Journal of Japan Society of Dam Engineers
Online ISSN : 1880-8220
Print ISSN : 0917-3145
ISSN-L : 0917-3145
Volume 16, Issue 3
Displaying 1-3 of 3 articles from this issue
  • Yuji KOHGO, Isamu ASANO, Yoichi HAYASHIDA, Ryoichi TOHMETSUKA
    2006 Volume 16 Issue 3 Pages 165-176
    Published: September 15, 2006
    Released on J-STAGE: June 27, 2008
    JOURNAL FREE ACCESS
    The purposes of this paper are to introduce wireless pore water pressure transducer and to indicate the performance of the transducers installed within embankments of dams. Some experimental tests were conducted to investigate the design specifications. It was confirmed from these tests that the transducers could express more than 100 m underground-communication, the lives were more than 10 years, and the waterproof was more than 3 MPa etc. The installation procedure was also investigated. The wireless transducers and conventional pressure gauges with cables were installed into two real embankment dams constructing by the Ministry of Agriculture, Forestry and Fisheries, Japan. The pore water pressure values measured with these wireless transducers were compared with those of the conventional pressure gauges. It was found from the results that both values measured were consistent.
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  • Yasuo YANAKA, Akira TAKAHASHI, Shigeki URUCHIDA, Makoto NISHIGAKI
    2006 Volume 16 Issue 3 Pages 177-188
    Published: September 15, 2006
    Released on J-STAGE: June 27, 2008
    JOURNAL FREE ACCESS
    Core materials of the Minamiaiki dam are low quality such as coarse grain size distribution, high natural water content, and great variation in the water content. Therefore, such materials were not used as impervious core materials in Japan. To improve this low quality material, it was necessary to solve characteristic problems by increasing the fine fraction content and lowering the mean value and the variation of water content simultaneously. This paper describes a development of advanced quality control method of piling up and slicing off, which mixes the core material with crushed rock together. The quality of the material is evaluated using the two-stage sampling method.
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  • Kazunobu OGAWA, Yasushi KINOSHITA, Toshifumi MIYAKE, Tomohiro NISHIKAW ...
    2006 Volume 16 Issue 3 Pages 189-198
    Published: September 15, 2006
    Released on J-STAGE: June 27, 2008
    JOURNAL FREE ACCESS
    The bed on foundation of ISHII-DAM under constraction by Hyogo Prefecture, has the zone of high permeability (over 20 Lu) to water. The foundation treatment plan was basing the following. i) The purpose is exclusive flood control dam on reservoir operation. Therefore, the leakage from reservior can be allowed compared with dam where water level should be maintained for water supply. ii) The bedrock consists mostly of the granodiorite on the Cretaceous period of Mesozoic era, being firm. Therefore, the dam foundation is steady on underseepage for the long term. Afterwards, the ISHII-DAM construction work was completed. The test of filling began in November, 2004. The test of filling is being continued now. Because the quantity of leakage etc. have been monitored up to now, it reports to here.
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