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Observing friction fatigue on a jacked pile

机译:观察千斤顶桩的摩擦疲劳

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摘要

Calibration chamber testing combined with a new technique of displacement measurement using image analysis has allowed the penetration mechanism of a jacked pile to be quantified. Observation of soil adjacent to an advancing pile revealed movement towards the shaft. This movement is linked to 'friction fatigue'. The mechanism of this process is observed to be volume reduction in the boundary layer at the pile-soil interface combined with horizontal unloading in the far field. The possibility of replicating this behaviour in a constitutive or centrifuge model is discussed.
机译:校准室测试与使用图像分析的位移测量新技术相结合,可以对千斤顶的穿透机理进行量化。观察靠近前进的桩的土壤,发现其向竖井移动。这种运动与“摩擦疲劳”有关。观察到该过程的机理是桩-土界面处边界层的体积减小,以及远场中的水平卸载。讨论了在本构模型或离心模型中复制此行为的可能性。

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