Abstract
A new differential pore pressure manometer has been used to record pore pressure at the center of the specimen. Gibson’s theoretical analysis for time lag in base pore pressure is confirmed experimentally. Empirical equations are developed to predict time lag in pore-pressure measurement at the base as well as the center of the specimen. The technique of pore-pressure measurement by various kinds of probes is examined. Two sources of error—(1) choking of filter tip and (2) difference of ionic concentration in pore water and water in lead—are noted and remedial procedure suggested.
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