Fabric change in a volcanic soil due to disturbance estimated by MIP

摘要

Mercury Intrusion Porosimetry was applied to study for characterization of pore structure in volcanic soil containing different two types of pore, inter-aggregate and intra-aggregate pores. Fabric change was discussed on the basis of pore size distribution of undisturbed, compacted and disturbed samples. Some indices easily calculated from pore size distribution were used in evaluation of fabric change due to disturbance or compaction. A new technique called as the double intrusion method was applied to the measurements. The study concludes that two successive intrusion is available in evaluation of pore structure for aggregated soils, entrapped pore takes an important role on characterization of fabric in aggregated soils, and specific surface area, which is redefined as surface area to volume of mercury intruded, drastically increases by disturbance or compaction and shows a good relation to volume rate of pores with radius less than 0.1μm.