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An Experimental Study on Depositional Environments and Consolidation Properties of Shihwa Deposits  

원정윤 (서울대학교 생물자원공학부)
장병욱 (서울대학교 생물자원공학)
김동범 (삼안건설기술공)
손영환 (서울대학교 생물자원공학부)
Publication Information
Journal of the Korean Geotechnical Society / v.20, no.5, 2004 , pp. 49-58 More about this Journal
Abstract
Consolidation properties of Shihwa deposits were analysed by means of depositional environments. Depositional environments including particle size distributions, sediment structures, geochemical properties, porewater chemistries and carbon age dating were analysed using undisturbed samples retrieved successively from a boring hole in the study area. Laboratory oedometer tests and anisotropic consolidated triaxial tests (CKoUC) for undisturbed samples were performed to examine the overconsolidation phenomena. Based on the results of analysis of depositional environments, it was found that the upper silt/clay mixed layer was deposited under marine condition while underlying sand and clay layers were deposited under fluvial condition. Planar laminated structures of silts and clays were dominant in marine deposits. Although there was no clear evidences that geological erosion had occurred in marine deposits, overconsolidation ratios of the upper marine samples were greater than unity Stress Paths of the upper marine samples behaved similarly to those of normally consolidated clays. Data plotted in stress state charts showed that the marine deposits were normally consolidated in geological meaning. These apparent overconsolidation of the marine deposits can be explained by the structures i.e. chemical bonding due to the difference of the rate of deposition, not by geological erosions and ground water fluctuations.
Keywords
Cementation; Depositional environment; Marine clay; Overconsolidation; Structure;
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