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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Field Test of Excess Pore Water Pressure at Pile–Soil Interface Caused by PHC Pipe Pile Penetration Based on Silicon Piezoresistive Sensor
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Field Test of Excess Pore Water Pressure at Pile–Soil Interface Caused by PHC Pipe Pile Penetration Based on Silicon Piezoresistive Sensor

机译：基于硅压阻传感器的PHC管桩穿透引起桩-土界面超孔隙水压力的现场测试

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摘要

Prestressed high-strength concrete (PHC) pipe pile with the static press-in method has been widely used in recent years. The generation and dissipation of excess pore water pressure at the pile–soil interface during pile jacking have an important influence on the pile’s mechanical characteristics and bearing capacity. In addition, this can cause uncontrolled concrete damage. Monitoring the change in excess pore water pressure at the pile–soil interface during pile jacking is a plan that many researchers hope to implement. In this paper, field tests of two full-footjacked piles were carried out in a viscous soil foundation, the laws of generation and dissipation of excess pore water pressure at the pile–soil interface during pile jacking were monitored in real time, and the laws of variation in excess pore water pressure at the pile–soil interface with the burial depth and time were analyzed. As can be seen from the test results, the excess pore water pressure at the pile–soil interface increased to the peak and then began to decline, but the excess pore water pressure after the decline was still relatively large. Test pile S1 decreased from 201.4 to 86.3 kPa, while test pile S2 decreased from 374.1 to 114.3 kPa after pile jacking. The excess pore water pressure at the pile–soil interface rose first at the initial stage of consolidation and dissipated only after the hydraulic gradient between the pile–soil interface and the soil surrounding the pile disappeared. The dissipation degree of excess pore water pressure reached about 75–85%. The excess pore water pressure at the pile–soil interface increased with the increase in buried depth and finally tended to stabilize.
机译：近年来，采用静压法的预应力高强混凝土管桩已得到广泛应用。在顶桩过程中，桩-土界面处多余的孔隙水压力的产生和消散对桩的机械特性和承载力有重要影响。另外，这可能导致不受控制的混凝土损坏。许多研究人员希望实施一项在桩顶过程中监测桩-土界面多余孔隙水压力变化的计划。本文在黏性土壤基础上对两个全脚架桩进行了现场测试，实时监测了顶桩过程中桩-土界面处多余孔隙水压力的产生和消散规律，并据此规律进行了研究。分析了桩-土界面处的多余孔隙水压力随埋藏深度和时间的变化。从测试结果可以看出，桩-土界面处的多余孔隙水压力先升至峰值，然后开始下降，但下降后的多余孔隙水压力仍然相对较大。顶桩后，测试桩S1从201.4降至86.3 kPa，而测试桩S2从374.1降至114.3 kPa。桩-土界面处的多余孔隙水压力在固结初期首先上升，并且仅在桩-土界面与桩周围土壤之间的水力梯度消失后才消散。多余孔隙水压力的耗散程度达到约75-85％。桩-土界面处的多余孔隙水压力随着埋深的增加而增加，并最终趋于稳定。

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