Application of Unsaturated Constitutive Model to Estimation of Land Subsidence

摘要

Drawdown of groundwater table causes change of net mean stress and matric suction in unsaturated soil and then induces volume change of the soil mass.Based on test results,using the Fredlund constitutive model and effective stress theory, subsidence of unsaturated soil zone and saturated zero are estimated respectively for different drawdown depth.Computed results indicated that in total amount of subsidence.The portion of subsidence of unsaturated soil zone cannot be overlooked.The contributions of unsaturated soil zone to total subsidence increased as drawdown depth increases.