| 静钻根植竹节桩承载力及荷载传递机制研究 |
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| 引用本文： | 周佳锦,王奎华,龚晓南,等.静钻根植竹节桩承载力及荷载传递机制研究[J].岩土力学,2014,35(5):1367-1376. |
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| 作者姓名： | 周佳锦 王奎华 龚晓南 等 |
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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，杭州 310058；2.浙东建材集团，浙江 宁波 315000 |
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| 基金项目： | 虚土桩法及其在桩基础动静特性分析中的应用研究（No. 50879077）。 |
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| 摘 要： | 静钻根植竹节桩是由预应力竹节桩和桩周水泥土构成的一种新型组合桩基,该新型桩不仅承载性能较好,而且可以大量减少桩基施工过程中所产生的泥浆污染。通过静钻根植竹节桩和钻孔灌注桩的静荷载对比试验及埋设在竹节桩桩身上的应变计对桩身轴力进行测量,分析了静钻根植竹节桩桩身的轴力分布情况以及侧摩阻力的分布,用有限元软件ABAQUS对静钻根植竹节桩进行三维建模计算,详细地分析这种新型组合桩的荷载传递机制。结合现场试验与模拟计算可以得到:在软土地区,静钻根植竹节桩这种新型组合桩的承载力比普通钻孔灌注桩要高;静钻根植竹节桩桩身变形由预制桩所控制,竹节桩与桩外围水泥土近似变形协调;竹节桩竹节的存在对组合桩承载性能有着极其重要的作用;在软土中静钻根植桩侧摩阻力是灌注桩侧摩阻力的1.051.10倍。
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| 关 键 词： | 静钻根植竹节桩 荷载传递机制 承载力 ABAQUS 三维建模 双层应力扩散 |
| 收稿时间： | 2013-06-25 |
Bearing capacity and load transfer mechanism of static drill rooted nodular piles |
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| ZHOU Jia-jin,WANG Kui-hua,GONG Xiao-nan,ZHANG Ri-hong,YAN Tian-long,XU Yuan-rong.Bearing capacity and load transfer mechanism of static drill rooted nodular piles[J].Rock and Soil Mechanics,2014,35(5):1367-1376. |
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| Authors: | ZHOU Jia-jin WANG Kui-hua GONG Xiao-nan ZHANG Ri-hong YAN Tian-long XU Yuan-rong |
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| Institution: | 1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 2. ZDOON Building Materials Group, 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. This kind of composite pile has a good bearing capacity, and the mud pollution will largely be reduced in its construction process. A group of experiments were conducted to provide a comparison between this composite pile and the bored pile. The axial force of the nodular pile was measured by the strain gauges attached on the pile shaft to analyze the distribution of the axial force and the skin friction along the shaft; and then a three-dimensional model was built by using the ABAQUS finite element program to investigate the load transfer mechanism of this composite pile in detail. The results of the field tests and ABAQUS simulation showed that: the bearing capacity of the static drill rooted nodular pile is better than that of the bored pile in soft soil area. The settlement of the composite pile is controlled by the precast pile, and the deformation of the precast pile and the cemented soil can be considered as deformation compatibility. The nodes on the nodular pile play an important role during the load transfer process; and the skin friction of the static drill rooted nodular pile is about 1.05-1.10 times of the skin friction of the bored pile in the same soil layer. |
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| Keywords: | static drill rooted nodular pile load transfer mechanism bearing capacity ABAQUS three-dimensional modeling double stress dispersion system |
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