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Abstract

For evaluation of mechanical properties of soils in a propper manner,to be used for design purposes,it is vital that these parameters be determined through laboratory tests performed on compacted soil specimens,possessing similar conditions as the soil in the field.Normally,the remolded soil specimens in laboratory are made by using dynamic compaction method (compaction of the soil in the mold using hammer drops), while, in the field conditions, soil is compacted by sheep's foot rollers which apply static compaction.In the present research, to evaluate and compare the effects of each compaction type on permeability and consolidation properties of fine-grained soils, three soil samples of CL-ML,CL and CH classification were taken.AlI samples were
compacted at different moisture contents and different relative densities using both dynamic as well static compactive efforts. Finally,the remolded specimens were tested for determination of permeability and consolidation properties. The results for the permeability tests indicated that statically compacted specimens are more permeable than the specimens compacted by dynamic method.By increasing moisture content and relative density, coefficient of permeability is reduced. According to the results of consolidation tests,by increasing liquid limit of the soil, coefficient of consolidation (Cv) is reduced and compressibility index (Cc) increased. Moreover, the specimens compacted
. by static method, had higher coefficient of consolidation and compression index compared to the dynamically compacted ones. Also,it was concluded that regardless of soil's physical properties, increasing moisture content and relative density, would reduce Cv and Cc of the specimens

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