软土中桩基工后长期沉降的预测模型

Predicting model on long-term settlement after construction of pile foundation in soft clay

基于软土中桩基工后长期沉降的机理,采用理论分析和工程实际相结合的方法,提出适用于软土中桩基工后长期沉降的预测模型。研究结果表明:提出的预测模型和简化预测模型均可综合考虑地基土体的固结和蠕变,能很好地反映沉降发展的实际情况;但基于土体固结和蠕变对桩基工后沉降的影响程度,对非挤土桩基工后40 d后的实测沉降,可考虑选用简化预测模型进行预测,在其他情况下则宜采用未简化的预测模型进行预测。

On the basis of mechanism of long-term settlement after construction of pile foundation in soft clay,and combining theoretical analyses with engineering practice,the model applicable to prediction of long-term settlement after construction of pile foundation was put forward.The results show that the predicting model and the simplified predicting model can all take consolidation and creep behavior of soft subsoil into account and reflect the practical situation of settlement development well.But considering influencing degree between consolidation and creep behavior of soft subsoil on the long-term settlement of pile foundation,the application scope of the predicting models are advised.The simplified predicting model may be applied on the condition that actual measuring settlement data after construction for more than 40 d are selected just for non-squeezing pile foundation.As far as other circumstances are concerned,the non-simplified model is appropriate.