Experiment study on the coupling effect of initial void ratio-saturation degree-burden pressure on the swelling deformation of compacted soil

• 1、Three Gorges Research Center for Geo-hazard, Ministry of Education,China University of Geosciences,Wuhan 430074

Abstract：A series of swelling tests were conducted on the typical weak expansive soils from Anyang district. Before testing , all specimens were submitted to being compacted at the differential moisture content and dry density that corresponds to the various initial void ratios and saturation degree. Several burden pressures were applied to the swelling test. The coupling effect of initial void ratio-saturation degree-burden pressure on the swelling deformation of compacted soil was then analyzed. The test results indicated that A unified expression can be proposed to evaluate the swelling deformation for the specimens at a specific initial void ratio range .The final swelling depends on the two factors, i.e. the volume of water absorbed during swelling and the exchange degree between the water and air in soil pore. It can be concluded that the above two impacting factors increase as the initial saturation degree of soil and vice versa.

Keywords： geotechniacl enginnering Compacted expansive soil swelling deformation coupling effect initial parameters