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Volume 18 (2008)
- Issue 4 Pages 239-
- Issue 3 Pages 156-
- Issue 2 Pages 80-
- Issue 1 Pages 4-
Volume 18, Issue 2
Displaying 1-4 of 4 articles from this issue
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Tomoyuki SUZUKI, Masaki NIIYAMA, Hiroki TAKEUCHI, Takashi KANDA2008 Volume 18 Issue 2 Pages 80-93
Published: June 15, 2008
Released on J-STAGE: December 12, 2008
JOURNAL FREE ACCESSHamada Dam Redevelopment and Daini-Hamada Dam are planned at the Hamadagawa River in Shimane Prefecture. In general, sediment storage capacity in a newly built dam is estimated on a base of existing records of sedimentation volume for an actual dam that has similar properties in geological features, vegetation, precipitation etc. However, in the case of these dams, the general estimation method wouldn't have enough accuracy, because the sediment movement in both dams would be largely changed due to the dam redevelopment.
In this report, we have estimated the sediment storage capacities of both dams with good accuracy using a numerical simulation model for dam sedimentation, which has been developed by combining the latest prediction techniques and utilizing the existing records stored in the Hamada dam.View full abstractDownload PDF (1901K) -
Shinji FUKUSHIMA, Shigeru TANI, Jun GONOI, Akira KITAJIMA2008 Volume 18 Issue 2 Pages 94-110
Published: June 15, 2008
Released on J-STAGE: December 12, 2008
JOURNAL FREE ACCESSMost of old fill-dams were accumulated with a muddy soil in reservoir. This muddy soil is generally very soft clayey soil accompanied with the changes of the water content and the grading. In order to make efficient use of such a muddy soil as embankment soil, we have developed a new type method to repair the damaged embankment by the cement-mixed muddy soil. The strength and strain behavior of the cement-mixed muddy soil is influenced considerably by the water content and the grading of muddy soil. We propose a strength control method considering the effect of the grading and the water content of muddy soil on the cement-mixed muddy soil, and proved the proposed method by the site investigation test under constructing condition.View full abstractDownload PDF (1188K)
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Toshihiro NAKAMURA2008 Volume 18 Issue 2 Pages 111-117
Published: June 15, 2008
Released on J-STAGE: December 12, 2008
JOURNAL FREE ACCESSThe goal of the Masuda river flood control dam construction project is to construct Masuda river dam for flood control and to redevelop Sasakura dam for stable water intake and conservation of riverine environment. Masuda river dam, which was completed and in-service in FY2005, only for flood control, is rare in the country for equipped with steady drop inlet spillway at its bottom without gate. In this paper, the background of adopting the dam only for flood control; reallocating the storage capacity, which is the main characteristic of Masuda river dam, is reported. In addition, a brief overview of designing and constructing of the steady drop inlet spillway at the bottom is reported.View full abstractDownload PDF (3451K) -
Tsugio YOSHIDA, Yukihiko KOHNO, Masahiro ISHII, Hiroshi KOIDE2008 Volume 18 Issue 2 Pages 118-125
Published: June 15, 2008
Released on J-STAGE: December 12, 2008
JOURNAL FREE ACCESSIn surface investigation of the concrete structures, an investigator has to often access a high place. In such a case, methods such as temporary scaffold and rope access are adopted. However, these methods are expensive, and danger is accompanied. In recent years, the performances of a digital camera and image processing technology have accomplished remarkable progress. So the authors applied these technologies to the remote investigation technique for the concrete structures, and evaluated applicability of the technique for the dam where investigation area is larger and complicated.View full abstractDownload PDF (2636K)
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