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Volume 18 (1977)
- Issue 4 Pages 161-
- Issue 3 Pages 89-
- Issue 1-2 Pages 1-
Volume 18, Issue 3
Displaying 1-5 of 5 articles from this issue
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On the Phenomena Translated from an Alluvial TerraceRyohei IMAMURA1977 Volume 18 Issue 3 Pages 89-106
Published: September 30, 1977
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSIn the previous paper (Imamura, 1976), author discussed on the importance of dynamic geological informations which are obtainable from static geomorphological and geological informations and principle of grasping methods, that is
(1) type of dynamic geological phenomena
(2) movement (displacement, variation, change) of the earth surface due to occurrence of the phenomena
(3) time informations concerned with occurring these phenomena.
Although (3) was explained through concrete examples, (1), (2) where ended in a description of authors idea because of space limitations in the paper. Accordingly, grasping principle of (2) mentioned above is discussed in this paper through the concrete example, that is “alluvial terrace”, on which will be important to engineering geology in the future in our country.View full abstractDownload PDF (2524K) -
Seiji TAKAYA1977 Volume 18 Issue 3 Pages 107-116
Published: September 30, 1977
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSThe geological structure of Ehime prefecture is classified into four terrains, from north to south; Ryoke terrains, Sambagawa metamorphic terrain, Chichibu terrain and Shimanto terrain. The land slide areas exist maily in Sambagawa metamorphic terrain and Mikabu tectonic terrain. Mikabu tectonic terrain lies along the southern periphery of Sambagawa terrain.
The clay samples used for experiments were collected from 24 points in Sambagawa terrain and 6 points in Mikabu terrain.
The results of X-ray diffraction showed that principal clay minerals of the land slide areas in Sambagawa terrain are Chlorite and Illite, and that those in Mikabu terrain are Montmollironite and Chlorite.View full abstractDownload PDF (690K) -
Shin IWANAGA, Teruki ISHIBASHI1977 Volume 18 Issue 3 Pages 117-124
Published: September 30, 1977
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSDownload PDF (2386K) -
Yoshiro HAYASHIDA1977 Volume 18 Issue 3 Pages 125-130
Published: September 30, 1977
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSFrom the results of a field and laboratory investigation, at the upper part of a ground water level, the non-silicified mud stone of Izumi group (Cretaceous period) shows a rapid weathering by the cyclic variation of a pore water content. So the banking and the talus deposit with this mud stone fragment are rapidly decomposed during short term and some-times are destroyed by a land slip.
The main reasons for this property of the mud stone are the followin three;
(1) this mud stone is not silicfied,
(2) this mud stone is consisted of the expansive mixed layer clay minerals and has a high swelling potential,
(3) this mud stone which deposited in the sea environment holds many soluble salts in rock pores.
At the southern foot of Izumi mountain system, there are many land slides which are mostly ascribed to such physico-chemical property of the mud stone.View full abstractDownload PDF (1207K) -
Atsuo TAKEUCHI, Satoshi AKIBAYASHI1977 Volume 18 Issue 3 Pages 131-137
Published: September 30, 1977
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSA similation model on the distribution of underground temperature was given on the basis of the investigation about underground temperature survey in the Matsunoyama landslide area. The results of its numerical analysis where as follows;
(1) If the velocity of underground water, is larger than 2×10-2cm/sec, the heat transmission caused by the flow of the water was very distinguished as compared with that by the heat conduction into the veinstream from soil mass. On the other hand, in situ, as its velocity in the Matsunoyama landslide area is 1.6×10-1cm/sec, it is presummed that the temperature of its flow direction is about the same temperature at the mouth of the vein-stream.
(2) In the Matsunoyama landslide area, the maximum value of difference between a normal temperature at the same depth, which is influenced considerably by the vein-stream, appears from August to September. Therefore, it is the most suitable to carry out the underground temperature survey on the period.
This similation involves some simplifies and assumptions. Therefore, in future, the model is discussed by using many data in situ and may be developed to the practical survey method.View full abstractDownload PDF (899K)
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