开口钢管桩沉桩阻力研究

Research of pile-sinking resistance of small aperture opening steel pipe pile

为得到小直径开口钢管桩的沉桩阻力计算公式,对开口钢管桩的土塞效应、挤土效应和软化效应进行了分析,结合静力触探原理,提出了沉桩阻力计算公式,将沉桩过程分为土塞闭合前后两个阶段,分别计算了桩侧阻力和桩端阻力的拟合系数,得到了小直径开口钢管桩的两阶段沉桩阻力计算公式。与工程实际测试数据符合较好。结果为黄河冲积平原粉土土质的坑式钢管静压桩提供了工程参考。

To get the pile-sinking resistance calculation tormula ot smart aperture opening steer pipe pile,the plugging effect,squeezing effect and strain softening effect of open ended steel pipe pile are analyzed. The pile-sinking resistance formula is proposed combined with cone penetration test, the pile-sinking process is divided into two stages：before and after inner soil blocked, and the fitting coefficients of pile side resistance and pile tip resistance are calculated respectively, and the two stages pile-sinking resistance calculation formula of small aperture opening steel pipe pile is obtained. The results fit the test dates in engineering wen. The research results can provide reference to pit-jacked steel pipe pile in Huanghe alluvial plain silt soil.