Characterization of collapsible gypsum sand soil with the presence of matric suction using a modified odometer apparatus

This study looks into the influence of matric suction on volume change gypsum sand soil in unsaturated conditions. The specimens were collected from Al-Najaf, Iraq, and included 14 29% gypsum. Three series initial stress laboratory tests utilized a modified oedometer device. For each content, twelve remolded examined circumstances with applied using four matrices (30 kPa, 18 9 saturated state). performed for suctions stresses, no load, 56 112 respectively. findings exhibit clear pattern increase vertical strain as content rises reduces under variety situations. wetting process softens components, which are significantly resulting an strains.