Landslides
Online ISSN : 1884-3956
Print ISSN : 0285-2926
ISSN-L : 0285-2926
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Volume 21, Issue 2
Displaying 1-6 of 6 articles from this issue
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  • On the Origin of Landslide Slip Surfaces
    Yoshitake EGAWA
    1984 Volume 21 Issue 2 Pages 3-10
    Published: September 30, 1984
    Released on J-STAGE: March 16, 2010
    DOIhttps://doi.org/10.3313/jls1964.21.2_3
    JOURNAL FREE ACCESS
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    Many landslides occur in stratified rock mass; a few landslide, in massive rock mass. In order to explain the phenomena, the joint system in the two geological area is examined on the basis of permeability (Lugeon value) and boring core observation. This reveals that deeper joints are more widely spaced and joints extend much deeper in the stratified rock mass. It is considered, therefore, that the joints are formed under stress relief field and develop remarkably in the stratified rock mass with different elasticity layers.
    A prerequisite for the occurence of a landslide is the existence of a permeable discontinuous fracture dipping toward a valley. Landslides in stratified rock mass move in general, along the stress relief joints. Even in massive rock mass, many landslides occur in peculiar geology, in which remarkable swelling is founded during tunnel excavation. Consequently, slip surfaces of landslides are regarded to originate mostly in joints, due to expansion of either stratified or massive rock mass.
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  • On the Extensiometer (Laminar Displacement Meter) by Usung Differential Method
    Mitsuharu TSUMOTO
    1984 Volume 21 Issue 2 Pages 11-15
    Published: September 30, 1984
    Released on J-STAGE: March 16, 2010
    DOIhttps://doi.org/10.3313/jls1964.21.2_11
    JOURNAL FREE ACCESS
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    The auther has devised the device for the measument of displacements in landslide mass by sensor pipes were inserted into the borehole like the spinal column. Sensor pipe was made up two short pipes which fastend stainless miniature rope respectively, and it led to the surface through in an outertube with togethe. And two stainless miniature ropes connected to a differential meter which moves differential prolongation of the two roper. The amount of sliding movement can be reded directly by the point of the differential meter, and the existence of one or more sliding surfaces can be distinguished. An example of observeition using it give forwing
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  • A New Method for Inverse Calculation of c and φ on a Slip Surface (Part I)
    Fundamental Concept
    Takuo YAMAGAMI, Yasuhiro UETA
    1984 Volume 21 Issue 2 Pages 16-21
    Published: September 30, 1984
    Released on J-STAGE: March 16, 2010
    DOIhttps://doi.org/10.3313/jls1964.21.2_16
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    In this series of studies, a new method is proposed for the inverse calculation of c and φ along a given slip surface in a landslide slope. The method satisfies the condition that the given slip surface must have a minimum factor of safety, as well as the so-called c-tanφ relationship.
    In this paper the fundamental concept is first described. Then, an examination from the standpoint of the new approach is given of Saito's method which is considered to be the most logical of all the conventional methods.
    Detailed exposition of the inverse calculation procedure will be presented on the basis of the Fellenius, Bishop and Janbu methods in the succeeding papers.
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  • Soil-Temperature Survey and Ground-Water Prospecting in a Crystalline-Schist Landslide
    Akira SUEMINE, Michiyasu SHIMA, Toshifumi KONISHI
    1984 Volume 21 Issue 2 Pages 22-30
    Published: September 30, 1984
    Released on J-STAGE: March 16, 2010
    DOIhttps://doi.org/10.3313/jls1964.21.2_22
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    An underground-temperature survey was carried out in summer time and a ground-water prospecting was carried out after a typhoon in a crystalline-schist landslide. Drainage drillings were executed towards lower-temperature zones inferred from the underground-temperature survey. During a typhoon in the next year, the drainage flow rate was 40-720 1/min, which rate was from 4 to 50 times as great as that of low-water flow. At the period of the rain, the ground-water level decreased from one meter to nine meters. The lower temperature zones seem to be caused by high ground-water velocity, while the higher temperature zones by low ground-water velocity. But there was a high temperature spot, where ground water flowed rapidly. The velocity ranged between several cm/sec and 100cm/sec. The intermittent ground-water flow is suggested at two points in the landslide area.
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  • Topographic Information Designed by Computer and it's Applications in Landslide Analysis
    Katsuhiko Hayashi, Shinro Abe
    1984 Volume 21 Issue 2 Pages 31-35
    Published: September 30, 1984
    Released on J-STAGE: March 16, 2010
    DOIhttps://doi.org/10.3313/jls1964.21.2_31
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    Elevation datas from the contour map have been fed into a computer, and the various characteristics of the topography have been designed by some computer programs.
    The applications in these methods have been successfully used for landslide area.
    We express these methods and give some examples of topographic, geological and groundwater analysis.
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  • [title in Japanese]
    [in Japanese]
    1984 Volume 21 Issue 2 Pages 39
    Published: September 30, 1984
    Released on J-STAGE: March 16, 2010
    DOIhttps://doi.org/10.3313/jls1964.21.2_39
    JOURNAL FREE ACCESS
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