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 3
Displaying 1-6 of 6 articles from this issue
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  • On the Relation between In-Tunnel HSP and TBM Performance
    Hisao ISAHAI, Practical Application Sub-Group to Tsukui Tunnel
    1997 Volume 38 Issue 3 Pages 104-117
    Published: August 10, 1997
    Released on J-STAGE: June 04, 2010
    DOIhttps://doi.org/10.5110/jjseg.38.104
    JOURNAL FREE ACCESS
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    The in-tunnel HSP method, developed by the Public Works Research Institute, Ministry of Construction, together with 11 civilian companies, shows the superior attributes of reporting results swiftly and economically among some of its important features. For this reason it is the favorable exploration method when the rapid excavation by TBM use and the like is required. In this paper we describe the relationship between the explored outcome and TBM excavation characteristics executed on the Tsukui Water-way Tunnel Construction Project.
    The Tsukui Water-way Tunnel which is situated at the northern part in Kanagawa Prefecture adopted the doubleshielded type TBM (5.4 m in excavation diameter) in the range of 4, 836 m length within about 5, 200 m in total. The geology distributing in the tunnel consists of several types of pyroclastic materials and clastic deposits belonging to the Aikawa Group in the Neogene-Miocene period, whose rock quality are generally excellent.
    Though the HSP has been explored 13 times in all basically before excavating designed D pattern areas, the result examined here is the first application, where the shear zone and some continuous bedding plane faults are recognized. There are eight groups of reflected waves in the HSP profile acquired, showing the most remarkable reflection events at the shear zone position. Concerning the TBM performance in driving, meanwhile, it becomes clear that the total excavation energy is closely related to cutting resistance of rock mass, by considering the relation of its net penetration rate, thrust, torque and consumed electricity to the associated rock mass classification.
    Since the concept of cutting resistance reflects synthetically complicated geological factors, namely slight variations of lithology, discontinuity properties like its orientation, frequency and so on, it has proved to agree well with the HSP findings together with other machine factors.
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    1997 Volume 38 Issue 3 Pages 118-129
    Published: August 10, 1997
    Released on J-STAGE: June 04, 2010
    DOIhttps://doi.org/10.5110/jjseg.38.118
    JOURNAL FREE ACCESS
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  • Evaluation of Seepage Failure Resistance Potential of Dam Foundation with Simplified Tests
    Yoshikazu YAMAGUCHI, Naoki OGAWA, Masaki Kawasaki, Akira NAKAMURA
    1997 Volume 38 Issue 3 Pages 130-144
    Published: August 10, 1997
    Released on J-STAGE: June 04, 2010
    DOIhttps://doi.org/10.5110/jjseg.38.130
    JOURNAL FREE ACCESS
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    Recently, in Japan, not a few dam sites consist of soft and weak rocks or sand and gravel deposits. Because these dam foundations are low in strength, it is required to evaluate seepage failure potential in the designing stage.
    We made dynamical studies on accurate and efficient evaluation of seepage failure potential of dam foundations using laboratory seepage failure test (SFT) for undisturbed specimens and in-situ SFT. However, since dam foundations are usually composed of many kinds of strata and rocks/soils, the evaluation of seepage failure potential is time and money comsuming procedure even with less expensive method, that is, laboratory SFT. If index test for seepage failure potential of soils and soft rocks can be found, rough evaluation by this test makes it possible to perform laboratory and in-situ SFTs efficiently.
    Three simple tests, such as needle penetration test, pick penetration test and scour test, unconfined compression test and laboratory SFT were carried out for 32 kinds of soils and soft rocks at the site which was mainly composed of pyroclastic flow deposits and pyroclastic fall deposits of the Pleistocene age. The detailed investigation of test results was made, and the possibility of simplified and indirect evaluation of seepage failure potential was considered.
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  • Relation between the Groundwater Level and Earthquake Damage in Nagata Area, Western Part of Kobe City
    Yoshiaki TAINOSHO
    1997 Volume 38 Issue 3 Pages 145-152
    Published: August 10, 1997
    Released on J-STAGE: June 04, 2010
    DOIhttps://doi.org/10.5110/jjseg.38.145
    JOURNAL FREE ACCESS
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  • Geological Database
    Shuichiro YOKOTA, Shinji MASUMOTO
    1997 Volume 38 Issue 3 Pages 153-158
    Published: August 10, 1997
    Released on J-STAGE: June 04, 2010
    DOIhttps://doi.org/10.5110/jjseg.38.153
    JOURNAL FREE ACCESS
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  • Application of Fractal Concept in Geotechnology
    Hiroyuki OHNO
    1997 Volume 38 Issue 3 Pages 159-173
    Published: August 10, 1997
    Released on J-STAGE: June 04, 2010
    DOIhttps://doi.org/10.5110/jjseg.38.159
    JOURNAL FREE ACCESS
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