Journal of the Japan Society of Engineering Geology
Online ISSN : 1884-0973
Print ISSN : 0286-7737
ISSN-L : 0286-7737
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Volume 38, Issue 5
Displaying 1-8 of 8 articles from this issue
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  • Acidification of Reservoir and Leaching of Aluminum by Oxidation-reduction Reactions of Pyrite
    Toshifumi IGARASHI, Takahiro OYAMA
    1997 Volume 38 Issue 5 Pages 244-251
    Published: December 10, 1997
    Released on J-STAGE: June 04, 2010
    DOIhttps://doi.org/10.5110/jjseg.38.244
    JOURNAL FREE ACCESS
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    Water quality in a reservoir was investigated to identify the causes of acidification of the reservoir water and the change in the water color to light blue. The results showed that the sulfate concentration was high at the sampling points in the reservoir where the pH was low, and that there was sufficient dissolved oxygen to keep the redox condition in the reservoir aerobic. A small plot of land reclaimed by using excavated rocks which contained considerable quantities of pyrite was constructed in the center of the reservoir, suggesting that the acidification of the reservoir was caused by the oxidation-reduction reaction of pyrite, to produce sulfate and hydrogen ions.
    Soluble aluminum concentration only corresponded to the pH of the reservoir water in spite of the sampling points. The geochemical evaluation by the commonly used geochemical model PHREEQE showed that an aluminum hydroxide, gibbsite, was in equilibrium with the precipitation-dissolution reaction. This suggests that the acidified reservoir water leached aluminum from the surrounding soils, rocks and suspended solids, and that the precipitation-dissolution reaction of gibbsite occurred. It is thought that the reservoir looked light blue due to the white precipitate of the formed aluminum hydroxide.
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  • Consideration of Deep Sedimentary Conglomerate Properties by Taking Notice of the Calcite Content
    Satoru KAWASAKI, Kameichiro NAKAGAWA, Yoshitake ETO, Akito NOZAKI, Kaz ...
    1997 Volume 38 Issue 5 Pages 252-264
    Published: December 10, 1997
    Released on J-STAGE: June 04, 2010
    DOIhttps://doi.org/10.5110/jjseg.38.252
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    To investigate deep conglomerate properties, a deep boring of the depth of 600 m and a series of laboratory rock tests were performed. And we especially took notice of the calcite content considered a large influence on mechanical properties of conglomerate. A quantity measuring of the calcite content was tried to research relationships between the calcite content and mechanical properties of conglomerate. These results led to the conclusion that it was clear that laboratory test results of deep sedimentary conglomerate were able to be evaluated by considering the calcite content and the influence of looseness by stress release on conglomerate core samples.
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  • Landslide Processes during Earthquakes in the “Green Tuff” Area in the Tohoku District
    The Rikuu Earthquake and Senboku Earthquake in Akita Prefecture
    Shinro ABE, Akihisa TAKAHASHI
    1997 Volume 38 Issue 5 Pages 265-279
    Published: December 10, 1997
    Released on J-STAGE: June 04, 2010
    DOIhttps://doi.org/10.5110/jjseg.38.265
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    In January in 1995, the Hyougo-ken Nanbu Earth-quake occurred. This earthquake caused many landslides, especially in areas of granite and decomposed granite.
    There are some large landslides in the “Green Tuff” areas in the Tohoku district. Accordingly, once a large earthquake occurs in the future, many landslides may move in these areas.
    Therefore, it is necessary to examine landslide processes during earthquakes in these areas, using data from previous earthquakes as a basis.
    In 1896 the Rikuu Earthquake occurred, followed in 1914 by the Senboku Earthquake. Both of these occurred in the central part of the Akita pre-fecture.
    These earthquakes caused some landslides, which damaged many houses and injured many people.
    Landslides occurred especially in areas with the severe vibration (the tremor of the 6th degree or more on the seismic scale). In the areas of “green tuff” of the early and middle Miocene distributed, landslides known as “collapse type” occurred. Also, in the areas of sandstone and mudstone of the Pliocene, landslides known as “rock slide type” occurred. This type is judged to be the “original landslide”.
    We examined data from these earthquakes and conditions in the disaster areas. As a result, the type of the slope movement caused by the earthquake in Green Tuff region in the Tohoku district is clarified.
    That is, in the case of the earthquake of which seismic scale is the 6th degree, many slope failures can occur, while in the case of the earthquake of the 6th or 7th degree, many original landslides of a rock-slide type can occur along the bedding plane on the ridge of a mountain.
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  • Geotechnology and Sedimentary Environment of Holocene Deposits in the Matsue plains
    Takeshi KAMEI, Takao TOKUOKA, Yoshikazu SAMPEI, Hirokazu ISHIHARA
    1997 Volume 38 Issue 5 Pages 280-295
    Published: December 10, 1997
    Released on J-STAGE: June 04, 2010
    DOIhttps://doi.org/10.5110/jjseg.38.280
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    Sulfur, organic carbon and nitrogen relationships in modern sediments have been used to characterize depositional environments. The sulfur and organic carbon relationship could be a useful indicator for depositional environments, since the biogeochemical cycle of sulfur in sediments is inseparable from that of carbon, and the relationship depends on the depositional environment. The relationship between organic carbon and pyrite sulfur concentration in sediments from several different depositional environments, namely normal marine, non-marine freshwater and euxinic sediments have been investigated. In summary, an integrated approach combining geological histories, geochemistry (sulfur, nitrogen and organic carbon concentration) and geotechnical engineering characteristics have been utilized to evaluate the depositional environments on the Matsue plains.
    To this end, a simple geochemical relationships (sulfur, nitrogen and organic carbon concentration) to investigate sediments from a new perspective are described. The proposed systematics can probably be refined with additional data, however, the principles outlined in this study are useful for evaluating depositional environment.
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  • An Attempt on Property Classification of Deep Sedimentary Conglomerate by Using Core Samples
    Satoru KAWASAKI, Kameichiro NAKAGAWA, Yoshitake ETO, Akito NOZAKI, Kaz ...
    1997 Volume 38 Issue 5 Pages 296-298
    Published: December 10, 1997
    Released on J-STAGE: June 04, 2010
    DOIhttps://doi.org/10.5110/jjseg.38.296
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  • K-Ar Ages of Gouge of the Koi and Otake Active Faults
    Ryuji KITAGAWA, Hirotsugu NISHIDO, Motoi INOUE, Ken NIIMI, Akihiro MAT ...
    1997 Volume 38 Issue 5 Pages 299-303
    Published: December 10, 1997
    Released on J-STAGE: June 04, 2010
    DOIhttps://doi.org/10.5110/jjseg.38.299
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  • Creep Characteristic of Soft Rock
    Koichi NISHI
    1997 Volume 38 Issue 5 Pages 304-311
    Published: December 10, 1997
    Released on J-STAGE: June 04, 2010
    DOIhttps://doi.org/10.5110/jjseg.38.304
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  • Ground Water Problems Caused by Tunnel Excavation
    Hiroshi OHSHIMA
    1997 Volume 38 Issue 5 Pages 312-323
    Published: December 10, 1997
    Released on J-STAGE: June 04, 2010
    DOIhttps://doi.org/10.5110/jjseg.38.312
    JOURNAL FREE ACCESS
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