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Volume 17 (1976)
- Issue 4 Pages 153-
- Issue 3 Pages 89-
- Issue 2 Pages 45-
- Issue 1 Pages 1-
Volume 17, Issue 3
Displaying 1-6 of 6 articles from this issue
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Yoshimi OGAWA, Tsutomu HOSHINO1976 Volume 17 Issue 3 Pages 89-99
Published: September 30, 1976
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSTo get vibration characteristics over 23 wards in Tokyo, measurements of “S” and “P” wave velosities were taken at 8 places. From these measurements, more considerable scattering in “S” wave velosities are observed in sandy layers, and gravel and sand layers comparing with clay Formation. And also, as for the “S” wave velosities of upper Yurakucho Layers, we found that N-Value is separated into 2 groups by the values of “N=O” and “N≥1”. The density of subsoil measured in the field using scattering γ-ray is coincided with the density obtained in our laboratory test.
It is possible that the “Kazusa-Group” is one of the strongest seismic baserocks in Tokyo. It was found that the “Kazusa-Group” is thick, for instance, in the Edogawa area, it is over 2, 000m and in the Tama area, over 500m. It means that the layer is physically fixed by referring the resistivity test by electrical logging and the densities of subsoil measured with γ-ray.
“S” wave velosities in the Kazusa-Group measured in Denenchofu area, one of the 8 places, are 580m/s in the field test, and by ultrasonic 650m/s.View full abstractDownload PDF (1419K) -
Sadazi NODA, Shogo MATSUKI, Hiroshi IIJIMA1976 Volume 17 Issue 3 Pages 100-104
Published: September 30, 1976
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSThe Finite Element Method (F.E.M.) has been used as a Means of the stbilty investigation of a dam and it's foundation in the field of darn engineering.
In this case, the most important things are the modification of the geological structure of the damsite and geotechnical costants, such as modulus of elasticity, technical cohesion and frictional cefficient of rock mass.
In this paper, they mainly take up the process of the modification of geological structure of damsite and some examples of geological models and refer to the outline of results by F.E.M. analysis.View full abstractDownload PDF (764K) -
Yoshimasa ISOZAKI, Akihisa TONOMURA, Tadao MITSUNAGA, Kinzo NARITA, Fu ...1976 Volume 17 Issue 3 Pages 105-117
Published: September 30, 1976
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSThis Areai, as shown in Fig. 3, has a basin structure, surrounded by faults or Precambrian basement rocks.
The basin is fflled by alluvium deposits chiefly composed of sands, gravels, clays and calcareous deposits, with some amounts of lavas and pyroclastic rocks originated from Kilimanjaro Volcan. These deposits which are roughly estimated at more than 130m in thickness in the south and seem to become thicker toward north are major aquifers in this area.
As shown in Fig. 9 the total quantity of water recharged in the Kahe-Miwaleni groundwater basin is estimated to be 300, 000, 000m3/year and the quantity of water consumed by surface runoff (mainly from the Miwaleni Spring) and pumping works is estimated 110, 000, 000m3/year. About half the quantity of recharge may be regarded as the object of the future groundwater exploitation. However, it is still dangerous to think that all of 190, 000, 000m3/year can be expoited in future. It is technically impossible to pump out all the potential quantity due to hydrogeological restrictions and power limit of the pumping facilities. The quantity of water that can be practically drawn up should be estimated at most 50, 000, 000m3/year, less than half the potential quantity.View full abstractDownload PDF (2157K) -
Characteristics of its Fracture Thickness and Filled MaterialsSeiken OGATA1976 Volume 17 Issue 3 Pages 118-121
Published: September 30, 1976
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSInvestigations of several dam and nuclear sites are summarized for evaluation of fault activity in Japan.
1) In the site Investgation, especially in the area which basement (Tertiary and pre-Tertiary in age) has no sufficient geologic data of relation between faults and Quaternary layer, characteristics of fracture thickness and filled materials of faults may be useful evidence.
2) Fracture thickness and features of looseness of filled materials are considered to correspond to activity of faults.
3) In the absence of sufficiently reliable absolute dating data on evaluation of displacement along faults, a fault which has fracture thickness less than about 1m (in max.) and its filled materials are consolidated or healed will be considered not to be active.View full abstractDownload PDF (511K) -
[in Japanese]1976 Volume 17 Issue 3 Pages 122-142
Published: September 30, 1976
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSDownload PDF (2141K) -
[in Japanese]1976 Volume 17 Issue 3 Pages 143-148
Published: September 30, 1976
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSDownload PDF (1153K)
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