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Volume 4 (1994)
- Issue 16 Pages 5-
- Issue 15 Pages 14-
- Issue 14 Pages 5-
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Volume 4, Issue 16
Displaying 1-7 of 7 articles from this issue
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Yoshio TAKEUCHI1994 Volume 4 Issue 16 Pages 5-17
Published: December 15, 1994
Released on J-STAGE: April 30, 2010
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Mutsumi KADOYA1994 Volume 4 Issue 16 Pages 18-22
Published: December 15, 1994
Released on J-STAGE: April 30, 2010
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Akira KURODA1994 Volume 4 Issue 16 Pages 23-30
Published: December 15, 1994
Released on J-STAGE: April 30, 2010
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Akira NAKAMURA, Nario YASUDA, Tomoya IWASHITA1994 Volume 4 Issue 16 Pages 31-44
Published: December 15, 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn 1993, Hokkaido in Japan was hit by two large earthquakes with a magnitude of 7.8: the Kushiro Oki Earthquake and the Hokkaido Nansei Oki Earthquake.
This paper analyzes the behavior of dams from earthquake motion records and damage to the dams due to the earthquakes. First, analyzing the acceleration records at dam bodies and sites, we compare various relationships with empirical and theoretical formulae: the maximum acceleration or the predominant period at the dam site rock with the epicentral distance, the acceleration response amplification factor at the crest with the acceleration at the foundation, and the natural period of the dam with the height of the dam. We then outline the behavior and mechanism of several dams damaged by the earthquakes. We conclude that the settlement of the upstream body of the Niwa-Ikumine Dam resulted from liquefaction of the embankment because the liquefaction resistance factors (FL) calculated from drilling inspections are less than 1.0.View full abstractDownload PDF (3594K) -
Aiko KIKUCHI, Hiroshi MAKUTA, Noriaki SHIGENAGA, Yoshimiti KAWAKAMI, T ...1994 Volume 4 Issue 16 Pages 45-53_1
Published: December 15, 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe study on numerical simulation of hyperelastic stress analysis is presented. An aim of the study is to apply the simulation to rubber seal of hydraulic gates, where experimental studies with expensive rubber mould are general for each case.
The difficulty in hyperelastic stress analysis lies in treatment of large deformation and imcompressibility. In rubber seal analysis moreover, it is necessary to take nonlinear friction force into account for some contact region.
Authors succeeded well in the above analysis by adapting Lagrange's method and control of additional displacements in the calculation.
The simulation of deformation of a inflating type seal rubber which is to be used for hydraulic head above 80m shows good reliability in comparison with experimental results. In that simulation, stress distribution in the rubber can also be estimated. Another simulation on a P-shaped seal rubber shows also its usefulness in finding rubber deformation under slide movement of gate with friction and hydraulic load.View full abstractDownload PDF (2010K) -
Junichi TAKAKASHI, Kaneyuki KATO, Toshinobu GOTO1994 Volume 4 Issue 16 Pages 54-68
Published: December 15, 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIt is sometimes inevitable in recent years to construct an earthfill dam even on a soft soil layers. In such cases some special problems associated with soft soil condition will become of more importance than the case of stiff stable foundation conditions. The most significant problem among that was subsidence and stability of slopes. From the conventional stability analyses by means of circular slip surface, it is found that the critical slip circle goes through the foundation ground and some countermeasure will be needed for designing cross section of the dam. Therefore gravel compaction pile was adopted to increase the shear strength of soils and the safety factor of embankment. Some geotechnical consideration were made on the design of gravel compaction pile and finally the safety factor of the dam including the foundation ground could raise to greater than 1.2.View full abstractDownload PDF (2950K) -
Shouichi HONDA, Masamichi WADA, Ken TAKAHATA1994 Volume 4 Issue 16 Pages 69-77
Published: December 15, 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSWe have developed two kinds of green cut machines which apply highly pressurized water cutting and wire brush cutting to remove laitance on the surface of the concrete joint in the dam construction. This paper introduces those machines and describes consideration about application of high pressure water green cut machine.
We have experimented with the green cut machine on the cutting conditions such as the water pressure, the height of the nozzle and the speed of the machine, at several ages of the concrete.
As a result, we have evaluated the applicable range of high pressure water green cut machine and experimentally obtained the executing criteria.View full abstractDownload PDF (2123K)
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