FACTORS AFFECTING THE MEASUREMENT OF VOLUME CHANGE OF COHESIVE SOILS IN DRAINED TRIAXIAL TESTS

Abstract

The rate of evaporation of water in a burette and the compressibility of filter materials used as side drains are examined among experimental problems in the usual procedure for the measurement of volume change of cohesive soils in drained triaxial tests. The effects of change in room temperature on the measured volume change is also investigated and discussed.The compressibility of a filter paper is found to be a more important factor than others because no one can avoid the effect especially in drained triaxial tests with varying cell pressure. The compressibility of a filter paper, however, can be evaluated; a way to evaluate it is proposed by finding a linear relation between the volume of water drained from the filter paper and cell pressure in log scale for the rebound-recompression portion obtained from compression tests of the filter paper in a triaxial cell.