과압밀점토의 간극수압계수에 응력이력과 시간이력이 미치는 영향

Abstract

This study investigated the effects of stress and time history of overconsolidated clayey soils onpore pressure parameter, A. Laboratory tests were carried out under the conditions of both varying stres and timehistory. The stres history is classified into (i) rotation angle of stress path, (ii) overconsolidation ratio, and (iii)magnitude of length of recent stres path. The time history is divided into (i) loading rate of recent stress path and(ii) rest time. Pore presure parameters are different both in the magnitude and trend with the rotation angle,depending on the magnitude of overconsolidation ratio but not in a trend. In addition, the pore pressureparameters have no effects on the magnitude of length of recent stres path except the level of initialy smalstrain, while loading rates of recent stress path have efects on it. Finaly, the pore presure parameters ofoverconsolidated clays increase with the existence of the rest time, until either the deviator stress exceeds 70 Paor the strain up to 0.1%.