桩体材料弹性模量对桩基负摩阻力特性的影响

分析了桩体材料弹性模量对于桩基负摩阻力特性的影响,指出不同的桩体材料弹性模量会使得桩身压缩值不同,对于复合地基中常用的低弹性模量桩应当考虑桩身压缩对于桩基性状的影响。有限元分析结果表明,影响桩基负摩阻力特性的桩体材料弹性模量存在一个临界值。当桩体材料模量大于此值时,可以忽略桩身材料模量的影响;桩体材料模量小于此值时,桩身压缩变形增大,桩顶位移和桩端位移会有很明显的差异,会造成中性点位置上移,桩身中最大附加应力降低。这对复合地基中桩体负摩阻力特性的研究是有益的。

Influences of Young's Module of Pile on Negative Skin Friction Characters of Pile

The influences of Young's module of pile material on negative skin friction(NSF) characters are analysed.It is pointed out that changes of Young's module of pile material may cause changes of compressive deformation of pile.For low rigidity pile which often used in composite foundation,compressive deformation has to be taken into account.Finite element analysis shows that a critical value exists for Young's module of pile that affects NSF character.Influences of Young's module of pile on NSF character may be neglected when module of pile is greater than the value.When module of pile is lower than the value,compressive deformation of pile increases,differences of pile top deformation and pile toe deformation increase.It makes neutral point in pile move up and maximum additional stress in pile decreases,which may be useful to the research for NSF characters of low rigidity pile in composite foundation.