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Volume 49 (2008 - 200･･･
- Issue 6 Pages 318-
- Issue 5 Pages 256-
- Issue 4 Pages 204-
- Issue 3 Pages 126-
- Issue 2 Pages 64-
- Issue 1 Pages 2-
Volume 49, Issue 5
Displaying 1-5 of 5 articles from this issue
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Hidekazu YOSHIDA, Shoji NISHIMOTO, Akio CHO, Koshi YAMAMOTO, Nagayoshi ...2008 Volume 49 Issue 5 Pages 256-265
Published: December 10, 2008
Released on J-STAGE: November 04, 2011
JOURNAL FREE ACCESSIn order to understand the alteration process in subsurface granitic rocks, drilled core (100 meters deep) taken from Mesozoic granitic rock distributed in the Chugoku area of Japan has been investigated. The rock is characterized by the coarse size of rock-forming minerals such as quartz, plagioclase, orthoclase and biotite. The borehole logging and core observations show that there are several fractured zones, and almost all these structural features are associated with alteration zones that have been formed by water-rock interaction. The studied samples were collected from the altered zone at the location of 40 to 50 meters below the ground surface. Detailed analysis of the pore geometry, mineralogical observation and geochemical analysis were carried out to reveal the changes of textual and geochemical characteristics due to water-rock interaction. Alteration feature of rock-forming minerals such as plagioclase and biotite shows that the granitic body has two stages of thermal and water-rock interactions. One is the high-temperature hydrothermal alteration after the magma solidification, and the other is relatively low-temperature alteration probably due to groundwater circulation after the being exposed at the surface. This kind of methodology used for rock forming minerals of subsurface granitic rock can be applied to understand the alteration history due to the water-rock interactions during the formation of granitic body.View full abstractDownload PDF (4063K) -
Hyuck PARK, Masahiko OSADA, Kunio WATANABE2008 Volume 49 Issue 5 Pages 266-276
Published: December 10, 2008
Released on J-STAGE: November 04, 2011
JOURNAL FREE ACCESSA new type of shear-flow-visualization coupling test apparatus was developed to investigate the hydraulic conductivity alteration and fracturing process of intact soft sedimentary rock (pumice tuff) during shear deformation. The design of new apparatus allows both direct shear test and hydraulic conductivity test to be carried out at the same time. In addition, it is possible to observe the specimen surface during experiment. Shear/normal stress, volumetric flow rate and deformation (shear/normal displacements) can be obtained directly. Area of visible fractures and local normal displacement of fractured specimen were obtained by the image processing technique. With these obtained values, especially, the area of visible fractures and the local normal displacement of fracture revealed the advantage of new apparatus for the shear-flow coupling. This study shows one of new directions on the shear-flow coupling experiment of rock.View full abstractDownload PDF (3273K) -
Kazushi MORI, Kouta IIZUKA2008 Volume 49 Issue 5 Pages 277-284
Published: December 10, 2008
Released on J-STAGE: November 04, 2011
JOURNAL FREE ACCESSIn recent years, slug test is used worldwide for estimating ground permeability easily and economically. Expecting that this method will become more popular in Japan, we have conducted many slug tests to examine its utility and methods of analysis. Especially, ways and effectiveness of noise reduction and borehole development are presented with field examples.View full abstractDownload PDF (1539K) -
Yuji KANAORI2008 Volume 49 Issue 5 Pages 285-292
Published: December 10, 2008
Released on J-STAGE: November 04, 2011
JOURNAL FREE ACCESS -
An Example from Usu Volcano, Hokkaido, JapanAkito NAKASUJI2008 Volume 49 Issue 5 Pages 293-303
Published: December 10, 2008
Released on J-STAGE: November 04, 2011
JOURNAL FREE ACCESS
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