چكيده به لاتين
Lightening is used as a remediation method for construction projects on low load bearing land to reduce the load on the ground. The use of expanded polystyrene in this method, which is an ultra-lightweight material, has attracted the attention of experts and researchers. Expanded Polystyrene (EPS) is a polymer material used in food packaging, building industry, etc. Carbonate sands are one of the problematic soils in nature that sometimes pose problems for geotechnical engineers. Research on these sands has shown that the behavior of these soils under shear is different from that of silicate soils. The Persian Gulf is one of the places where carbonate soils are found in the world. Despite extensive research and experimentation in the field of silicate sand lightening by EPS, there is no research on carbonate sand lightening in the technical literature. In this research, using static triaxial apparatus, the properties and behavior of these materials in carbonate sand resistive parameters are investigated. At first, samples with 50% density were prepared by mixing 5%, 10%, 20% volumes of EPS grains (both small and large grains) with Bushehr carbonate sand, and mechanical properties of the composite were determined using a triaxial drilled consolidated test (CD). At four all-pressures of 50, 150, 250 and 350 kPa. The results of these experiments showed that, as stated in previous research, with increasing EPS incorporation percentage, the internal friction angle and shear strength decreased and the adhesion increased. However, the combination of larger grain size and EPS showed better behavior and reduced shear strength and friction angle compared to the sample containing fine grain EPS. Also, the specific gravity of samples with increasing EPS mixing percentage showed a significant decrease from 15.00 for pure sand to 13.40 for sand and 20% EPS mixing.
