Characteristics of Artificial, Gypsified and Natural Gypseous Soils under LeachingCondition


The gypseous soil known as a problematic soil with a collapsibility behaviour, three types of gypseous soils are prepared (artificial, gypsified and natural gypseous soil), special manufactured leaching system used for testing the soil models, the main objectives of this study are testing the soil models in dry and leaching conditions for measuring earth and pore water pressures with displacements andgypsum dissolved of the soil models under monotonic and repeated loads within relatively large physical model. The results at leaching process for three days revealed that the natural and gypsified soils have earth pressures reach about (150 kPa) and (4 to 4.5 cm) for displacements, while pore water pressure increased until reaches about (120 kPa), but for artificial gypseous soil, earth pressures reaches about (300 kPa) and (1 cm) for displacements. TDS and SO3 content measured and reaches to about (1900 ppm) for gypsified and natural soils while reaches about (350 ppm) for artificial gypseous soil. STATISICA program used to verify the results with a very good agreement reaches to 95% of the statistical models