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Volume 3 (1993)
- Issue 12 Pages 4-
- Issue 11 Pages 4-
- Issue 10 Pages 4-
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Volume 3, Issue 11
Displaying 1-6 of 6 articles from this issue
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Isao SHIBATA1993 Volume 3 Issue 11 Pages 4-20
Published: September 15, 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe major purpose of this paper is to propose a guiding principle of rational determination of injection pressure in dam foundation grouting, which is related to in-situ stress measured by hydraulic fracturing technique.
Next, the flow properties of cement-based grouts with various mix of common use in the dam foundation grouting have been measured in capillary. The experiments gave the values of the rheological constants such as viscosities and yield values of them. The magnitude of these parameters increases very rapidly with the concentration of the grout. From the results, it is proposed to select the most suitable grout mix to be injected according to the grouting stage.View full abstractDownload PDF (3204K) -
Yoshiaki YAMAGUCHI, Jun KASHIWAGI, Takuji OIKAWA1993 Volume 3 Issue 11 Pages 21-34
Published: September 15, 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe quarry of Hiyoshi Dam is planned to be located at the site which has some layers of sandstone originated in the Mesozoic Era with plenty of thickness. After geological survey in detail, it was found that the site also had some layers of shale with same thickness alternately.
Shale has been rarely used for aggregate of concrete for dams because of its shape and soundness of manufactured particles. But after some tests and examinations executed from a viewpoint of effective utilization of aggregate, it was certified that the shale could be used for coarse aggregate of internal RCD concrete.
Some physical and chemical properties of aggregate made of sandstone and shale were tested and the properties of the concrete using those aggregates were also examined. The results are shown in this paper.View full abstractDownload PDF (2747K) -
Seepage Control and Leakage Monitoring during Impounding at Dam Site with Multiple Groundwater LevelYoshikazu YAMAGUCHI, Kensaku SUZUKI, Naoki OHTA1993 Volume 3 Issue 11 Pages 35-44
Published: September 15, 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSRecently in Japan many dam sites have very complicated groundwater pressure distribution because of their complex topographical and geological conditions. However we have to grasp the distribution of groundwater pressure accurately in order to decide the rational area of seepage control for dam foundations to monitor the leakage from dam reservoirs. We have made a case study concerning rational seepage control and leakage monitoring methods at Yamase Dam by measuring the complicated groundwater pressure distribution with the combination of Multiple Groundwater Level Measuring (MGL) System and conventional measuring method for groundwater levels. The details of this study have been shown and systematic method for monitoring leakage through dam foundation has been proposed in this paper.View full abstractDownload PDF (1924K) -
Yuzo OHNISHI, Mohamed A. SOLIMAN1993 Volume 3 Issue 11 Pages 45-52
Published: September 15, 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe flow of water in the ground was studied in this paper using field velocity vectors as well as pressure head as unknown variables, in order to assess the groundwater behavior more accurately and to analyze environmental problems which requires the velocity distribution to be estimated correctly. Moreover the authors tried to develop an inverse technique which can estimate hydraulic properties by using velocity field measurements. The groundwater problem was numerically treated by means of Galerkin-type finite element method, in which pressure was approximated by a linear shape function and velocity by a quadratic shape function. The numerical treatment was implemented using a computer code. This code was verified with the well known UNSAF code and the verification result was excellent. Some geotechnical and environmental problems were studied by proposed method, with quite good results.View full abstractDownload PDF (1479K) -
Mitsuharu INOUE, Kouji KURIZOE, Kazuo MATSUBARA, Haruyasu MASUMOTO1993 Volume 3 Issue 11 Pages 53-60
Published: September 15, 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper reports an automatic controlling system of a concrete transfer car and its application to the concrete transfer of the concrete dam project.
This system consists of a concrete transfer car which is controlled by a microcomputer unit and the bucket car on which the concrete bucket is automatically located. This system is able to control automatically a concrete transfer car by pushing the start button, and able to load the concrete into the bucket at an optional place on its rails even if the crawler crane is used to lift a concrete bucket. This system was applied to the concrete transfer of the small concrete dam project in Yamaguchi prefecture and it has transfered the concrete 12, 000 times for 2 years. And two persons in usual work went out of use.View full abstractDownload PDF (2281K) -
Shinji MATUTANI, Yoshikatsu SAKO, Takashi NAKAMURA, Kazuaki EZAWA1993 Volume 3 Issue 11 Pages 61-71
Published: September 15, 1993
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn dam construction, using the RCD method (Roller Compacted Dam-Concrete) etc, greencutting (laitance removal) is very important works for the solid joint of structure and watertightness.
This system is developed to save manpowers and work more efficient greencutting.
This system has automatical mechanization and intelligent functions using high-pressure water jet. The main characteristics of this Automatic Green cutting system are as follows.
a) The system has a data base of optimum cutting conditions, and a operator can set the first cutting conditions (water pressure and bight of the water nozzles) easily.
b) The electromagnetic sensors detect the laitance removal conditions and an automatic control function regulates the hight of water nozzles and water pressure.
c) The vacuum mouth, setting at the cutting head, clear the surface of concrete joint.
This paper reports conception and outline of the system, and result of field testing at the dam site.View full abstractDownload PDF (3245K)
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