STUDY ON ESTIMATION OF RESIDUAL SETTLEMENT AND UNLOADING TIME

There are many methods that can be employed to calculate final settlement by field settlement curve,but no formula can be straightly employed to forecast residual settlement and unloading time under bounded unloading settlement velocity in soft soil treatment project.The settlement-velocity and post-construction settlement that include residual settlement and secondary consolidation settlement are very important for unloading standard.The secondary consolidation settlement is limited within certain range;the post-construction settlement is mainly controlled by residual settlement.In Asaoka method,the settlement-velocity in preloading anytime can be calculated by applying the relationship of settlement rate and residual settlement.Of course,the residual settlement and unloading time can also be computed,which is called“velocity method”.The relationship of logarithm and preloading time of settlement rate is linear,where the unloading time can be confirmed by the graph.The method is successfully applied to the fill seafront treatment project of Shenzhen—Hong Kong West Passage.