\r周佳锦¹，张日红^{2, 3}，黄 晟¹，龚晓南¹，严天龙³，许国林\r³\r
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AuthorsHTML:\r周佳锦¹，张日红^{2, 3}，黄 晟¹，龚晓南¹，严天龙³，许国林\r³\r
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AuthorsListE:\rZhou Jiajin¹，Zhang Rihong^{2, 3}，Huang Sheng¹，Gong Xiaonan¹，Yan Tianlong³，Xu Guolin\r³\r
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AuthorsHTMLE:\rZhou Jiajin¹，Zhang Rihong^{2, 3}，Huang Sheng¹，Gong Xiaonan¹，Yan Tianlong³，Xu Guolin\r³\r
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Unit:\r\r1. 浙江大学滨海和城市岩土工程研究中心，杭州 310058；\r
\r\r2. 宁波大学建筑工程与环境学院，宁波 315211；
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\r3. 中淳高科桩业股份有限公司，宁波 315000\r
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Unit_EngLish:\r1. Research Center of Coastal and Urban Geotechnical Engineering，Zhejiang University，Hangzhou 310058，China；
2. Faculty of Architectural，Civil Engineering and Environment，Ningbo University，Ningbo 315211，China；
3. ZCONE High-Tech Pile Industry Holdings Co.，Ltd.，Ningbo 315000，China\r
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Abstract_Chinese:\r软土地区土体工程性质较差，土体所能提供的桩侧阻力较小，限制了PHC 管桩承载性能的发挥．预应力高强混凝土竹节桩(PHDC 桩)桩身每隔一定距离存在一个突出的竹节节点，竹节节点能够增加桩基的桩侧承载性能，从而提高桩基的极限承载力．为了研究PHDC 桩在软土地基中的承载性能，进行了一系列PHDC 桩和PHC 管桩的现场静载试验，通过对试验结果的分析，得出以下结论：PHDC 桩施工过程对桩周土体的扰动程度较大；当休止期为15 d 时，PHDC 桩周围的土体强度未恢复，PHDC 桩的极限承载力远低于设计值；当休止期增加到40 d 时，350(400)mm PHDC 桩的极限承载力与400 mm 直径的PHC 管桩的极限承载力相同，说明当PHDC 桩的桩周土体强度恢复时，PHDC 桩的承载性能优于PHC 管桩的承载性能；休止期为40 d 时，3 号和4 号PHDC 桩达到极限承载力时的桩顶位移值分别为桩身直径的9.46%和7.37%，大于PHC管桩达到极限承载力时所需要的桩顶沉降值．\r
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Abstract_English:\rThe geological property of the soil in soft soil areas is poor，and the ultimate skin friction provided by the foundation soil is small，which hampers the behavior of PHC pipe pile．The pre-stressed high-strength concrete nodular pile(PHDC pile)consists of a nodule every certain distance along the shaft，and the nodules along the shaft
can promote the frictional capacity．A series of field tests were conducted to investigate the bearing capacity of PHDC pile in soft soil areas，and the following conclusions can be gained based on the field test results：the PHDC pile installation process induces more disturbances to the surrounding soil，and the ultimate bearing capacity of PHDC pile is much smaller than that of the PHC pile after being allowed to cure for 15 d，which indicates that the strength of the soil around the pile is relatively small；the ultimate bearing capacity of 350(400) mm PHDC pile is identical to that of the 400 mm PHC pipe pile after being cured for 40 d，which indicates that the bearing capacity of PHDC pile is better than the bearing capacity of PHC pipe pile；the pile head displacements needed to fully mobilize the ultimate bearing capacity are 9.46% and 7.37% pile diameter respectively of the two PHDC piles，which are larger than that of the PHC pipe pile．\r
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Keyword_Chinese:软土地区；预应力高强混凝土竹节桩；PHC管桩；现场静载试验；承载性能\r

Keywords_English:soft soil area；pre-stressed high-strength concrete nodular pile；PHC pipe pile；field test；bearing capacity\r


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