新型螺旋成孔根植注浆竹节管桩抗压性状数值模拟研究

›› 2013, Vol. 34 ›› Issue (7): 2119-2126.

新型螺旋成孔根植注浆竹节管桩抗压性状数值模拟研究

杨淼¹，张忠苗¹，刘念武¹，施茂飞¹，张日红²

1. 浙江大学岩土工程研究所，杭州 310058；2. 浙东建材集团，浙江宁波 315101

收稿日期:2012-07-13 出版日期:2013-07-10 发布日期:2013-07-15
作者简介:杨淼，女，1986年生，硕士研究生，主要从事基础工程、桩基础及其检测方面的研究

Numerical simulation of compressive mechanical characters of new bored grouting PHC nodular pile

YANG Miao¹，ZHANG Zhong-miao¹，LIU Nian-wu¹，SHI Mao-fei¹，ZHANG Ri-hong²

1. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 2. ZDOON Group, Ningbo, Zhejiang 315101, China

Received:2012-07-13 Online:2013-07-10 Published:2013-07-15

摘要/Abstract

摘要： 新型螺旋成孔根植注浆竹节管桩是一种新的组合桩型，具有承载力高、技术含量高和安全性能好等特点。为了更好地了解新型组合桩的抗压承载机制，应用ABAQUS软件进行抗压数值模拟。通过将模拟结果与现场试验结果对比，验证了数值模型的可靠性。分析模拟结果，发现桩身竹节处存在2～3倍桩径的应力影响范围，并且存在1.6～1.8倍桩径的空壳区，竹节极限承载力从上到下排列线性增长（除第1节和最后一节）。结果还表明，竹节间距、水泥土厚度、桩侧土弹性模量以及桩端土弹性模量都对组合桩极限承载力有影响，而水泥土弹性模量的影响则可忽略。以往相似工法的极限承载力公式都不能很好地诠释本桩型的受力特性，因此，结合理论分析与抗压受力机制，提出考虑侧阻竹节影响系数的单桩极限承载力公式，与现场试验结果对比，较为接近。

关键词: 新型螺旋成孔根植注浆竹节管桩, ABAQUS模拟, 简化模型, 极限承载力, 竹节影响系数, 竹节间距

Abstract: New bored grouting PHC nodular pile is a new kind of composite pile. And it has a lot of advantages, such as higher bearing capacity, more technologies, and higher security. For the sake of getting to know the compressive mechanical characters of new bored grouting PHC nodular pile, ABAQUS is used to simulate the vertical compressive load test. Comparing the simulated result with the field test result, the reliability of ABAQUS numerical model is acceptable. And it is found that: the radius of nodular stress influence is 2-3 times pile diameter; there is no friction at about 1.6-1.8 times pile diameter distance around of the nodule; ultimate bearing capacity of the nodules increases linearly from top to bottom except the first and the last ones. It is also shown that nodular space, sickness of soil-cement and the elastic moduli of soils of pile side and pile tip influence ultimate bearing capacity of the composite pile; and the elastic modulus of soil-cement can be ignored. Existing formulas of ultimate bearing capacity can’t work for mechanical characters of the new composite pile well. So, by combining theoretical analysis and compressive mechanism, a new formula of ultimate bearing capacity considering nodular influence coefficient is proposed; and its validity is verified by field tests.

Key words: new bored grouting PHC nodular pile, ABAQUS simulation, simplified model, ultimate bearing capacity, nodular influence coefficient, nodular space

中图分类号:

TU 473

杨淼，张忠苗，刘念武，施茂飞，张日红 . 新型螺旋成孔根植注浆竹节管桩抗压性状数值模拟研究[J]. , 2013, 34(7): 2119-2126.

YANG Miao ，ZHANG Zhong-miao ，LIU Nian-wu ，SHI Mao-fei ，ZHANG Ri-hong . Numerical simulation of compressive mechanical characters of new bored grouting PHC nodular pile[J]. , 2013, 34(7): 2119-2126.

参考文献

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