刚性桩复合地基桩端向下卧层刺入量计算方法

刚性桩复合地基桩端向下卧层刺入量的计算,是研究荷载传递规律和沉降的重要组成部分,能够完善复合地基沉降理论。为了研究桩体向下卧层的刺入变形,对下卧层等效单元体进行了受力分析,提出了关于桩端刺入量的计算方法,并对影响因素进行了分析。分析结果表明:刺入量随桩端桩土应力比和下卧层厚度的增大而增大,随下卧层压缩模量、内摩擦角和置换率的增大而减小。最后通过与试桩试验的实测结果进行比较,证明了本文计算方法的适用性。

Research on Pile Penetration into Underlying Layer of Rigid Pile Composite Ground

As an important part of load transfer behavior and settlement, the research for pile penetration into underlying layer would improve and perfect the theory of composite ground. In order to research the pile penetration into underlying layer, we analyzed the equivalent unit of underlying layer and the rational method was obtained with the affected factors analyzed. The results show that the penetration increases with the pile-soil stress ratio or the underlying layer thickness, decreases with the increase of compression modulus, internal friction angle or replacement rate of the underlying layer. Finally, this method is verified by comparison of calculating penetration with the experimental values.