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首页> 外文期刊>Canadian Geotechnical Journal >Time effects on shaft capacity of jacked piles in sand
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Time effects on shaft capacity of jacked piles in sand

机译：时间对砂土中顶桩的​​竖井承载力的影响

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This paper examines the effects of time on the shaft capacity of jacked piles in sand through an experimental program performed at three separate test sites in Western Australia. A total of 18 instrumented pile tests were conducted to track the changes of radial stress on the pile shafts, as well as shaft friction, up to a maximum of 72 days after installation. The results confirm that the gains in shaft capacity of jacked piles are small after a period of about 1 day. This observation is in keeping with limited available case history data, but is in stark contrast to the significant capacity gains reported for driven piles. Further examination reveals that set-up effects for jacked piles in sand are relatively significant within one day of installation, and that the increased friction is associated primarily with larger increases in radial effective stress during shearing.
机译：本文通过在西澳大利亚州三个不同的测试地点执行的实验程序，研究了时间对顶桩在沙子中的竖井承载力的影响。总共进行了18次仪器化桩测试，以跟踪安装后最长72天的桩身径向应力以及桩身摩擦的变化。结果证实，经过约1天的时间后，千斤顶的竖井承载力增益很小。该观察结果与有限的可用案例历史数据保持一致，但与报告的打桩显着增加的产能形成鲜明对比。进一步的检查表明，在安装的一天之内，沙子中顶桩的设置效果相对显着，并且增加的摩擦力主要与剪切过程中径向有效应力的较大增加有关。

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