Landslides
Online ISSN : 1884-3956
Print ISSN : 0285-2926
ISSN-L : 0285-2926
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Volume 27, Issue 1
Displaying 1-6 of 6 articles from this issue
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  • On the Occurrence of the Landslide Based on the Field Experiment
    The outline of the experiment and the characteristics of the land deformation
    Hiroshi KAWABE, Hirofumi SHIBANO, Kunihiko NISHIO, Isao YAMAGUCHI
    1990 Volume 27 Issue 1 Pages 1-10
    Published: June 25, 1990
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3313/jls1964.27.1
    JOURNAL FREE ACCESS
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    The experiment in that the landslide was artificially made to occur by the excavation at the lower part of slope and to pour water into the ground has been done on the natural slope in the mudstone area in the Tertiary. And the process of shearing deformation of the ground was grasped as the early stage of the occurrence of landslide. Consequently, in this experiment it was presumed that the rise of porewater pressure and ground-water level did not influence directly on the occurrence of landslide and the lowering with time of the strength of the ground affected it. Furthermore, assuming that the ground showed the behavior of the Voigt body during the early two days and after that the Bingham flow and the yield stress lowered with time, the phenomena were explained for the present.
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  • Saturated-unsaturated Seepage Analysis by Boundary Element Method
    Hiroyuki YOSHIMATSU
    1990 Volume 27 Issue 1 Pages 11-18_1
    Published: June 25, 1990
    Released on J-STAGE: July 04, 2011
    DOIhttps://doi.org/10.3313/jls1964.27.11
    JOURNAL FREE ACCESS
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    Saturated-unsaturated seepage flow analysis by boundary element method has not been reported in the analysis of heterogeneous of anisotropic porous media. To permit accurate analysis by the boundary element method, a governing equation showing by the total pressure head as a key term is set up, and an interpolation function for non-linear permeability coefficient applied in the finite element method is used. Some examples of practical analysis are presented to demonstrate that the proposed technique can be applied to analysis of heterogeneous or anisotropic media reveal that the technique is not inferior to the finite element method. Under Non-Darcy conditions, in particular, the technique permits easy treatment of non-linear terms involved in the boundary element method.
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  • Slope Stability Analysis and Prevention Work Planning by FEM
    Hisao FUJITA
    1990 Volume 27 Issue 1 Pages 19-26
    Published: June 25, 1990
    Released on J-STAGE: February 25, 2011
    DOIhttps://doi.org/10.3313/jls1964.27.19
    JOURNAL FREE ACCESS
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    The limit equilibrium method has been used for the stability calculation of landslide submerged by reservoir water. However, it is difficult to evaluate the relationship between sliding distance and porewater pressure. The slope stability calculatioh by F. E. M. combined with joint element is studied to clarify the strain and stress condition along the slip surface, and also to analize the stress of steel pile and anchor works constructed in landslide area. In this paper, the claculation procedure by F. E. M. is discussed.
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  • Characteristic Properties of Groundwaters from Fresh and Old Landslides
    Tertiary Landslide Area in Niigata Prefecture
    Osamu SATO, Sigeru AOKI
    1990 Volume 27 Issue 1 Pages 27-33
    Published: June 25, 1990
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3313/jls1964.27.27
    JOURNAL FREE ACCESS
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    Spring waters and groundwaters were collected from stable slopes and landslides in the Tertiary landslides area in Niigata parfectur and analyzed for major ion constituents. The characteristic properties of groundwaters in the fresh Tertiary landslides were sammarized as follows. Electric conductivity of spring water or groundwater from the fresh landslide area was 10 times higher than it from the stable slope or the old landslide.(Ca, Mg) (HCO3) 2 or (Ca, Mg) SO4 is a main component of spring waters from the stable slopes and the old landslides. In the fresh landslides, Na2SO4, NaHCO3 or NaCl is a characteristic constituent. Ca2+/Mg2+is nearly constant (1-1.3) in samples in which Na+ was dominant cation. This fact suggests that Na+dominant water was closely connected with fresh mudstone. It was concluded on the bases of anion distribution that in the fresh landslides, HCO3-and Cl-originated from deep water and SO4-- was supplied by oxidation of pyrite.
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  • [title in Japanese]
    [in Japanese]
    1990 Volume 27 Issue 1 Pages 34-38
    Published: June 25, 1990
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3313/jls1964.27.34
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1990 Volume 27 Issue 1 Pages 39-44
    Published: June 25, 1990
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.3313/jls1964.27.39
    JOURNAL FREE ACCESS
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