《Journal of Geotechnical and Geoenvironmental Engineering》杂志刊登“采用静力触探试验研究挤土桩在粘土的桩侧承载力”

作者：Barry M. Lehane; Yunong Li; and Ryan Williams

刊物：《Journal of Geotechnical and Geoenvironmental Engineering》，2013年2月，139卷第2期，253–266页

关键词：桩身；摩擦力；位移；桩；粘土

摘要：目前对粘土中挤土桩桩侧承载力的预测依然全部依靠经验或半经验的方法。本文根据现有桩试验数据库的扩展版本对五种常用方法的预测能力进行了检验。结果表明，计算所得的承载力与实际测得承载力之比(Qc/Qm)的系数变动(COVs)要远远高于预期。接着利用桩侧承载力数据库检验局部桩侧摩擦力和静力触探试验锥尖阻力(qt)之间的可能关系。随后将预测值与一系列离心试验中所测的承载力值以及两个得到很好验证的原位试验中峰值摩擦力的分布进行比较。与通过现有的经验方法所得的经验公式大有不同，但这些经验公式给出的Qc/Qm之比的系数变动值却大体上相似，并且得到如下结论，如果要提高粘土中桩侧承载力估计的可靠性，则应对高质量桩试验数据库进行扩展。

Shaft Capacity of Displacement Piles in Clay Using the Cone Penetration Test

Authors: Barry M. Lehane; Yunong Li; and Ryan Williams

Journal: Journal of Geotechnical and Geoenvironmental Engineering, Volume 139, Issue 2 (February 2013), 253–266

Key words: Shafts, Friction, Displacement, Piles, Clays

Abstract: The prediction of the shaft capacity of displacement piles in clay still relies wholly on empirical or semiempirical approaches. This paper examines the predictive abilities of five well-known methods against an extended version of an existing database of pile tests. It is seen that coefficients of variation (COVs) of the ratio of calculated to measured capacities (Qc/Qm ) are significantly higher than expected. The paper then uses the database of shaft capacities to examine potential relationships between local shaft friction and the cone penetration test end resistance (qt). Predictions are subsequently compared with capacities measured in a series of centrifuge tests and with the distributions of peak frictions observed in two well-documented field tests. Widely different formulations adopted by each of the existing empirical methods give broadly similar COV values for Qc/Qm ratios, and it is concluded that the database of high-quality pile tests needs to be expanded significantly if the reliability of estimates of shaft capacity in clay is to be improved.

原文链接：http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000749