Journal of the Japan Landslide Society
Online ISSN : 1882-0034
Print ISSN : 1348-3986
ISSN-L : 1348-3986
Volume 50 , Issue 6
Showing 1-7 articles out of 7 articles from the selected issue
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Original article
  • Tomohiro ISHIZAWA, Naoki SAKAI, Toshikazu MOROHOSHI, Teruki FUKUZONO
    2013 Volume 50 Issue 6 Pages 256-267
    Published: 2013
    Released: December 20, 2013
      This study investigated deformation behavior that has been recognized as a precursory phenomenon of slope failure. The slope failure tests were conducted in which the deformation behaviors of model slopes were measured. The surface displacement of a sand model slope was measured using an invar wire extensometer, and the underground displacement was measured with a connected inclinometers together (or an inclinometer). The results indicated that the surface and ground displacements behaved similarly. The results also clarified the underground deformation behavior under different stress conditions. In addition, the results of the underground displacement measurements using the inclinometer was applied a prediction method using the reciprocal of velocity, and this paper showed the effectiveness of underground displacement measurement and the prediction of slope failure by the inclinometer.
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  • Tomohiro ISHIZAWA, Naoki SAKAI, Teruki FUKUZONO
    2013 Volume 50 Issue 6 Pages 268-278
    Published: 2013
    Released: December 20, 2013
      The prediction of the slope failure time is evaluated by a method based on creep velocity of the surface displacement of the slope in normal engineering. However, such a method has problems in that the velocity of the tertiary creep is affected by many different conditions and it is difficult to judge the stage of the tertiary creep.
      This study examined the change over time of the slope displacement rate (velocity) and derived a criterion for tertiary creep. Model tests were conducted on a large-scale sand slope during periods of rainfall. The test results indicated that the change point of the slope displacement rate occurs at the same time at all positions of the sliding soil mass. In addition, the study showed the effectiveness of the judgment criteria using the slope displacement rate changes in a rainfall-induced slope failure.
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Technical report