砂土地基中静压桩桩端阻力分析

Analysis of Pile End Resistance of Static-Pressure Pile in Sandy Foundation

利用自主研制的大型土工试验装置,在考虑桩长和桩尖角度影响的情况下,开展了静压桩的沉桩以及静载荷试验,以研究试验过程中桩端阻力的变化规律。试验结果表明:沉桩过程中,桩端阻力随沉桩深度的增加而非线性增大,也随桩长和桩尖角度的增加而增大,沉桩深度为25D时,桩端阻力基本达到极值,同一沉桩深度处桩端阻力在沉桩阻力中的占比随桩长(20D~30D范围内)的增加而减小,随桩尖角度的增加而增大;静载荷试验过程中,桩端阻力随沉降量的增加而非线性增大,也随桩长和桩尖角度的增加而增大,同一沉降量处桩端阻力在桩顶荷载中的占比随桩长的增加而减小,随桩尖角度的增加而增大。

In order to study the change rule of pile end resistance of the static-pressure piles,the sinking and static load tests were carried out by using the self-developed large geotechnical testing device,with the influence of pile length and pile tip angle considered.The results show that,the pile end resistance increases non-linearly with the increase of pile sinking depth,and it also increases with the increase of pile length and pile tip angle during the pile sinking.The pile end resistance reaches the extreme value when the pile sinking depth is 25D.The percentage of pile end resistance in the pile sinking resistance at the same depth decreases with the increase of pile length(within 20D~30D)and it increases with the increase of pile tip angle.During the static load test,the pile end resistance increases non-linearly with the increase of settlement,and it also increases with the increase of pile length and pile tip angle.The percentage of pile end resistance in the pile top load at the same settlement decreases with the increase of pile length,and it increases with the increase of pile tip angle.