Abstract
The effect of wheeling speed on the consecutive stress/strain, time-dependent settlement behaviour and load-dependent change of the air permeability of a Typic Paleustalf were investigated. In the field the soil was wheeled with different forward speeds (up to about 8 km h −1) at two water content ranges (close above or below the lower plastic limit). Undisturbed soil samples of these prestressed soil plots were taken thereafter and equilibrated at 100 hPa water suction prior to experimentation in the laboratory. The slower the wheeling speed in the field had been (i.e. the longer the soil had been precompressed) the higher was the preconsolidation load value and the ratio of the initial (= timeless) to total settlement at constant load, determined in the confined compression test under static loading in the laboratory. The lower the water content was during the primary loading period in the field, the smaller was the decrease in air permeability caused by secondary static loading of the predried soil samples. However, the decrease with load was more pronounced if speed during wheeling was higher. These differences are explained with time-dependent processes of particle and soil structure rearrangement, which also include load-dependent changes in pore continuity and hydraulic conductivity.
Published Version
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