| 静钻根植竹节桩桩端承载性能试验研究 |
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| 引用本文： | 周佳锦,王奎华,龚晓南,张日红,严天龙.静钻根植竹节桩桩端承载性能试验研究[J].岩土力学,2016,37(9):2603-2609. |
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| 作者姓名： | 周佳锦 王奎华 龚晓南 张日红 严天龙 |
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| 作者单位： | 1. 浙江大学 滨海与城市岩土工程研究中心，浙江 杭州 310058；2. 浙江大学 软弱土与环境土工教育部重点实验室，浙江 杭州 310058； 3. 中淳高科桩业股份有限公司，浙江 宁波 315000 |
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| 基金项目： | 国家自然科学基金（No.51578498，No.51579217）。 |
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| 摘 要： | 静钻根植竹节桩是由预制竹节桩和桩周水泥土所构成的一种新型组合桩基，它主要通过桩周水泥土改善桩-土接触面摩擦性质以及桩端水泥土扩大头改善桩端承载性能。通过现场静载试验对静钻根植竹节桩桩端承载性能进行研究，并采用传统桩端沉降计算公式对其桩端沉降进行计算；通过模型试验对竹节桩桩端与水泥土扩大头相对位置不同的试桩桩端承载性能进行研究。结合现场和模型试验可以得到：桩端水泥土扩大头可以改善静钻根植竹节桩桩端承载性能；当竹节桩桩端位于水泥土扩大头中间位置时，静钻根植竹节桩桩端承载性能最好；可以用传统桩端沉降计算公式对静钻根植竹节桩桩端沉降进行计算，且当竹节桩桩端位于水泥土扩大头中间位置时，理论计算与实测曲线几乎完全吻合。
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| 关 键 词： | 静钻根植工法 竹节桩 自平衡法 桩端水泥土扩大头 桩端承载性能 |
| 收稿时间： | 2014-10-17 |
A test on base bearing capacity of static drill rooted nodular pile |
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| ZHOU Jia-jin,WANG Kui-hua,GONG Xiao-nan,ZHANG Ri-hong,YAN Tian-long.A test on base bearing capacity of static drill rooted nodular pile[J].Rock and Soil Mechanics,2016,37(9):2603-2609. |
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| Authors: | ZHOU Jia-jin WANG Kui-hua GONG Xiao-nan ZHANG Ri-hong YAN Tian-long |
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| Institution: | 1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China; 2. Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education, Zhejiang University, Hangzhou, Zhejiang 310058, China; 3. ZCONE High-Tech Pile Industry Holdings Co., Ltd., Ningbo, Zhejiang 315000, China |
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| Abstract: | The static drill rooted nodular pile is a new type of composite pile foundation which consists of precast nodular pile and the cemented soil along the pile shaft. The bearing capacity of this composite pile is promoted via the cemented soil around the pile shaft which improves the skin friction and the enlarged cemented soil base which promotes the tip bearing capacity. A field test by self-balanced method is conducted to investigate the tip bearing capacity of this new type of pile; the theoretical tip displacement formula is also adopted to calculate the tip displacement of the composite pile. In addition, a model test is conducted to study the tip bearing capacity of the new type pile with different relative positions of the precast nodular pile base and enlarged cemented soil base. The results of the field test and model test show that: the enlarged cemented soil base can truly promote the tip bearing capacity of the new type pile; the tip bearing capacity of this new type of pile seems to be fully mobilized when the nodular pile tip is at the middle of the enlarged cemented soil base; the theoretical tip displacement formula can be applied to this new composite pile foundation; and the theoretical tip displacement-tip load curve fits well with the measured curve when the nodular pile tip is at the middle of the enlarged cemented soil base. |
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| Keywords: | static drill rooted method nodular pile self-balanced method enlarged cemented soil base base bearing capacity |
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