THE EFFECT OF RECONSOLIDATION ON UNDRAINED STRENGTH OF NORMALLY CONSOLIDATED COHESIVE SOILS

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The effect of reconsolidation on the undrained strength was experimentally studied for cohesive soils subjected to disturbance due to stress release and sample preparation. Three types of cohesive soils were used; Kawasaki clay with plasticity index of about 50 and two artificial mixtures of Kawasaki clay and Toyoura sand with plasticity index of about 20 and 10. Reconsolidation pressures employed were approximately 0.5,1,2 and 4 times the preconsolidation pressure of 98 kN/m^2. Pore pressures were monitored by an embedded transducer during the whole stages of preconsolidation, stress release, sample preparation, reconsolidation and shear tests. It was found that soils with lower plasticity indices were more susceptible to disturbance, showing the loss in undrained strength of 50 to 60% of original strength. With respect to the relationship between the void ratio and consolidation pressure, the reconsolidation pressure four times the preconsolidation pressure did not completely bring the trimmed specimens back to the normal consolidation state. The undrained strength increased and the strain at the maximum deviator stress decreased with the increase in reconsolidation pressures. Even at the reconsolidation pressure four times the preconsolidation pressure the effect of disturbance did not vanish for the ratio of undrained strength of reconsolidated specimen to that of ideal samples, while for the effective stress paths the effect was almost negligible. The ratio of increase in undrained strength with consolidation pressure of trimmed specimens became nearly equal to that of ideal samples at the reconsolidation pressure twice the preconsolidation pressure
社団法人地盤工学会の論文
1983-09-15

THE EFFECT OF RECONSOLIDATION ON UNDRAINED STRENGTH OF NORMALLY CONSOLIDATED COHESIVE SOILS

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