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This paper presents an experimental investigation of leaching on the compressibility of sensitive Champlain Sea clay. Champlain Sea clay is prominent in eastern Canada, commonly found in the St. Lawrence River Valley. It has an open fabric structure formed during its deposition in sea water and tends to have a very high compressibility. A leaching apparatus was developed to flush fresh water through a 15 cm undisturbed clay sample and reduce the salinity from 19.81 g/L of pore fluid to 0.79 g/L in 83 days. A total of four constant rate of strain consolidation tests were conducted on unleached and leached clay samples. Based on the consolidation test results, a few minor changes were observed in the corresponding samples, including an increased sensitivity, a higher compression index, a reduced permeability, and a reduced coefficient of consolidation due to leaching. However, there are no significant differences in compressibility properties of Champlain Sea clay at these two salinity levels.
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