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조기영,유갑용 동아대학교 건설기술연구소 1997 硏究報告 Vol.21 No.2
The conventional three-dimensional consolidation theory is accumulated to observe the behaviour of consolidation on soft clay with a vertical drain installed and it is aimed to find the most suitable 3-D theory by carrying out the axisymetric analysis in F.E.M for which CRISP 93 has been used. The results showed as follows : The axisymetric analysis and Onoue's(1988) theory which is a rigorous solution and an approximate equation show the best suitability.
조기영,최관희,유갑용 동아대학교 건설기술연구소 1997 硏究報告 Vol.21 No.2
Prediction of consolidation settlement and time must be always erroneous because of soil media, errors associated with the measurement of soil parameters, drawback of consolidation theories and so on. When Oiling on compressible soils, the observational method is a useful means in pratice to evaluate the final consolidation settlement and time. However, the ousted observational procedures include some disadvantages which are difficulty of finding the linearity in the settlement curves, which a personal error seems to be unavoidable and so on. A new observational procedure(√s method) is suggested here to perform the consolidation analysis in field. As the results of applying the √s method with another methods to two field data, the final settlement predicted by the √s method as well as by the Asaoka's method agreed well with the measured value. However, one by the hyperbolic method(Tan, 1991) was overestimated, and there happened many cases not to predicted by the Hoshino's method. In the settlement curve from the √s method, the linearity between 60 and 90% of the average degree of consolidation is showed, and then the possibility of happening a personal error seems to be unusual. The final consolidation time(at 0.95s_(f)) predicted by the √s method agreed well with the measured one, but one by Asaoka and Tan(1996) methods was very much underestimated or overestimated. The big errors by the two methods seem to be the cause unconsidered the effect of step loading.
민병형,이승휘,민일규,유갑용,임대영 東亞大學校 海洋資源硏究所 1996 硏究論文集 Vol.9 No.1
To investigation the diffusion of suspended material we use a 3-D unsteady numerical model based on the Euler method. We applied the model to mainstream of Nak Dong River confluence of Miryang river place at KyungNam kimhae-Si Saenglim-Myon Masa-Ri. We pridicted the concentration of suspended material due to dredging at a near by water-supply intake.
河床變動 豫測에 관한 硏究 : 密陽江이 合流하는 洛東江 本流地域을 中心으로
閔丙亨,李承輝,閔一圭,兪甲鎔,吳尙龍 동아대학교 건설기술연구소 1996 硏究報告 Vol.20 No.1
In this study, when we collect river bed sediment at the point where mainstream of Nak Dong river join branch of Mil Yang river, the change of river bed around downstream area was estimated and based on experimental data using three dimensional unsteady flow model about the water level to quantity of water and velocity and river bed change through numerical imitation experiment and hydraulic model experiment.