Abstract
One of the most important soil problems seen on fine-grained soils is the settlement problem. The primary consolidation settlement shows itself over time with the effect of water. Also, the settlement properties of soil change depending on the stress history. In this study, silt mixtures with three different sand percentages were prepared using the slurry sludge preparation method under 50kPa load, and pre-consolidation pressures were calculated by performing the oedometer experiment on the obtained samples. Using the collected oedometer data, the pre-consolidation pressures were calculated and compared by six different methods. As a result, the results equal to the vertical stress values applied for the three mixtures were obtained by Butterfield and Tavenas methods. Sand content was effective in Casagrande, Van Zelst, and Janbu methods, but not in Butterfield, Tavenas, and Shmertman.
Highlights
The Geotechnical discipline examines a structure with billions of years of geological history
In the Casagrande method, the increase in the sand content caused the reduction of the pre-consolidation pressure. 10% increase in the sand caused 1% decrease in pre-consolidation pressure
Mixes were prepared by adding different sand percentages to the silt, and samples were mixed with the water content 1.5 times the liquid limit, and samples were prepared by the slurry sludge method
Summary
The Geotechnical discipline examines a structure with billions of years of geological history. By performing standard consolidation experiments on these samples, the Casagrande method determined preliminary consolidation pressures He said that the total stress applied to both soils in the preload time of 2 seconds took over 60% as pre-consolidation pressure. Yılmaz et al investigated sand and zeolite's effect on clay soil's frontal consolidation pressure [7] They compared Casagrande and Sridharan's methods and stated that the pre-consolidation pressure values obtained were compatible with the methods. Another study investigated the effect of sample disturbance on the evaluation of pre-consolidation pressure of undisturbed saturated clays by using Schmertmann method [16] This was carried out by comparing the scars estimated from the consolidation test results with the pocket penetrometer readings for the same samples. At the end of the study, the preconsolidation pressures were calculated and compared using six different methods using the oedometer's data
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