Effects of compaction moisture content on the shear strength of an unsaturated clay |
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Authors: | E Cokca O Erol F Armangil |
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Institution: | (1) Department of Civil Engineering, Middle East Technical University, 06531 Ankara, Turkey |
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Abstract: | This paper deals with the results of an experimental study carried out on compacted clay (PL=23%) to investigate the influence
of compaction water content on the shear strength of the clay. For the measurement of shear strength parameters, direct shear
tests were done on samples compacted at optimum moisture content (i.e. w=24%), at the dry side of optimum (i.e. w=18%, 20% and 22%) and at the wet side of optimum (i.e. w=26% and 28%). Thermocouple psychrometers were used for suction measurements and the suction-moisture content relationship
of the soil sample was obtained. The trends for suction, angle of friction and cohesion, which change below and above optimum
moisture content, were analyzed. The compacted clay behaves like a granular soil on the dry side of optimum water content;
and a reduction in angle of friction and an increase in cohesion are observed as the compaction water contents approach the
optimum value. The angle of friction is not affected by soaking, but after soaking cohesion of the sample reduces.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | angle of friction cohesion compacted clay suction unsaturated soil |
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