International Science and Technology Journal

Soil (A-3) is one of the types of sandy soils that cover large areas along the coastal strip from Misurata in the east to Ras Ajdir in the west. This soil has several major defects, including the difficulty of its compaction, its susceptibility to water erosion and wind erosion easily, its disintegration, non-coherence, and its sensitivity to vibrations are high. In this paper, we will address the topic of treating the engineering defects of the soil (A-3) using the remnants of the quarries of the Gargarish Formation available along the Libyan coasts located west of the city of Tripoli, where these residues are added to the soil (A-3) in certain proportions to obtain a mixture soil that has good engineering properties The aim of this research is to study the possibility of improving the engineering properties of soil (A-3) and to find the optimal ratio for this mixture that achieves the engineering and economic purposes. In order to achieve the required objective of his research, a laboratory study was carried out that included determining the volumetric characteristics, compaction properties (optimal water content and maximum dry density), California loading ratio and shear strength axes for submerged and unsubmerged samples for each of (A-3) soils and quarry wastes. Gargarish Formation and mixed soil in different proportions. The laboratory results indicated the possibility of improving the engineering properties of soil (A-3) by using the remnants of the Gargarish Formation quarries. Where the results indicated that the maximum dry density increases significantly with the increase in the percentage of the added material, as well as with regard to the mechanical properties of the soil, it was observed that the loading percentages of California increased clearly with the increase in the percentage of the added materials, as the value (CBR) of the submerged samples increased to 27% at the percentage of additions of 30 % instead of 7% for the original soil (A-3), and from these results it is possible to determine the appropriate added percentage for soil treatment (A-3), which ranges from 20% to 30% of the tailings of the Qarqarish Formation quarries. Keywords: Soil (A-3), Soil treatment, engineering properties of soil