해양토질의 지반특성치 결정

Abstract

In this paper, methods of determining characteristic values for geotechnical reliability-based design were analysedfor Korean marine clays.The characteristic values using the Student approach were closest to the mean value ofparameters followed by the characteristic values using Ovesen, Schneider and EN 1990’s approaches.Fourdifferent approaches showed a trend of evaluating characteristic values conservatively with increasing soilvariability.Geotechnical stability and settlement of a breakwater, subjected to nominal stress on unimproved softground, were studied to investigate the effects of the estimated different characteristic values.Using Schneider’sapproach, the ratio of allowable bearing capacity to acting loads was 65% of that based on the arithmetic meanvalues, and the settlement was underestimated by 13.6%. It was also found that determining a representativevalue using an arithmetic mean value significantly overestimated the ratio comparing the values using theproposed approaches, which may induce an uneconomic design of structure if not considering serious soilvariability owing to insufficient test data.