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首页> 外文期刊>Journal of geotechnical and geoenvironmental engineering >Closure to 'Ultimate Shaft Friction and Load-Displacement Response of Axially Loaded Piles in Clay Based on Instrumented Pile Tests' by Kjell Karlsrud
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Closure to 'Ultimate Shaft Friction and Load-Displacement Response of Axially Loaded Piles in Clay Based on Instrumented Pile Tests' by Kjell Karlsrud

机译：凯尔·卡尔斯鲁德（Kjell Karlsrud）对“基于桩基测试的粘土中轴向荷载桩的极限轴摩擦和荷载-位移响应的闭合”的闭合

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摘要

The writer appreciates the comments and questions raised by the discusser. The main reason for the low shaft friction observed for low-plasticity clays is the low horizontal (radial) effective stress measured against piles installed in low-plastic clays and clays low in overconsolidation ratio (OCR). As an example, Fig. 1, taken from Karlsrud (2012), shows the measured normalized horizontal effective stress ratio, K_c = σ′_(hc)/σ′_(v0), versus plasticity index, I_p, for piles installed in clays with OCR ＜ 2. (σ′_(hc) = measured horizontal effective stress against the pile shaft, σ′_(v0) = in situ vertical effective stress). It shows that K_c approaches a value of 0.1 when I_p is less than about 12-15%, and becomes larger than 0.5 and in situ Ko when I_p is larger than about 20-40%. Although Karlsrud (2012) found some correlation between the measured ultimate shaft friction and the measured horizontal effective stress at onset of pile loading, the scatter in the data correlating the two was found too large to make it an attractive design approach.
机译：作者感谢讨论者提出的意见和问题。对于低塑性粘土，观察到的低轴摩擦的主要原因是针对安装在低塑性粘土中的桩和过固结比（OCR）低的粘土测得的水平（径向）有效应力低。例如，取自Karlsrud（2012）的图1显示了测量的归一化水平有效应力比K_c =σ′_（hc）/σ′_（v0）与可塑性指数I_p的关系， OCR ＜2的粘土。（σ'_（hc）=测得的对桩身的水平有效应力，σ'_（v0）=现场垂直有效应力）。它表明，当I_p小于约12-15％时，K_c接近0.1的值，而当I_p大于约20-40％时，K_c变得大于0.5并就地Ko。尽管Karlsrud（2012）发现桩荷载开始时测得的极限轴摩擦力与测得的水平有效应力之间存在一定的相关性，但发现两者之间相关的数据散布太大，无法使其成为一种有吸引力的设计方法。

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