Journal of the Japan Society of Engineering Geology

Landslide at Toyohama, Otobe V., Hokkaido, Japan (I)

Toshio Sasaki, Kinya Kido

1964 Volume 5 Issue 2 Pages 55-70
Published: June 10, 1964
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.5110/jjseg.5.55

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Engineering Geology and Tunnel Water of Bentenyama Tunnel, New Tokaido Line.

Toshio Ikeda

1964 Volume 5 Issue 2 Pages 71-80
Published: June 10, 1964
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.5110/jjseg.5.71

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Benten-yama tunnel, about 1.3km long, is located near by Kozu, South-West of the Oiso hill land mainly consisted of diluvium-tertiary formations. Along the tunnel site, the hill is chiefly constituted by alternation of sand gravel beds and tuffaceous mudstone beds.
Because of the existence of the unconsolidated sand gravel beds with much poor water enclosed by impermeable mudstone beds, pilot tunnel is often damaged by collapse with see page water. The maximum total tunnel water abount to 8400l/min. Relations between the geological conditions and the amount of the tunnel water are discussed in this paper.
By the methods of the roundabout pilot tunnel driving at the collapse points, the pilot tunnel finished in Dec. 1961, and the tunnel completed in June.1962.

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A Contribution to Statistical Analysis in Geology by Using Wulff's Net

Seiken Ogata

1964 Volume 5 Issue 2 Pages 81-91
Published: June 10, 1964
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.5110/jjseg.5.81

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In the engineering geologic field, statistical analysis by means of Schmidt's net on geological separations which developed in the rock foundation of structures, have prevailed. The statistical description of separations is preferred orientation and frequency (usually described as %), by which geomechanical conditions of the rock foundation are treated.
In a polar equal area net of Schmidt's net, areal error within 15% among the central portion and a periferal portion in the net occurs, which is caused by calculating with a same sized and shaped pointcounter. Therefore, preferred orientation of a population can not be accurately described.
For the adequate counting in statistical analysis, a basic theory of a correct point counter and its counting operation are discussed.

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Lithological Consideration on Physical Properties of Rock Specimens

Hiroshi Ishigai, Kenzi Kasuya, Kazuo Saito

1964 Volume 5 Issue 2 Pages 92-100
Published: June 10, 1964
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.5110/jjseg.5.92

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This paper presents test results of physical properties.and the relation among them on about 100-rock specimens at many dam sites. The values of specific gravity, absorption, compressive strength, Young's modulus of them are considered from the lithological view point. Through them, it is found that the above properties of rocks will depend on the size of mineral particles, and that there will be the following two groups in rocks; one group is the rocks containing most of micro particles or clay minerals, and the other group clearly visible mineral particles.

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[title in Japanese]

[in Japanese]

1964 Volume 5 Issue 2 Pages 101-104
Published: June 10, 1964
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.5110/jjseg.5.101

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[title in Japanese]

[in Japanese]

1964 Volume 5 Issue 2 Pages 105-107
Published: June 10, 1964
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.5110/jjseg.5.105

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