关键词: 地下水位下降, 饱和一非饱和沉降, 负摩阻力, 剪切路径

Abstract: Abstract：The working behavior of single pile with verical load in subsidence area during groundwater recession was studied through theoretical analysis．Based on the single-phase floWhypothesis and the Bishop unsaturated effective stress principle，a mathematical model which could reflect the settlement in both saturated zone and unsaturated zone was established incorporating the linear soil and water characteristic curve．Assuming that the load transfer function was ideal elastic-plastic for the pile- soil interface，shear strength of which increasing with depth，and hyperbolic model for pile endpoint，then，Q-Scurves，side friction stress along the pile were analyzed according to the shear displacement method during waterlevel fal1

Key words: waterlevel fall, saturated unsaturated settlement, negative friction, shear stress pat