Journal of the Japan Society of Engineering Geology
Online ISSN : 1884-0973
Print ISSN : 0286-7737
ISSN-L : 0286-7737
Volume 8, Issue 4
Displaying 1-4 of 4 articles from this issue
  • Torahiko Moritani
    1967 Volume 8 Issue 4 Pages 171-180
    Published: December 01, 1967
    Released on J-STAGE: June 04, 2010
    JOURNAL FREE ACCESS
    The Gamagori Tunnel, wihch is one of tunnels under construction by the Aichi Irrigation Public Corporation, is a tunnel passing so-called “masa-do” an efflorescence consisting of granite, located at the end of the west main waterway of the Toyokawa Irrigation Project.
    There is a layer containing under-ground water at the top. part of the tunnel. In making the location, a number of discussions were carrird out on that tunnel should be passed in this masa-do or tunneled into the hard rocks located in the north to avoid this or an open canal should be provided in the direction of the south.
    As the results of various investigation, the construction was commenced after having judged to be quite safe to adopt normal construction method for excavating a tunnel into masa-do. But impossibility of progressing excavation has occured due to water flowing out with masa-do on the way of construction.
    Finally, alternation of the construction method was obliged to adopt pressure construction method, its preparation now being progressed.
    In this report, a consideration will be paid on in what cause was excavating a tunnel into masa-do determined and on the cause to have incured its failure.
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  • Rokuro Morikawa, Shigenori Masuda
    1967 Volume 8 Issue 4 Pages 181-189
    Published: December 01, 1967
    Released on J-STAGE: June 04, 2010
    JOURNAL FREE ACCESS
    Many debris barriers were constructed in the Chichibu Mountains and the distribution of these dams is closely related to geology; tectonic line, rocks and crustal movement. Dams were constructed on the Kannon yama-Tomoe gawa tectonic line which runs from northwest corner to southeast in the Tertiary System of the Chichibu basin. Almost of all dams were distributed in the crystalline schist area of the Toya upheaval mountain block, especially along the Jushi-Kunigami and the Zogahana-Asahine tectonic lines of the outsides of this block, and the drainage of the river Toki. In the Chichibu paleozoic complex they were built on schalstein and black slate along faults.
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  • Noboru Miyamoto, Mizuo Aiba, Katsuji Ohno
    1967 Volume 8 Issue 4 Pages 191-202
    Published: December 01, 1967
    Released on J-STAGE: June 04, 2010
    JOURNAL FREE ACCESS
    In this paper the authors deal with the fluctuations of un-confined ground water levels in relations to precipitation, soil moisture and stream fluctuation in the dry field on R. Tone alluvialfan, Saitama Prefecture.
    Rapid rise of ground water levels is caused by supply of gravitational water which is excess water over the field capacity of soil (a part of precipitation this case), then successive gradual subsidence of them with effluent to streams is observed. By defining the field capacity of soil and evapotranspiration from land surface in each day, the quantity of gravitational water can be estimated. In the studied area, the regularity between the rise of ground water levels and the quantity of gravitational water can be recognized, therefore from the ratio of them the effective porosity of the water bearing layer (gravel) is obtained as 15 per cent.
    The fluctuation of stream levels in a period of a few days influences the ground water table in wells only adjacent to flooding streams. Though in a alluvial fan with conct to streams, the fluctuation of ground water level is governed greatly by precipitation- and a little by stream fluctuation in a whole area.
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  • Tohru Kawasaki
    1967 Volume 8 Issue 4 Pages 203-210
    Published: December 01, 1967
    Released on J-STAGE: June 04, 2010
    JOURNAL FREE ACCESS
    The paper is concerned with the measurement of dip and strike in the sound exploration record.
    The record is influenced in some physical characteristics of the sound; directinality, velocity, exaggeration.
    Then, discussed that these influences should be eliminated in the analysis of the record. And finally, dip and strike is measured by two apparent dip in the cross point of observed lines, by the calculation or nomographic methods usually.
    The nomographic method is convenient to measure many dip and strike.
    It is also introduced in this paper, the compilation and interpretation of the nomograph and the distribution of survey lines.
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