Geotechnical aspects of alluvial soils at different depths under sodium chloride action in Najran region, Saudi Arabia: Field supported by laboratory tests

The current research study is aimed at studying the impact of sodium chloride on performance semi-arid soils in Najran area Saudi Arabia. Experimental work has been undertaken to investigate how adding salt soil collected affects boundaries Atterberg, compaction characteristics, California bearing ratio, and shear strength. All testing was conducted samples from different zones varying depths 1.5, 3, 4.5 m along profiles. were analyzed individually then compared with same mixed NaCl percentages 5, 10, 20% by weight dry soil. Using advanced techniques, such as scanning electron microscope, energy dispersive x-ray analysis, X-ray diffraction stabilization process examined. findings revealed that significantly impacts geotechnical characteristics soils. maximum density increased 1.995, 1.93, 1.96 2.02, 1.99, 2.03 g/cm 3 , optimal water content decreased 9.47, 13.7, 11.29 7.01, 9.58%, 8.09% added various depths, respectively. Shear resistance parameters improved NaCl, where cohesion 0.1333, 0.0872, 0.0533 0.1843, 0.1034, 0.0372 kg/cm 2 angle internal friction 24°, 25.5°, 29° 27.8°, 30°, 33°, liquid plastic limits and, turn, plasticity index reduced percentage increased. Furthermore, ratio reached more than 50%. As a result, it established an excellent stabilizer, especially concentration, might be used sub-base substance highway construction.