Landslides
Online ISSN : 1884-3956
Print ISSN : 0285-2926
ISSN-L : 0285-2926
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Volume 26, Issue 1
Displaying 1-6 of 6 articles from this issue
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  • Forecast Methods of Slope Failure Time and Their Case Studies
    Satoshi TSUCHIYA, Hiroshi OMURA
    1989 Volume 26 Issue 1 Pages 1-8_1
    Published: June 10, 1989
    Released on J-STAGE: July 04, 2011
    DOIhttps://doi.org/10.3313/jls1964.26.1
    JOURNAL FREE ACCESS
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    Two forecast methods of slope failure time and results of their applications for seven landslide cases are presented. One is the three points method on the cumulative displacem nt curve, the other is the method of least squares for discrete points on that curve . The equations used to forecast the slope failure time are as follows:
    (1) Equations for the method of three points
    Saito's equations: (1)
    Fukuzono's equation: (5) and (6)
    Kawamura's equation: (8)
    Omura and Tsuchiya's equation as: (11) and (12)
    (2) Equations for the method of least squares
    Saito's equation: (13), (16) and (17)
    Fukuzono's equation: (19), (16) and (17)
    Kawamura's equation: (21), (16) and (17)
    Omura and Tsuchiya's equation: (23), (16) and (17)
    Both methods are useful to forecast the failure time of slope . In a strict sense, the latter method in the tertiary stage can forecast more accurately than the former.
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  • Numerical Study of Transient, Three-Dimensional Saturated Water Table by Bounndary Element Method
    Hiroyuki YOSHIMATSU
    1989 Volume 26 Issue 1 Pages 9-15
    Published: June 10, 1989
    Released on J-STAGE: February 25, 2011
    DOIhttps://doi.org/10.3313/jls1964.26.9
    JOURNAL FREE ACCESS
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    Boundary element method has recently come to be widely employed for the analysis of porous media problem. However, three dimensional analysis of boundary element method has seldom been applied to the transient free surface flow problems because the non-steady seepage point has two normal streams of un-known flux. This paper presents the discretization of three-dimensional boundary element method. Accuracy and versatility of the proposed procedure are demonstrated through the numerical discussion of free surface problems containing the effect of drainage works.
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  • Slope Failures by the 1987 Chibaken-toho-oki Earthquake in the Kazusa-Hills, Boso Peninsula, Central Japan
    Clssification of Failures and Slope Stability
    Toshitaka KAMAI
    1989 Volume 26 Issue 1 Pages 16-25_1
    Published: June 10, 1989
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3313/jls1964.26.16
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    Induced by a shock of earthquake occurred on December 17, 1987, many slope failures happened on hillside slopes of the Kazusa-Hills, Chiba Prefecture, which consist mainly of thick mudstone and their alternations of Plio-Pleistocene. By the type of movement, the influence of joint and stratification, the slope failures can be classified into 5 groups; namely, rock fall, slide on joint surface formed in mudstone, collapse in semi-consolidated sandstone, toppling and bedrock slide. Strength parameters were determined by direct shear tests on three kinds of rock samples concerned in failures: that is, jointed mudstone, semi-consolidated massive sandstone and well-laminated sandstone. The stability analysis was made by using limit equilibrium method on 12 slope failures and one bedrock slide. The original factor of safety before the earthquake shock is inferred to be 1.0 to 2.0, and its relationship with the critical acceleration shows the necessity and usefulness of slope stability maps.
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  • Some Problems of Automatic Obser vation System in Landslide Area
    Akira SUEMINE
    1989 Volume 26 Issue 1 Pages 26-30
    Published: June 10, 1989
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3313/jls1964.26.26
    JOURNAL FREE ACCESS
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    We used integer as a record format, therefore the number of records could be fivefold. Many softwares enabled us to record the deformation of underground continuously under many conditions. The result of pipe-strain meter needed to be checked by an insertion type of strain meter. It is pointed that observer should make sometimes visits of inspection to observation machines in operation and that he should ex amine the sensitivity of extensometer and groundwater-meter. A few weak points, for example problems of thunder prevention, the way of ground and so on, are noted.
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  • [title in Japanese]
    [in Japanese]
    1989 Volume 26 Issue 1 Pages 31-37
    Published: June 10, 1989
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3313/jls1964.26.31
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1989 Volume 26 Issue 1 Pages 41-43
    Published: June 10, 1989
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3313/jls1964.26.41
    JOURNAL FREE ACCESS
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