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 20, Issue 3
Displaying 1-5 of 5 articles from this issue
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  • Experiment Study on the Mechanical Characteristics of Layered Unisotropic Rocks
    Kenji KASUYA
    1979 Volume 20 Issue 3 Pages 87-96
    Published: September 30, 1979
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.20.87
    JOURNAL FREE ACCESS
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    Physical properties including compressive strength, elastic wave velocities, deformation properties, characterristics on breaking surfaces, etc. were investigated on layered anisotropic rocks such as foliated sandstone, sandy shale, slate, schist, etc. as well as jointy granite.
    These are summarized as follows.
    1) Compressive strengths of layered rocks differ according to the inclination of compression with respect to the direction of layers, showing a concave curve with the minimum value at the inclination from 30°to 45°. The angles corresponding to the lowest strengths depend on the reference compressive strenghs obtained by the tests in which compressive stresses are applied at right angle to layers. Larger strengths correspond to the angle of 30°, while smaller strength to the angle of 45°.
    2) Anisotropic factors for compressive strengths seem to be mainly governed by the stresses occurred at the time of formation of the strata.
    3) Static young's modulus is also dependent on the inclination of the layers. The relation of the former to the latter is similar to that observed in compressive strengths.
    4) Compressive strengths obtained perpendicular to layers are expressed as a linear function of anisotropic factors for wave velocities, such as y=ax.
    5) Properties of isotropic rocks with anisotropic structures (joint, cracks, dikes) may well be explained from the view point of behaviors observed in layered rocks.
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  • On the Estimation of Tunnel Wall Displacement during Excavation
    in the Test-Construction at Dai-San-Shirasaka Tunnel
    Katsuhiro ASANO, Tatsutoshi KONDOH, Hideo WAKASA
    1979 Volume 20 Issue 3 Pages 97-104
    Published: September 30, 1979
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.20.97
    JOURNAL FREE ACCESS
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    It is one of the most important problem for tunnel construction to estimate the final amount of rock deformation.
    This paper deals with the estimation of the final amount from the amount of deformation in the earlier stage of measurements at Dai-Sau-Shirasaka Tunnel which is under construction with the New Austrian Tunnelling Method.
    We have distinctly found that the rock behavior after excavation is constituted with viscous and plasticelastic deformations in adopting new measurement method described in this paper.
    Rock deformation U can be expressed by the following equations,
    U=UV+UEP
    UV=a·t
    UEP=C (1-e-D. L)
    where, UV: viscous deformation
    UEP: plastic elastic deformation
    t: elapsed time after blasting
    L: distance between the observation point and tunnel face
    a, C, D: constants
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  • Hydrogeological Study on the Area around Boso Tunnel
    Tadanobu CHO, Hiromichi SAKAGUCHI, Takao ARINISHI, Noboru YOSHII
    1979 Volume 20 Issue 3 Pages 105-114
    Published: September 30, 1979
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.20.105
    JOURNAL FREE ACCESS
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    Analysis on variation of ground-water level generated by rainfall is one of foundamental points for hydrogeologic investigation. It is generally difficult to analyze the variation. Further, under construction such as tunnelling: we must also consider the variation influenced by artificial conditions.
    The method of analyses in the case of tunnelling still awaits settlement. We have studied the methods of analyses in tunnelling case and found out one of the methods. On the other hand we obtained many data of rainfall and well-water level in Boso tunnel area. Concerning about the hydrologic balance and the change of well-water level, we had a good result which applied to some extent.
    This investigation began in July, 1971 before the construction of Boso tunnel and it has been continuing for full eight years. We gained a lot of data by this investigation.
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  • [title in Japanese]
    [in Japanese]
    1979 Volume 20 Issue 3 Pages 115-119
    Published: September 30, 1979
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.20.115
    JOURNAL FREE ACCESS
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  • Erratum
    1979 Volume 20 Issue 3 Pages a52
    Published: 1979
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.20.3_a52
    JOURNAL FREE ACCESS
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