Canadian Geotechnical Journal, Ahead of Print.
The influence of bitumen coating on the development of unit shaft resistance along driven steel and precast concrete piles resulting from subsiding surrounding soft soil (gyttja) induced by fill placement at terrain was investigated. All piles were instrumented with conventional discrete-point vibrating wire strain gauges and distributed fibre optic sensors to achieve high-resolution strain measurements. The magnitude of the mobilised unit shaft resistance along uncoated piles was observed to be primarily related to an increase in effective stress resulting from the dissipation of excess pore water pressures. The unit shaft resistance along bitumen-coated piles was found to be primarily related to the rate of relative movement between pile and soil, which highlights the effectiveness of bitumen coating in reducing shaft resistance.

中文翻译：

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沉降土中沿打入桩的单位轴阻力的发展

加拿大岩土工程杂志，印刷前。
研究了沥青涂层对沿驱动钢桩和预制混凝土桩的单位轴阻力发展的影响，该阻力是由于地形上的填土引起的周围软土（gyttja）下沉而产生的。所有桩都配备了传统的离散点振弦应变计和分布式光纤传感器，以实现高分辨率应变测量。据观察，沿未涂层桩的移动单元轴阻力的大小主要与由于多余孔隙水压力的消散而导致的有效应力的增加有关。研究发现，沿涂沥青桩的单位轴阻力主要与桩与土之间的相对运动速率有关，这凸显了沥青涂层在降低轴阻力方面的有效性。