練り返し過圧密粘性土の低応力下でのダイレタンシー・強度特性

Abstract

Shear characteristics of remoulded overconsolidated clay are studied with particular attentionto the dilatant behaviour under low effective stress level. Have been done p-const. Drained com-pression tests, p-const. Drained loading-unloading tests and consolidated undrained compressiontests. These test results show us that:I)exists the limit of stress ratio above which dilatant behaviour becomes obvious, but enenbelow which a little dilatant volumetric strain occurs, ii)within this limit of stress ratio, the equation which describes the dilatant volumetricstrain was represented, iii)it was clarified that, within the limit of dilatancy, dilatant volmetric strain is completelyirrecoverable, while shear strain is partly recoverable, iv)the possibility was pointed out that this limit would correspond to the upper yield valueof shear stress, v)under undrained condition, the importance of maximum stress ratio state was empha-sized from the view point of long term stability for remoulded O.C. clays based on theundrained effective stress path, vi)has been obtained the experimental result that the maximum stress ratio increases withthe decrease of mean effective stress even for the same value of O.C.R., particularly inthe case of high O.C.R., andvii)results of pre-consolidation process made us possible to analyze isotropic compression-swelling-recompression curves, in which non-linearity of w-ln Pc relation was takenaccount.