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Volume 16 (2006)
- Issue 4 Pages 257-
- Issue 3 Pages 165-
- Issue 2 Pages 82-
- Issue 1 Pages 6-
Volume 16, Issue 1
Displaying 1-5 of 5 articles from this issue
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Yoshikazu YAMAGUCHI, Motoharu YOKOMORI, Tsutomu ANIYA, Toshiyuki AKAMA ...2006 Volume 16 Issue 1 Pages 6-19
Published: March 15, 2006
Released on J-STAGE: March 27, 2008
JOURNAL FREE ACCESSFilter materials are required to be cohesionless. At present, in Japan, concerning the gradation of filter materials, we have the criterion that the percentage of the soil passing the #200 sieve should be less than 5%. However we can use any coarse grained materials as filters for embankment dams, if we can confirm their appropriate permeability and non-cohesion. We have performed sand castle tests in order to confirm non-cohesion of filter materials of the Taiho Dam. We have decided admixture ratio of crashed rocks and sands to the original filter materials composed of phyllite, which satisfied the non-cohesion criterion based on the results of the sand castle tests. In addition, we have confirmed their appropriate high permeability in the test fill, and the mixed materials of the percentage of the soil passing the #200 sieve to be less than 8% were finally decided as filter materials for the Taiho Dam.View full abstractDownload PDF (1539K) -
Shinji FUKUSHIMA, Shigeru TANI, Akira KITAJIMA, Kouji NISHIMOTO2006 Volume 16 Issue 1 Pages 20-29
Published: March 15, 2006
Released on J-STAGE: March 27, 2008
JOURNAL FREE ACCESSMost of old fill-dams were mostly accumulated with the muddy soil in reservoir that caused the water pollution and the loss of reserved water. In order to make efficient use of the muddy soil as the embankment soil for reinforcing the damaged embankment, we have developed a new type method to repair the old small earth dam embankment by means of the stabilized muddy soil with cement stabilizer. This repairing method is applicable to the reinforcement of the fill-dam embankment (H ≥15 m) larger than the small earth dam embankment (H <15 m). In this paper, we propose the design method to reinforce the old fill-dam embankment by constructing the sloping core and shell zones by cement-mixed muddy soil. The strength parameters (c', φ') by triaxial compression tests is adopted to evaluate the stability of the reinforced embankment slope that compose of the existing embankment and sloping zones constructed by cement-mixed muddy soil in this design method.View full abstractDownload PDF (703K) -
Toshiyuki SAKURAI, Masayuki KAMADA, Josuke KASHIWAI, Tomoyuki SUZUKI2006 Volume 16 Issue 1 Pages 30-40
Published: March 15, 2006
Released on J-STAGE: March 27, 2008
JOURNAL FREE ACCESSIn order to examine the countermeasures for reservoir sedimentation, it is required to predict the effect of them. As a technical tool for that, the one-dimensional movable bed numerical model is considered to be effective. But its reproducibility has not been verified sufficiently by using field observed data. In this study, we carried out calculation of the sediment accumulating and scouring phenomena in Sabaishigawa reservoir by non-uniform particles movable bed model and conducted verification in comparison with the field measured data. As a result, it is revealed that the sedimentation configurations are well predicted by numerical model with two important factors as follows. The first one is the input data of each sediment particle inflow volume estimated from the field measured data of past sedimentation. The second is the erosion rate formula of fine sediment calibrated by the result of physical experiments using the sediment materials collected at the reservoir.View full abstractDownload PDF (1050K)
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Kunitomo NARITA, Katsuyuki KIMURA2006 Volume 16 Issue 1 Pages 55-59
Published: March 15, 2006
Released on J-STAGE: March 27, 2008
JOURNAL FREE ACCESSA method of slope stability analysis, which can utilize numerical solutions of the finite element seepage analysis, was proposed in this paper through the way of expressing the equations in terms of effective slice weight and seepage forces. Some numerical calculations were done on simple earth slopes under a steady seepage state, to discuss the difference in features of stability evaluation between different ways of stability analysis, by comparing the results with those by the way of using total slice weight and pore-water pressure along sliding surface and with those by a practical method of slices published before. Incidentally, a calculation method of the values of hydraulic gradient and directions of flow lines from FE solutions of total head distributions and a way of introducing the effects of seepage forces acting on finite elements in the stability analysis were presented.View full abstractDownload PDF (352K)
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Hiroshi TAKAHASHI, Tsukasa FUJITA, Yasushi KIKUCHI, Toshiyuki TEMMYO2006 Volume 16 Issue 1 Pages 41-54
Published: March 15, 2006
Released on J-STAGE: June 27, 2008
JOURNAL FREE ACCESSSg. Kinta Dam is the first RCC (roller compacted concrete) dam to be constructed in Malaysia. The volume of the RCC used in the dam is approximately 1 million meter cube. The detail of the production equipments such as the crushing plant or RCC mixing plant is not stated in the specification as well as the RCC method statement. Therefore the contractor is able to select and plan these production equipments and method statement flexibly. Because these selections are much affected the economical impact, it is important that the planning is to be properly by well understanding the idea and philosophy of the designer. This report is described the record till now and the problem to be solved with regard to the production equipments including the dry type crushing plant and RCC continuous mixing plant as well as the RCC method statement including the grout enriched-RCC and the slope layer method which are adopted in this project.View full abstractDownload PDF (4152K)
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