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Volume 24 (1987 - 198･･･
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Volume 24, Issue 3
Displaying 1-5 of 5 articles from this issue
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Takeshi KAMEI, Shoji OGAWA, Toshio IKEDA, Keizo SHIMAZU1987 Volume 24 Issue 3 Pages 1-7_1
Published: December 20, 1987
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIn order to investigate the influence of strain rate on the results of slope stability analysis in landslide area, the ring shear tests were performed on cohesive soil with normally and overconsolidated states under different strain rate.
The conclusions from this study are as follows; i) The shearing strength parameters are affected by the overconsolidation ratio in the specimen and the strain rate. This trend become more clearly as the clay fraction in the sample increases significantly. ii) The safety factor decreases as the strain rate decreases. The values in the case of ε=0 .0004 mm/min and ε=0.004 mm/min are almost the same, while they differ significantly between ε=0.4 mm/min and ε=0 .04 mm/min. iii) The shearing strength parameters considering the actual movement rate and the stress state of the landslide area are useful in making stability analysis.View full abstractDownload PDF (1013K) -
Keizo UGAI1987 Volume 24 Issue 3 Pages 8-14
Published: December 20, 1987
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIn order to investigate 3-D (three-dimensional) stability of slopes of c-φ soils, a new 3-D slice method is proposed by extending 2-D (two-dimensional) simplified Janbu method. This method is applicable to the cases of non-circular slip surface. Two examples of calculation are presented to show the details of calculation procedures and comparatively large 3-D effects on slope stability in practical cases.View full abstractDownload PDF (935K) -
Hisao FUJITA, Hiroyuki YOSHIMATSU, Kazuo SHIRAISHI1987 Volume 24 Issue 3 Pages 15-22
Published: December 20, 1987
Released on J-STAGE: February 25, 2011
JOURNAL FREE ACCESSThe limit equilibrium method has been used for landslide stability. However, it is difficult to evaluate the quantitative relationship between sliding distance and porewater fluctuation. The slope stability calculation by finite element method combined with joint element is executed to clarify the strain and stress conditions along slip surface, and also to analize the acting stress to steel pile constructed in landslide area. The calculated vesults are relatively good and are in accord with the observed values obtained from actual landslides. In this paper, the approach method of finite element method is discussed.View full abstractDownload PDF (1015K) -
Bungo TAMADA, Junji FUKUDA1987 Volume 24 Issue 3 Pages 23-29_1
Published: December 20, 1987
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIt was reported that the landslide surface can be classified into the shearing type and the frictional type.
This report describes the measurement of friction angle (friction coefficient) and the relation between the friction angle and the physical properties. The friction angle can be measured, using the direct shear apparatus a friction plate in it.
The relationship between the friction angle φf and the content of Bentonite Bn is shown as follows, φf=φf0exp(-Af·Bn)
where φf0 and Af are constants determined by the kinds of the clay minerals contained.View full abstractDownload PDF (2216K) -
Effect of Amounts of PrecipitationKiyoharu ISAGAI, Chieko IMAI, Kazuyo ISAGAI, Masahiro FUJINAGA1987 Volume 24 Issue 3 Pages 30-40
Published: December 20, 1987
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIt is well known that landslide are induced by the weathering of bedrocks. In active weathering area, the landslide movements depend directly on amount of precipitation. It is very important to know the change of chemical components of groundwater in the landslide area due to precipitation.
In the Ishikura landslide area, hydrogeochemical reserch on precipitation and the situations of landslides was undertaken. Following the cumulative precipitation of 104 mm and 174 mm, the landslide movements were not hardly active. The chemical components of groundwater in detritus have an tendency of not decreasing so greatly, but that near the main scrap decreased greatly. In the case of cumulative precipitation of 794 mm, the landslide movements were very active. The concentration of chemical components of groundwater decreased largely near the main scrap.However almost no change of that in detritus was noyed.
Among the all chemical components, bicarbonate ion, sulfate ion, calcium ion and magnesium ion were very high concentration. These ions indicate activity of chemical weathering. It is considered that in place, where a high concentration of these chemical components is observed, have a high possibility of landslide for a season that chemical weathering is very active.View full abstractDownload PDF (5185K)
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