All issues
Volume 38 (1997 - 199･･･
- Issue 6 Pages 337-
- Issue 5 Pages 244-
- Issue 4 Pages 196-
- Issue 3 Pages 104-
- Issue 2 Pages 54-
- Issue 1 Pages 2-
Volume 38, Issue 2
Displaying 1-4 of 4 articles from this issue
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Kazushi MORI, Toshinori KATO, Ken NISHIDA, Tomoya ODA1997 Volume 38 Issue 2 Pages 54-64
Published: June 10, 1997
Released on J-STAGE: June 04, 2010
JOURNAL FREE ACCESSIn order to examine the applicability of vertical electrical sounding (YES) to the Ryukyu Limestone distributing area, we have compared the results of VES and borehole data carried out at the catchment area of Sunagawa Subsurface Dam.
VES curves obtained indicate three or four layer models with high resistivity layer lying between low resistivity layers, and this is compatible with borehole data. Estimation of the thicknesses of layers by VES are not sufficiently successful. However, relatively high correlation coefficient with borehole data (0.79) shows that direct reading method is preferable in estimating basement depths to linear filter method.
Resistivity of Ryukyu Limestone is affected by frequency of cracks, degree of secondary clay content and thickness of surface clay layer. Hydrauliconductivity and resistivity of Ryukyu Limestone show positive correlation weakly, however, it is difficult to predict the permeability of Ryukyu Limestone by VES in the region like this.View full abstractDownload PDF (1773K) -
The Uji Hills, Southern Kyoto Prefecture, Central JapanYoshihiro HIRAOKA, Muneki MITAMURA1997 Volume 38 Issue 2 Pages 65-73
Published: June 10, 1997
Released on J-STAGE: June 04, 2010
JOURNAL FREE ACCESSA possible approach to the origin of sediments in the Osaka Group is discussed on the basis of chemical analysis. The study area is located at the margin of the sedimentary basin of the Osaka Group distributed on the Uji hills, where the Aodani
Gravels, the Joyo A Gravels, the Joyo B Gravels and the Uji Gravels are observed. Chemical analysis of the whole samples were carried out using an X-ray fluorescenc spectrometer, and biotites in the sediments were analyzed using an electron probe micro analyzer (EPMA).
The sediments of the Uji Gravel could not be well discriminated from those of the Joyo A Gravels and/or the Joyo B Gravels by means of contents of Sr and Rb in the XRF analysis, which were useful in the soil discrimination. However, the contents of FeO and MgO (or the MgO/FeO ratios) of the biotites in the fine sediments and/or weathered granitic gravels were effective to the discrimination.
The analytical results were compared with the biotites in the granitic rocks and their weathered products, which were distributed in the hinterlands, by means of the MgO/FeO ratios. As the results, it was presumed that the Joyo A Gravels and the Joyo B Gravels were characterized by the weathered products which had been derived from the Yagyu-type granites, whereas the Uji Gravels included the weathered products which had been derived from the Shigaraki-type granites.View full abstractDownload PDF (1547K) -
Harushige KUSUMI, Makoto NAKAMURA, Kazuhiko NISHIDA1997 Volume 38 Issue 2 Pages 74-82
Published: June 10, 1997
Released on J-STAGE: June 04, 2010
JOURNAL FREE ACCESSIt is well known that the groundwater in rock slope mainly flow joint, fracture zone, fault and discontinuity plane. In this paper, using Dipole-Dipole electric resistivity method, the electric resistivities are continuously measured in a rock slope during five rain fall patterns with the measuring line crossing a fracture zone, and the relationship between the change of apparent electric resistivity and the rain fall are discussed.
As the results, making a comparison between fracture zones and the other rock mass, the characteristics of the change of apparent electric resistivity is quite different, and especially, it is recognized that the relationship between the change of apparent electric resistivity and rain fall can be approximated with an exponential function.View full abstractDownload PDF (1148K) -
Anchors and Steel Pipe PilesHaruo SHUZUI1997 Volume 38 Issue 2 Pages 83-93
Published: June 10, 1997
Released on J-STAGE: June 04, 2010
JOURNAL FREE ACCESSA geological survey was carried out to elucidate the complicated mechanism of landslides which are likely to occur in the Mikabu zone. The anchoring method was modified on the basis of the results of the survey so that it could be used in combination with either grating crib works mostly or steel pipe piles partly to provide slope stabilization more effectively. Execution of the work was conducted in view of the geological conditions of the ground in which anchors were embedded firmly in a pattern determined from the geological condition. Observations of the slope have been made by means of the monitoring of the load cells attached to the anchors and borehole inclinometers so far for the purpose of ensuring that the stability of that slope can be achieved in a well-baranced way, monitoring the behavior of the slope and confirmed the effect of executing this work to stabilize the slope.View full abstractDownload PDF (1536K)
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