Changes of permeability and preconsolidation pressure compacted clayey soils depending on the compaction energy

This study has been prepared as an MSc. Thesis at the Department of Geology in the Institute of Natural and Applied Sciences, University of Cukurova in the academic year of 2011-2012.In this study changes in engineering parameters such as permeability and preconsolidation pressure due to application of the compaction energy, one of the important parameters of compaction, in different proportions have been investigated. Undisturbed clay samples obtained from the Sam-Tekin clay quarry, where the clay core material of the Ataturk Dam was taken, have been used in the study. In order to classify the samples, Atterberg Limits, grain size analysis and specific gravity tests have been performed. The maximum dry unit weights and optimum moisture contents of compacted samples for 5 different compaction energies (15, 25, 35, 45, 55 blows) have been determined by means of compaction tests. Permeability and consolidation tests have been performed on sub-samples taken from the compaction samples compacted at the determined maximum dry unit weights and optimum moisture contents. In conclusion, it was determined that as the compaction energy increases, the dry unit weight and preconsolidation pressure increase and the optimum moisture content, void ratio and permeability decrease.