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이영대,인교동 釜慶大學校 2000 釜慶大學校 論文集 Vol.5 No.-
Data obtained from the subsurface exploration in Nak-dong river basin have been analyzed to characterize the general patterns of the soil strata and soil characteristics of soft ground. The soft soil is widely distributed over the entire plain adjacent to the Nak-dong river including the deltaic area in the mouth of a river. The soft clay layer is located below the top sand layer and it is sometimes found below the bottom sand layer in some restricted areas. The physical characteristics in the alluvial layer exhibited a widely scattered distribution and no clear pattern. The natural water content increased from the surface and reached it maximum value at the depth of 20m and thereafter it tended to decrease with depth. The unit weight showed a similar pattern to the natural water content. The soil was classified as CL or CH according to the unified soil classification system. The mechanical characteristics showed a tendency to increase with depth whereas the undrained shear strengths did not. The distribution of sensitivities of the soft clay showed no relation with depth. The values of overconsolidation ratio were distributed widely depending on the site but most of them were concentrated between 0.8 and 1.0 The values of compression index ranged between 0.2 and 1.2 but they showed great differences in the same area.
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