JEOTEKSTİL TABAKALARININ ÇAKIL-SİLT KARIŞIMLARININ TAŞIMA KAPASİ-TESİ ÜZERİNDEKİ ETKİLERİ

Soil stabilization methods to modifying and improving the physical and engineering features of the soil for achieving a set of previously determined goals. In many engineering applications, the use of geotextiles is regarded as an effective method for soil improvement. Research results indicate that, when geosynthetics placed between the subgrade and sub base layers, increase the bearing capacity in fine grain subgrades. The main pur-pose of the present study was evaluating a laboratory study of the effect of geotextile layer and its number of lay-ers on the bearing capacity of the gravel of Til region of Shabestar city, which includes 15 to 30 percent of silt. It should be noted that the mentioned tests were performed in three relative densities of 90, 95, and 100%, and the effect of geotextile layer was studied in two positions. In the first position, one geotextile layer was placed in the middle part of the soil sample, and in the second position two geotextile layers were alternatively placed in the samples. The results of laboratory studies show that putting one geotextile layer in samples helps modify and im-prove the bearing capacity. This increases were observed in the gravel and the gravel with 30% silt. However, putting two geotextile layers in the soil alternatively decreases resistance and bearing capacity of the samples.