Influences of elastic modulus of pile on negative skin friction behaviors under the surcharge load

The influences of elastic module of pile on negative skin friction (NSF) is simply analysed. Elastic compression deformation of pile is a key component of displacement at pile top in low elastic module piles. The influences of elastic compression of pile on load-transferring are evident in such cases. For low elastic module piles which are often used in composite foundation, have to take compression deformation of piles into account in analysis of pile-soil interaction. Finite element analysis shows that elastic module of pile that affects NSF exists a critical value. Influences of elastic module of pile on NSF can be neglected when elastic module of pile is greater than the critical value. Compression deformation of pile body increases while elastic module of pile is lower than the critical value. It makes the neutral point in pile move up and the maximum additional stress in pile play down. These changes become more evident as lowering elastic module of pile.