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Volume 16 (1979 - 198･･･
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Volume 16, Issue 4
Displaying 1-6 of 6 articles from this issue
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Considerations on the Mechanism of the Slope Failure, MyokoYutaka SAITO, Hiroshi KAWAKAMI1980 Volume 16 Issue 4 Pages 1-9_1
Published: April 20, 1980
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe steep slope of Mt. Akakura, near the Shirataki-Fall hanging in the upper coarse of the Shirotagiri River which flows eastwards from the Myoko Caldera to drain into the Seki River, had failured on May 18, 1978.
Collapsed soils and rocks had made a debris-avalanche and attacked the New Akakura Spa four kilometers downstream.
As the results of investigation on the slope failure, the primary collapse phenomenon occured early in the morning of the day can be subdivided into following three steps; the initial, the main and the continual failures.
These failures are mainly due to the seepage of the melting water of the snow into the debris which was laid on the slope under the unstable conditions.
Moreover, it is undeniable that the slope failure is accelerated by the defenseless forest road constructed across the slope.View full abstractDownload PDF (6678K) -
Bungo TAMADA1980 Volume 16 Issue 4 Pages 10-15_1
Published: April 20, 1980
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe landslide face of plane shape is formed in the thin clay layer softened by the weathering of Tertiary layer. This clay layer is often called ‘latent slide face’, because the latent slide face has a basic factor in the landslide. Accordingly the landslide face is formed in the this part of clay by the occasion.
Therefore, the length of landslide face in the latent slide face decides the shape of landslide, which is not a fortuitous resuit but the inevitable consequences. When the constants of shearing strength and physical properties of the clay layer are obtained by the soil tests, the length of landslide plane formed by the several causes is expressed by the following factors: that is, the average depth of the latent slide face h, the average inclination of the latent slide face θ, the coefficient of passive earth pressure in the upper part of the latent slide face kp, and the pore water pressure acting on the length of slide plane hw.
It is very hard to measure the pore water pressure hw, when new landslide is caused by the heavey rain. Therefore, it is desirable that the shape of landslide plane should be used for the presumption of pore water pressure hw.View full abstractDownload PDF (985K) -
Atsuo TAKEUCHI1980 Volume 16 Issue 4 Pages 16-24_1
Published: April 20, 1980
Released on J-STAGE: February 25, 2011
JOURNAL FREE ACCESSA landslide area is the living place for people from ancient time, and therefore in the place there should be the history of the complication between the people and the landslide movement for a long time. The author, thereupon, searched for the historical data on the people and the mass movements and data on the deformation of topography in the Choj a landslide area, and could obtain the information about the way of disposal with the landslide movements and some precious keys to investigation of direct cause of mass move ments, elcidation of movement mechanism, and planning of preventive countermeasures.View full abstractDownload PDF (5237K) -
[in Japanese]1980 Volume 16 Issue 4 Pages 25-32
Published: April 20, 1980
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (3048K) -
[in Japanese]1980 Volume 16 Issue 4 Pages 33-34
Published: April 20, 1980
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (317K) -
[in Japanese]1980 Volume 16 Issue 4 Pages 35-37
Published: April 20, 1980
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (3956K)
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