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 56, Issue 6
Displaying 1-8 of 8 articles from this issue
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Original Article
  • Tunneling Management by Seismic Survey using Excavation Blasting
    Kazuhiro ONUMA, Masashi NAKAYA, Hiroyuki YAMAMOTO, Atsuya NISHIKAWA
    2016 Volume 56 Issue 6 Pages 289-297
    Published: February 10, 2016
    Released on J-STAGE: April 29, 2016
    DOIhttps://doi.org/10.5110/jjseg.56.289
    JOURNAL FREE ACCESS
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    TFT survey is using seismic wave occurred by an excavation blasting can be carried out without interruption of tunnel excavation work. TFT survey is able to evaluate geological condition around a tunnel face in real time using direct waves. At the same time, this is able to predict geological change, for example fault or fracture zone, ahead of tunnel face trough analysis of reflect waves. As a result, much geological information can be gotten without interruption of tunnel excavation work.
    This paper is reported the results of TFT survey carried out in a road tunnel construction in Japan. The changes of geological condition are estimated from the evaluation of direct waves. And the ten times of predictions ahead of the tunnel face are carried out, the results are utilized for tunnel excavation. As results, tunnelling management by seismic survey using excavation blasting is proposed.
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Report
  • Geological Mapping on the Shafts and Galleries Walls on the Mizunami Underground Research Laboratory Project
    Tadahiko TSURUTA, Eiji SASAO
    2016 Volume 56 Issue 6 Pages 298-307
    Published: February 10, 2016
    Released on J-STAGE: April 29, 2016
    DOIhttps://doi.org/10.5110/jjseg.56.298
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    Japan Atomic Agency （JAEA） are performing Mizunami Underground Research Laboratory project (MIU project), which is a broad scientific study of the deep geological environment as a basis of research and development for geological disposal of nuclear wastes. Geological investigations, reflection seismic surveys, borehole drilling, etc., are carried out to understand the distribution and properties of important geological structures (permeable fractures, faults, etc). This report summarizes specifications and data characteristic of geological mapping on the shafts and galleries walls, and describes contributions to developments of geological model based on the results of geological mapping.
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  • Research of the Tunnel Soundness Diagnostic Methods for the Time-Dependent Deformation in Tunnel
    Kenji OKAZAKI, Yoshihiko ITO, Hiroumi NIWA, Hideyuki MURAYAMA, Katsute ...
    2016 Volume 56 Issue 6 Pages 308-315
    Published: February 10, 2016
    Released on J-STAGE: April 29, 2016
    DOIhttps://doi.org/10.5110/jjseg.56.308
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    Characteristics of rock minerals and the geological properties of the tunnel which occurred the heaving as a tunnel deformation after its completion are investigated. And we also carried out a study for a diagnostic method in actual tunnel with time-dependent deformation using seismic velocity in order to evaluate the soundness of tunnel ground. The mainly geology of this tunnel is dacite, pyroclastic rock and andesite lava. These rocks have been altered by hydrothermal alteration. As a result of mineralogical test, the information of the combination of minerals is effective for the one of indexes the prediction of swelling and the deterioration of the rock have been indicated. As the result of seismic refraction survey, the seismic velocity of non-deformed section is higher than deformed section. Moreover, it is suggested that the soundness of rock mass can be evaluated by the decrease ratio of seismic velocity.
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  • Development and Site Application Cases of the Three-Dimensional Measurement System of Discontinuous Surface in the Tunnel Face
    Shigetaka ISHIHAMA, Koichi AOKI, Masahiro KATAYAMA, Hitoshi TEZUKA
    2016 Volume 56 Issue 6 Pages 316-324
    Published: February 10, 2016
    Released on J-STAGE: April 29, 2016
    DOIhttps://doi.org/10.5110/jjseg.56.316
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    The authors have been developing techniques to measure dip and strike of discontinuities at a tunnel face with three-dimensional scanners and photography. Regarding minimization of the technique's impact on the tunnel construction cycle as an important factor in promoting this method, they have explored measuring methods and systems which are most suitable even at the actual tunnel construction site.
    This time, they will report the assessment of the measuring methods and systems they have developed so far, based on results from on-site applications. The outcomes resulting from this development would be effective not only as a technique for making quick safety assessments of a tunnel face, but also as a reference against which the ground of a tunnel under maintenance is assessed.
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  • Evaluation of Fractured Neogene Mudstone for Tunnel Excavation
    Takuji YAMAMOTO, Hidehumi SATO, Hiroki SAITO, Tatsunori KASHIMA, Kensu ...
    2016 Volume 56 Issue 6 Pages 325-335
    Published: February 10, 2016
    Released on J-STAGE: April 29, 2016
    DOIhttps://doi.org/10.5110/jjseg.56.325
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    The KITANOMINE tunnel (length : 2,928m) is a long bored tunnel. The north part of the tunnel is surrounded by squeezing mudstone, which became heavily fractured and then changed to clay as the tunnel advanced. The deterioration was so severe that the tunnel convergence and the crown settlement reached a non-negligible level. For safe and reasonable tunnel excavation, accurate evaluation of the ground conditions became more important. This report presents various kinds of new survey, measurement and devised boring method.
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  • Method of Tunnel in Squeezing Mudstone
    Makoto TOYAMA, Hiroshi HASHIMOTO, Tsuyoshi KITAZAWA
    2016 Volume 56 Issue 6 Pages 336-342
    Published: February 10, 2016
    Released on J-STAGE: April 29, 2016
    DOIhttps://doi.org/10.5110/jjseg.56.336
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    Kishima-group mudstone caused inner displacement in Tawarazaka tunnel. The inner displacemenat is characterized by squeezing.
    In order to be safe and efficiency, it was proposed appropriate selection of tunnel supports and pilot core boring. The tunnel supports are get a high support structure and early closure. The pilot core boring help estimation of ahead geology.
    In this paper report the tunnel method such as early closure and pilot core boring in squeezing mudstone.
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  • Research and Development of an Exploration Method using the Vibration During the Excavation Work
    Takuro NISHI, Naruki WAKABAYASHI
    2016 Volume 56 Issue 6 Pages 343-349
    Published: February 10, 2016
    Released on J-STAGE: April 29, 2016
    DOIhttps://doi.org/10.5110/jjseg.56.343
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    Knowing the geological condition ahead of a tunnel face can reduce to unexpected events, and it can also contribute to cost-reduction and to achieve more rapid construction. Exploration technique described here is an application of the so-called reflection method. The estimation of a geological changing point was carried from the measurement of strikingvibration by a hydraulic rock-breaker when performing excavation work. The receivers are fixed on the head of rock bolts via installation tools, so it is never almost inhibit usual construction cycles. The reflecting position was estimated from the finding a common point on travel-time ellipses. By repeating this work while the excavation work, the exploration accuracy can be expected to improve. As a result of the field experiment in some tunnels, effectiveness of this method was confirmed.
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