竖向荷载作用下桩身压缩系数分析研究
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摘要
对比分析多个工程项目中实测桩身压缩系数与建筑桩基规范中给出的压缩系数,发现实际桩身压缩系数与规范值偏差较大,分析了影响桩身压缩系数的因素,通过引用竖向荷载作用下的单桩桩身轴力分布函数,推算出只与桩的长径比和端阻分担比相关的桩身压缩系数计算公式,为桩基设计和施工提供了一定的理论参考。
The pile head settlement consists of the compression value of pile shaft and the soil settlement at the pile tip.The coefficient of the pile shaft compressibility is a critical parameter of in determining the pile shaft compressibility.This paper compares the measured coefficients pile shaft compressibility with the values that recommended by the construction code.It is concluded that the measured values might significantly different from the code recommended values.Factors that affecting the coefficient of the pile shaft compressibility are evaluated and the vertical load transfer function along the pile shaft is introduced to estimate the coefficient of pile shaft compressibility using the ratio of pile length to diameter and ratio of pile head loading to tip loading.
The pile head settlement consists of the compression value of pile shaft and the soil settlement at the pile tip.The coefficient of the pile shaft compressibility is a critical parameter of in determining the pile shaft compressibility.This paper compares the measured coefficients pile shaft compressibility with the values that recommended by the construction code.It is concluded that the measured values might significantly different from the code recommended values.Factors that affecting the coefficient of the pile shaft compressibility are evaluated and the vertical load transfer function along the pile shaft is introduced to estimate the coefficient of pile shaft compressibility using the ratio of pile length to diameter and ratio of pile head loading to tip loading.
引文
[1] Kezdi A.The bearing capacity of piles and pile groups.Proc.Of 4th ICSMFE,1957(2):46-51.
[2] Cooke R W,Price G etc.Jacked piles in Lon-don clay:interaction and group behaviour under working conditions[J].Geotechnique,1980,30(2):97.
[3] POULOS H G,Settlement prediction for bored pile groups[C].Proceedings of the 2nd International Geotechnical Seminar on Deep Foundations on Bored and Auger Pile.Ghent,1993.
[4]中华人民共和国行业标准,建筑桩基技术规范(JGJ 94-2008)[S].北京:中国建筑工业出版社,2008.
[5]蒋建平.超长灌注桩桩身压缩综合系数反分析[J].岩土力学,2008(9):2469-2475.
[6]秋仁东.竖向荷载下桩身压缩和桩基沉降变形研究[D].北京:中国建筑科学研究院,2011.
[7]梁金国.后压浆旋挖钻孔灌注桩单桩竖向承载力分析[J].岩土工程技术,2008(3):140-144.
[8]梁金国,丁继辉,等.基于桩轴力分布函数的单桩承载特性分析[J].岩土工程技术,2015,29(6):306-310.
[2] Cooke R W,Price G etc.Jacked piles in Lon-don clay:interaction and group behaviour under working conditions[J].Geotechnique,1980,30(2):97.
[3] POULOS H G,Settlement prediction for bored pile groups[C].Proceedings of the 2nd International Geotechnical Seminar on Deep Foundations on Bored and Auger Pile.Ghent,1993.
[4]中华人民共和国行业标准,建筑桩基技术规范(JGJ 94-2008)[S].北京:中国建筑工业出版社,2008.
[5]蒋建平.超长灌注桩桩身压缩综合系数反分析[J].岩土力学,2008(9):2469-2475.
[6]秋仁东.竖向荷载下桩身压缩和桩基沉降变形研究[D].北京:中国建筑科学研究院,2011.
[7]梁金国.后压浆旋挖钻孔灌注桩单桩竖向承载力分析[J].岩土工程技术,2008(3):140-144.
[8]梁金国,丁继辉,等.基于桩轴力分布函数的单桩承载特性分析[J].岩土工程技术,2015,29(6):306-310.