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Volume 9 (1968)
- Issue 4 Pages 147-
- Issue 3 Pages 105-
- Issue 2 Pages 66-
- Issue 1 Pages 1-
Volume 9, Issue 1
Displaying 1-3 of 3 articles from this issue
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Chiaki Onishi1968 Volume 9 Issue 1 Pages 1-36
Published: 1968
Released on J-STAGE: June 04, 2010
JOURNAL FREE ACCESS -
Taro KASAMA, Hiroshi AKIMOTO, Masashige HIRANO1968 Volume 9 Issue 1 Pages 37-50
Published: 1968
Released on J-STAGE: June 04, 2010
JOURNAL FREE ACCESSThe Rokko Tunnel built up in April 1967 is 2843m in length and combines Kobe with the Sanda basin in lesser distance. During its construction, geological survey with datailed mapping in scale of 1/100 was attempted and the results are summarized as follows:
The wall of the tunnel consists of the quartz diorite, granite and rarely lithoidite. The mutual relation between the quartz diorite and the granite can be observed in the tunnel and its adjacent area. The quartz diorite is cut by the granite and is transformed into hybrid rocks in some cases. The lithoidite occures as dyke which is intruded into the quartz diorite and the granite.
Major faults observed in the tunnel are located at 370 m and 530 m points from the southern entrance and the both have crushed zoned of ca. 10m in thickness with much outflow of water, respectively. A number of minor faults are also recognized along the mapped route.
The fractures in rocks often show the same characteristics as those accompanied by the conjugate set due to that stress distribution under which the strike slip faults are expected. It may also be assumed that they are in connection with the tectogenesis by which the faulting is resulted.
Though the zones of the velocity lower than 3 km/ sec., checked by seismic prospecting prior to the construction, were generally assumed to be corresponding to faults and crushed zones, this is not always the case and they seem rather closely related to the direction and or spacing of fractures in parts.View full abstractDownload PDF (1344K) -
Minoru Hitaka1968 Volume 9 Issue 1 Pages 51-61
Published: 1968
Released on J-STAGE: June 04, 2010
JOURNAL FREE ACCESSOn the basis of data obtained from boring and surface survey to Quaternary sediments in the district under consideration, has it become clear that thickness of the alluvium is less than 15m. and early to middle Pleistocene formations lie under the Alluvium.
Besides standard penetration test to these sediments indicates that N value of Alluvial fine to medium sand and silt is not more than 10 at shallower than 5m. underground, while that of Diluvial sand is more than 25 at deeper than 15m. But as for gravel, their N value is not always in proportion to depth where they 1ie.
The Alluvium is composed mostly of shallow sea sediments, on the other hand, the Diluvium contains very often tuffs, and lacustrine materials in the lower part and bay ones in the upper.View full abstractDownload PDF (963K)
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