刚性桩复合地基沉降计算方法的探讨

Discussion about calculation methods for settlement of rigid-pile composit foundation

通过工程实例对刚性桩复合地基沉降的三种计算方法(规范的CFG桩法、龚晓南法、双层应力法)进行对比、分析,得出利用规范CFG桩法计算的沉降量与实测沉降量比较贴近,但是,其加固区复合模量计算方法的根据有待完善;龚晓南法给出的桩端刺入下卧层的变形量目前尚没有充足的依据;双层应力法在理论上比较合理,但在实际应用上,应力水平系数不易准确确定。通过本文的分析,提出对于桩端下卧层承载力较高的地基,应采用规范的CFG桩法计算复合地基的沉降。

<Abstrcat>This article makes a comparison and analysis about three calculation methods for settlement of rigid-pile composit foundation through an actual engineering examples. It is found that the settlement calculated by CFG-pile method is closed to that of the field measured, but its theoretical basis needs to be improved. The deformation that the piles spur into the substratum proposed by professor Gong Xiao-nan can not be calculated at the present. Two-layer stress method is reasonable in theory, but the stress coefficient can not be determined.It is suggested that the CFG-pile method conforms to reality to calculate the settlement of the rigid-pile composit foundation if the strength of the soil is enough at the bottom of the pile.