LIQUEFACTION and POST LIQUEFACTION SETTLEMENT ASSESSMENTA Form

Instructions and help about LIQUEFACTION AND POST LIQUEFACTION SETTLEMENT ASSESSMENTA

what is liquefaction liquefaction is a phenomenon that occurs when loose saturated cohesionless soils lose their shear strength and stiffness and behave as quicksand during an after a seismic event during earthquake shaking loose silts and sands tend to densify into a tighter configuration in cases where these soils exist above the water table this densification results in small volume changes but no loss of bearing capacity or shear strength however when loose silts and sands are located below the water table and are saturated liquefaction can be a concern because water is essentially incompressible any densification of these soils due to a seismic event results in an increase in pressure in the pore water between the soils grains when this pore water pressure reaches approximately 60% of the soil strength lose silts and sands can lose grain to grain contact and liquefy this phenomenon can have catastrophic effects on both above and below ground structures liquefaction can result in b