Behavior of the entrapped air in compacted soil and its effects on soil mechanical properties

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Soil compaction is an important work when constructing earth structures. The entrapped air in compacted soil has a high pressure just after the compaction and affects the pressure of water and other mechanical properties of the soil. In this study change in water pressure which is caused by entrapped air pressure was observed. A method which determines the pressure and the volume of the entrapped air was devised. It was revealed that the air pressure is higher than the water pressure a little. Based on such a fact, it will be possible to develop a model and analyzing method for a phenomenon that water is forced out from compacted soil.