堆载作用下端承桩负摩阻力分析

Analysis on negative skin friction of end bearing pile under surface load

基于有限元模拟桩土相互作用,简要分析了大面积堆载作用对端承桩桩身负摩阻力大小及中性点位置的影响,指出桩基负摩阻力随桩周土体固结时间的增长而增大,中性点位置随固结时间的增大而不断加深,随着堆载的增加,桩身承受的负摩阻力随之增加、中性点位置逐渐加深,而且负摩阻力引起的桩身附加轴力也随之增大。

Based on finite element analysis on pile-soil interaction by means of ADINA simulation,the effect of large-area surface load on negative skin friction and neutral point was analyzed. It was shown that the position of neutral point of pile shaft varied with the consolidation time of surrounding soil and the magnitude of surface load. The results also show that negative skin friction of pile increases with the consolidation time under heaped load,and the neutral point decreased thereupon. Furthermore,with the increasing of the surface load,the position of neutral point obviously tends to deepen and axial force increases.