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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Field Performance of Open-Ended Prestressed High-Strength Concrete Pipe Piles Jacked into Clay
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Field Performance of Open-Ended Prestressed High-Strength Concrete Pipe Piles Jacked into Clay

机译：开口预应力高强混凝土管桩挤入黏土的现场性能

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摘要

The behavior of open-ended pipe piles is different from that of closed-ended pipe piles due to the soil plugging effect. In this study, a series of field tests were conducted to investigate the behavior of open-ended prestressed high-strength concrete (PHC) pipe piles installed into clay. Two open-ended PHC pipe piles were instrumented with Fiber Bragg Grating (FBG) sensors and jacked into clay for subsequent static loading tests. Soil plug length of the test piles was continuously measured during installation, allowing for calculation of the incremental filling ratio. The recorded data in static loading test were reported and analyzed. The distribution of residual forces after installation and the effect on the bearing capacity were also discussed in detail. The test piles were observed to be in partially plugged condition during installation. The measured ultimate shaft resistance and total resistance of the test piles were 639 and 1180 kN, respectively. The residual forces locked in the test piles after installation significantly affected the evaluation of the axial forces, and thus the shaft and end resistances. It tended to underestimate the end resistances and overestimate the shaft resistances if the residual forces were not considered in the loading test. However, the residual forces did not affect the total bearing capacity of open-ended PHC pipe piles in this study.
机译：由于堵土效应，开放式管桩的行为与封闭式管桩的行为不同。在这项研究中，进行了一系列的现场测试，以研究安装在粘土中的开放式预应力高强度混凝土（PHC）管桩的性能。将两个开放式PHC管桩与光纤布拉格光栅（FBG）传感器一起使用，并顶入粘土中以进行后续的静态载荷测试。在安装过程中连续测量测试桩的土塞长度，从而可以计算增量填充率。报告并分析了静载荷试验中的记录数据。还详细讨论了安装后的残余力分布及其对承载力的影响。在安装过程中，观察到测试桩处于部分堵塞的状态。测得的测试桩的极限竖井阻力和总阻力分别为639和1180 kN。安装后锁定在测试桩中的残余力会显着影响轴向力的评估，进而影响轴和端部阻力。如果在载荷测试中未考虑残余力，则往往会低估端部阻力，而高估轴阻力。然而，在这项研究中，残余力并未影响开放式PHC管桩的总承载能力。

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