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Geotechnical Characterisation of Busan Clay
정성교,류춘길,민세찬,이정만,홍양표,Enkhtur Odgerel 대한토목학회 2012 KSCE JOURNAL OF CIVIL ENGINEERING Vol.16 No.3
In the Nakdong River delta, the depositional environment is slightly different in every locality. An attempt was made to conduct a geotechnical characterization of clay in the floodplain of the delta area, where a series of field and laboratory tests was executed at five sites. The results indicate that variations in the slope of cone resistance change with depth are utilized to stratify the deposits and to extend a paleoenvironmental profile that has been investigated at a neighboring site. Some of the index properties and the compression index appear to correlate with the depositional environment, so that they have a well-defined trend with depth irrespective of location and empirical formulas may be developed between them. However, on the top 10 m layer deposited during regression, several properties are different in the tested sites. The ratio of the field vane strength to the effective overburden stress shows a poor correlation with water content, indicating no relationship with the plasticity index. The in-situ void index Iv0 shows that clays of the Tidal Flat (TF) and Inner Shelf (IS) units are more structured than other normally consolidated clays, whereas that of the Shallow Marine (SM) unit, which is overconsolidated, is not. The sensitivity (St), ranging from 5 to 9 at a location, vary in a manner similar to a well-defined trend of the properties. Based on the Iv0, recompression, and Cc-e0-St relation, the clay is moderately or highly structured but weakly bonded, where Cc is compression index and e0 is initial void ratio.
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정성교,이남기,이정만,민세찬,홍양표 한국지반공학회 2010 한국지반공학회논문집 Vol.26 No.11
To predict the settlement rate of a ground area that incorporates vertical drains, it is desirable to conduct various kinds of advanced field and laboratory tests for hydraulic properties. However, it is urgently needed to appropriately evaluate the hydraulic properties using the results of conventional soil tests which are extensively used for local practice. To achieve this purpose, a number of CPT dissipation test, laboratory permeability and consolidation tests were performed at five sites in the floodplain of the Nakdong River delta, and the test data were comprehensively analyzed. As a result, it is found that the coefficients of horizontal consolidation () and permeability () of the clay agreed well with those of the CPT-based methods proposed by Baligh and Levadoux (1986). The values of and were in the range of 0.4~3.0 cm2/sec and 0.40~2.50 cm2/sec, each of which slightly increases or decreases with depth, respectively. It was also inferred that these trends seem to reflect the depositional environments of the clay.
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Evaluation of the Undrained Shear Strength of Busan Clay
정성교,Yang-Pyo Hong,이정만,민세찬 대한토목학회 2012 KSCE JOURNAL OF CIVIL ENGINEERING Vol.16 No.5
The current paper presents an estimation of the undrained shear strength (su) of Busan clay through a comparison of the results of field vane and laboratory shear test results at two sites in the Nakdong River Delta. The results indicate that because of fabric effects in the clay, determining the effective overburden stress (σv0') and the field vane strength (su,FV) based on the corrected cone resistance (qt) is effective. The ratio su,FV/σv0' varied with the depositional units, independent of the plasticity index (Ip). In comparison to su,FV,combined shear strengths obtained from the consolidated-undrained compression and extension triaxial tests were slightly smaller and occasionally scattered because of the effects of sample disturbance. The laboratory shear strengths rely on the strain rate,regardless of the Ip. The correction factors using two different approaches were larger than those of the existing methods. For practical applications, the qt-based corrected vane strengths with the correction factor (μ) are thus recommended as the mobilized undrained shear strength of the clay (i.e., μsu,FV/ σv0' of 0.23), which is similar to the corrected value of the combined shear strengths for all depths.
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이명성(Myung-Sung Lee),이경주(Gyeong-Ju Lee),김상문(Sang-Moon Kim),민세찬(Se-Chan Min),배재문(Jae-Moon Bae),황준수(Jun-Su Hwang),박철오(Cheol-O Park),김동찬(Dong-Chan Kim),정정현(Jung-Hyeon Jung),안수환(Soo-Whan Ahn) 한국동력기계공학회 2017 동력시스템공학회지 Vol.21 No.5
The effects of the different rib geometries such as V-shaped continuous (case A), parallel broken (case B), and V-shaped broken (case C) ribs on the heat transfer and pressure drops in a divergent channel with 45° inclined ribs on one wall or two walls are checked out. The top and bottom walls are adiabatic; two side walls are uniformly heated in the divergent rectangular channel. The tested Reynolds numbers are ranged from 22,000 to 75,000. The channel with two opposite walls inclined only has the length of test section of 1 m and the channel divergence ratio of D<SUB>ho</SUB>/D<SUB>hi</SUB>=1.49, corresponding to 1.43o inclined walls. The results show in the identical pumping power that the V-shaped continuous rib (case A) with two ribbed walls is the greatest, but the parallel broken rib (case B) with one ribbed wall is the worst in the thermal performance..
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