Landslides
Online ISSN : 1884-3956
Print ISSN : 0285-2926
ISSN-L : 0285-2926
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Volume 24, Issue 4
Displaying 1-7 of 7 articles from this issue
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  • Search of the Landslide Mass by the Image Analysis of Aerial Photograph
    Saburo NAKAMURA
    1988 Volume 24 Issue 4 Pages 1-10
    Published: March 20, 1988
    Released on J-STAGE: February 25, 2011
    DOIhttps://doi.org/10.3313/jls1964.24.4_1
    JOURNAL FREE ACCESS
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    A method of analyzing the aerial photograph of the landslide area has been developed to extract the area covered with the deposit by the past landslide or collapse, which is known to be in danger of the secondary land-slide or collapse. In this method, the image of aerial photograph is analyzed by measuring the light intensity reflected on the surface of aerial photograph. It is found that on sweeping the image the light intensity change with many oscillations of with period are smaller than the area of landslide and collapse. The block of landslide can be extracted from the image analysis, because the amplitudes of the oscillations in the block of landslide are appreciably different from the area which has sufferad no landslide. In the interior of the past landslide mass, the pulse oscillations are observed at the deforming and crashing ground.
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  • On the Forecast of Time to Failure of Slope
    Time Process of Slope Failure
    Setsuo HAYASHI, Fujiya KOMAMURA, Bo-Won PARK
    1988 Volume 24 Issue 4 Pages 11-18_1
    Published: March 20, 1988
    Released on J-STAGE: February 25, 2011
    DOIhttps://doi.org/10.3313/jls1964.24.4_11
    JOURNAL FREE ACCESS
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    In this paper, process of slope failure is studied from phase of displacement (l) and its velocity (υ) along the slope. Velocity (υ) of displacement was calculated from the experimental data and the field data of slope failure, and the obtained date on υ and l are ploted on graph paper. It is found from these plots that process of slope failure expressed as tertiary creep contains two stages, which are called the first stage (I) and the second stage (II). In this failure process, the first stage (I) can be approximately expressed by υ=al+υ0, and the second stage (II) is expressed by υ=υ0 exp (b (l-l0)).Solutions of these υ-l equations are expressed as: υ=υ0 exp (at)(stage (I)), and υ=υ0/ (1-bυ0 (t-t0))(stage (II)). It is confirmed from date analysis that equation for stage (I) and stage (II) are applicable to 1/υ-t plot of date on graph paper. The solution for stage (I) expressing 1/υ-t shows a linear relationship on semilog graph paper, and applied range of this solution holds with time most of process for tertiary creep.Final slope failure occures shortly, coming to range of stage (II), the plot of 1/υ and t at this stage becomes a linear relationship on normal graph paper.D
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  • Forms of the Ancient Landslide in Toyomaki Area
    Masaru YAMASHITA, Shinro ABE, Nobuo SATO, Tomio MORIAI
    1988 Volume 24 Issue 4 Pages 19-24
    Published: March 20, 1988
    Released on J-STAGE: February 25, 2011
    DOIhttps://doi.org/10.3313/jls1964.24.4_19
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    In recent years, many papers on the ancient landslides have been reported, but, there are few reports that investigate in detail geologically and applied geologically
    Moriai and Chiba (1985, 1986) have studied the form of ancient landslides along the Dozan river, the Tsunokawa river watershed and from a view point of geologic phenomenon in their fieldwork, they have reported that the recent landslide was affected by the ancient one.
    After that, we have investigated many data about internal structure in Toyomaki landslide synthetically. As a result, a lot of same phenomena and structure of ancient landslide were found in detail.
    We believe that the paper will be of great value in interpreting the large scale landslide of the Tertiary in Japan.
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  • Effects of Drainage Works in Sarukuyouzi Landslide
    Kiyoteru MARUYAMA, Masasi KONDOU, Masakazu YOKOYAMA
    1988 Volume 24 Issue 4 Pages 25-32
    Published: March 20, 1988
    Released on J-STAGE: July 04, 2011
    DOIhttps://doi.org/10.3313/jls1964.24.4_25
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    The landslides locating at Tertiary mudstone area greatly occur in snowmelting seasons. The drainage works have been often used to prevent these landsliding. In order to establish the planning method for those drainage works, we measure the fluctuation phenomena of porewater pressure in Sarukuyouzi landslide. This paper discusses the drainage effective area through the conclusions drawn from a comparison of the results obtained by analtical methods and field data.
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  • [title in Japanese]
    [in Japanese]
    1988 Volume 24 Issue 4 Pages 33-35
    Published: March 20, 1988
    Released on J-STAGE: July 04, 2011
    DOIhttps://doi.org/10.3313/jls1964.24.4_33
    JOURNAL FREE ACCESS
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    [in Japanese]
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1988 Volume 24 Issue 4 Pages 35-38
    Published: March 20, 1988
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3313/jls1964.24.4_35
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  • [title in Japanese]
    [in Japanese]
    1988 Volume 24 Issue 4 Pages 39-40
    Published: March 20, 1988
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3313/jls1964.24.4_39
    JOURNAL FREE ACCESS
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