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 53, Issue 3
Displaying 1-3 of 3 articles from this issue
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Original Article
  • Mechanical Anisotropy and Sedimentary Structure of Kimachi Sandstone, Part 2
    -Elastic Wave Velocity and Uniaxial Compression Strength-
    Hyuck PARK, Manabu TAKAHASHI, Yukiyasu FUJII, Takato TAKEMURA, Naoki T ...
    Article type: Original Article
    2012 Volume 53 Issue 3 Pages 112-120
    Published: August 10, 2012
    Released on J-STAGE: February 28, 2014
    DOIhttps://doi.org/10.5110/jjseg.53.112
    JOURNAL FREE ACCESS
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     Mechanical experiments of sandstone were carried out to investigate an influence of sedimentary structure. Especially, the elastic wave velocity and uniaxial compression strength were carefully measured for cylindrical specimens that were prepared in different direction (every 30 degree from North; size: φ 50 mm, h 100 mm). First of all, a plate shaped block (500 mm × 500 mm × 100 mm) which is parallel to the bedding plane was prepared. Then, totally 12 core specimens were taken from the block. P wave velocity test and uniaxial compression test were performed for the naturally dried specimens, respectively. From the uniaxial compression test results, an alteration of Young's modulus was also calculated such as; E10, E30, E50, E70 and E90 (numbers indicate the percentage of each uniaxial compression strength). Moreover, another plate shaped block which is vertical to the bedding plane and the same direction to the maximum uniaxial strength of parallel block specimens was prepared. The anisotropy of P wave velocity was insignificant for both block specimens. However, anisotropy of uniaxial compression strength was noticeably high on the parallel block specimens. In addition, an information of paleocurrent direction which is parallel to the direction of maximum uniaxial compression strength on parallel block specimens supports that a sedimentation process might can make an anisotropy of mechanical properties even though it is parallel to the bedding plane.
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Report
  • Deformation and Strength Characteristics of Kimachi Sandstone under Confined Compression and Extension Test Conditions
    Naoki TAKAHASHI, Manabu TAKAHASHI, Takato TAKEMURA, Yukiyasu FUJII, Hy ...
    Article type: Report
    2012 Volume 53 Issue 3 Pages 121-128
    Published: June 10, 2012
    Released on J-STAGE: February 28, 2014
    DOIhttps://doi.org/10.5110/jjseg.53.121
    JOURNAL FREE ACCESS
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     To compare the deformation characteristics of Kimachi sandstone under confined triaxial compression and under confined triaxial extension test conditions, triaxial compression tests and triaxial extension tests were carried out. The failures observed in the triaxial extension test were more brittle than those observed in the triaxial compression test. Comparison at the same mean principal stresses showed that the octahedral shear stress τoct in the triaxial compression test was higher than that in the triaxial extension test and that the volumetric strain in the triaxial compression test was smaller than that in the triaxial extension test. The relationship between volumetric strain and mean principal stress showed positive correlations in both the triaxial compression test and in the triaxial extension test.
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