Journal of the Japan Society of Engineering Geology

Weathering of mudstone in landslide structure

Takeshi Ando

1963 Volume 4 Issue 1 Pages 3-23
Published: March 31, 1963
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.5110/jjseg.4.3

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Foundation treatment of arch dam by the rock pre

stressing system

Hiroshi Iijima

1963 Volume 4 Issue 1 Pages 24-32
Published: March 31, 1963
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.5110/jjseg.4.24

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The rock pre stressing system was planned for the foundation treatment at the left bank of Kawamata arch dam.
The improving project of foundation consists of transmitting wall, rock prestressing system and retaining wall, and they have very close relations each others.
The follow ing two P. S. methods are adopted for the total prestressing forces and working conditions.
i) DYWIDAG. Method.
ii) B. B. R. V. Method.
The former uses high tension bars and tensile force is 240^t per one bore hole (φ130m/m), the latter uses P. C cable and tensile force is 140^tper one bore hole (φ100m/m).

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G eological conditions under which the so-called soft grounds were formed

Toshio Ikeda

1963 Volume 4 Issue 1 Pages 33-39
Published: March 31, 1963
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.5110/jjseg.4.33

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The so-called soft grounds, characterized by peaty layers, consist mainly of lake or swamp sediments deposited in Holocene drowned valleys which had been blockaded by coastal or flood drifts at the mouth of bay or tributary valleys.
Flood plains between natural levees and deltas near the mouth of gently graded rivers pouring into calm bay are another conditions under which the soft grounds are formed.
Moreover, at some soft grounds, artesian conditions are found.
This may promote the development of soft layers.
The alluvial clays deposited in the drowned valleys surrounded by mountains consisted of mainly volcanic soils and rocks, have a tendency to possess a large void ratio in comparison with ordinary environments.

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Statistic method to represent the general orientation of cracks in rock

Hideji Kashiwagi

1963 Volume 4 Issue 1 Pages 40-47
Published: March 31, 1963
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.5110/jjseg.4.40

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