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Volume 11 (1974 - 197･･･
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Volume 11, Issue 4
Displaying 1-5 of 5 articles from this issue
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Michiyasu SHIMA1975 Volume 11 Issue 4 Pages 1-8
Published: March 31, 1975
Released on J-STAGE: March 16, 2010
JOURNAL FREE ACCESSStrains of ground surface in many landslide areas have some remarkable features in periods of rainfall and snow melt. Such a strain have considered to be results of creep movements of soil mass soften with water infiltration. In this report, the author treated theoretically the creep movements as the early phase of the landslide. That is, the soil mass in the landslide was modeled two dimensionally as the Bingham's body. The relationships between the dispacement and deformation of the soil mass and its mechanical structure were obtained by the incremental procedure based upon the viscoelastic analysis of the finite element method. So it became clear in the numerical examples that the distribution of the mechanical constants at the slip plane influences the characteristics of the surface strains and the slips, and that the effects of the excavation and the cutting appear more remarkably near the place of the execution.View full abstractDownload PDF (1288K) -
Hiroshi KAWAKAMI, Hirofumi ABE1975 Volume 11 Issue 4 Pages 9-17
Published: March 31, 1975
Released on J-STAGE: March 16, 2010
JOURNAL FREE ACCESSThe slope of the Mt. Iizuna fell down with a big sound on April 18, 1973. Its mud soils flowed down for 2km along two small valleys and reached to the bank of the River Susobana.
The slope of the mountain consists most of tuff-breccia. There is a sandstone or mudstone layer under the top soils on the part of the toe of slip surface.
Engineering properties of soils in the area of the landslide are investigated.
It is considered through the stability analyses that the landslide occured due to increase of pore water pressures of the ground water rised along the boundaries of the strataView full abstractDownload PDF (1761K) -
Bungo TAMADA, Shigeto MAEDA1975 Volume 11 Issue 4 Pages 18-25
Published: March 31, 1975
Released on J-STAGE: March 16, 2010
JOURNAL FREE ACCESSI have reported* that the cohesion and the angle of internal friction of the disturbed clay (a thin layer fromed by rubbing action at landslide face) are changed by ratio of consolidation.
But it is necessary to check whether shearing properties change or not with the time passed since consolidation is started at landslide field.
Thus we obtained the thrust of landslide from the measured value of earth pressure in the observation well, and from this we estimated the change of the shearing properties of slide face. According to the estimation, the calculation results are in approximate agreement with experimental value. Based on the investigation on the pore water pressure, it has become clear that the pore water pressure is divided into the following two classes: one produced by the depth of ground water and the other, namely, the hydrostatic excess pressure produced by the process of consolidation in the disturbed clay.
Accordingly when we calculate the safety factor, it is necessary in some cases to consider two kinds of the pore water pressure.
*B. Tamada: Studies on the Dynamical Properties of Landslide Face and their soil Test: Landslide, Vol. 10, No. 4 (1974)View full abstractDownload PDF (1817K) -
Shin IWANAGA1975 Volume 11 Issue 4 Pages 26-34
Published: March 31, 1975
Released on J-STAGE: March 16, 2010
JOURNAL FREE ACCESSDownload PDF (1570K) -
[in Japanese]1975 Volume 11 Issue 4 Pages 35-36
Published: March 31, 1975
Released on J-STAGE: March 16, 2010
JOURNAL FREE ACCESSDownload PDF (879K)
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