to air-ventilation into the shaft. The phenomena would be significant to assess a long-term geological disposal safety. But any methodologies to understand the effect have not been established yet. This paper shows the results of rock tests for engineering properties including drying-induced deformation experiment as one part of establishing research and assessment methodologies of the sedimentary rock material properties. As a result we show the tendency of drying-induced deformation of diatomaceous mudstone and the significant points of rock tests for engineering properties.

A study on Geological Modeling for Fractured Rock (2)

Osada, Masahiko*; Watanabe, Kunio*

JNC TJ7400 2005-025, 203 Pages, 2003/03

JNC-TJ7400-2005-025.pdf:18.42MB

The purpose of this study is to develop how to model the fractures that act as the major conduits of groundwater.

Method for characterizing fractures and water-conducting features in different scales, 1

Takeuchi, Shinji; Saegusa, Hiromitsu; Shiozaki, Isao*; Hosoya, Shinichi*; Osada, Masahiko*

no journal, , 

no abstracts in English

A Study on drying-induced deformation of sedimentary rock, 1; A Study on relation mechanical anisotropy between elastic wave velocity for sedimentary rock

Tada, Hiroyuki*; Saito, Akira*; Kumasaka, Hiroo*; Osada, Masahiko*; Takemura, Takato*; Maekawa, Keisuke

no journal, , 

no abstracts in English

Drying-induced deformation of sedimentary rock, 3; The Relation between pore structure and drying-induced deformation of sedimentary rock

Maekawa, Keisuke; Tada, Hiroyuki*; Saito, Akira*; Kumasaka, Hiroo*; Osada, Masahiko*; Takemura, Takato*

no journal, , 

no abstracts in English