Experimental study on wetting deformation of remolded cohesive soil under constant pressure
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Abstract:
This study investigated the influences of initial void ratio, stress, and initial water saturation on the wetting deformation of remolded cohesive soil under constant pressure using the conventional consolidation apparatus. The experimental results showed that the stress and initial void ratio e had significant impact on the wetting deformation. Under low stress, the deformation changed from expansion to shrinkage with the increase of e; while under high stress, all the samples were compressed and the amount of compression would increase with the increase of e. The relationships among wetting deformation, stress, and e were analyzed quantitively. The wetting stability time t0 was affected obviously by the stress and e. The t0 would increase with the increase of stress. Under low stress, t0 would increase with the increase of e; under high stress, t0 would increase first and then decrease with the increase of e. The initial water saturation Sr also had great influences on the wetting deformation. Under low stress, the swelling capacity would decrease first and then increase with the increase of Sr; the "optimum initial water saturation" may exist, which can lead to the smallest deformation. Under high stress, the amount of compression would decrease with the increase of Sr, and their relationship was approximately linear.
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