开口钢管桩沉桩阻力研究
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摘要
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 formula of small aperture opening steel 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 well.The research results can provide reference to pit-jacked steel pipe pile in Huanghe alluvial plain silt soil.
To get the pile-sinking resistance calculation formula of small aperture opening steel 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 well.The research results can provide reference to pit-jacked steel pipe pile in Huanghe alluvial plain silt soil.
引文
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[6]张明义,刘俊伟,王静静,等.计算静压桩沉桩阻力的综合调节系数法[J].重庆建筑大学学报,2007,29(6):35-38.
[2]王哲,龚晓南,丁洲祥,等.大直径薄壁灌注筒桩土芯对承载性状影响的试验及其理论研究[J].岩石力学与工程学报,2005,24(21):3916-3921.
[3]JGJ94—2008建筑桩基技术规范[S].
[4]韩选江.静压桩的压桩力和承载力的试验研究[J].建筑结构学报,1996,17(6):71-77.
[5]储王应,王能民.静力压桩沉桩阻力分析与估算[J].岩土工程技术,2001,1(6):25-28.
[6]张明义,刘俊伟,王静静,等.计算静压桩沉桩阻力的综合调节系数法[J].重庆建筑大学学报,2007,29(6):35-38.
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