软土地区填砂竹节桩抗压承载性能研究

doi:10.16285/j.rsm.2016.2831

›› 2018, Vol. 39 ›› Issue (9): 3425-3432.doi: 10.16285/j.rsm.2016.2831

软土地区填砂竹节桩抗压承载性能研究

周佳锦¹，龚晓南¹，严天龙³，张日红^{2, 3}

1. 浙江大学滨海和城市岩土工程研究中心，浙江杭州 310058； 2. 宁波大学建筑工程与环境学院，浙江宁波 315211； 3. 中淳高科桩业股份有限公司，浙江宁波 315000

收稿日期:2016-12-02 出版日期:2018-09-11 发布日期:2018-10-08
通讯作者: 龚晓南，男，1944年生，博士，院士，教授，博士生导师，主要从事基础工程、基坑工程和地基处理等方面的研究工作。E-mail：gongxn@zju.edu.cn E-mail: zhoujiajin@zju.edu.cn
作者简介:周佳锦，男，1989年生，博士，主要从事桩基工程，地基处理等方面的研究工作
基金资助:
国家自然科学基金项目（No.51578498,51579217）；中国博士后科学基金（No.2017M611995）

Behavior of sand filled nodular piles under compression in soft soil areas

ZHOU Jia-jin¹, GONG Xiao-nan¹, YAN Tian-long³, ZHANG Ri-hong^{2, 3}

1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China; 2. Faculty of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo, Zhejiang 315211, China; 3. ZCONE High-tech Pile Industry Holdings Co., Ltd., Ningbo, Zhejiang 315000, China

Received:2016-12-02 Online:2018-09-11 Published:2018-10-08
Supported by:
This work was supported by the National Natural Science Foundation of China (51578498, 51579217) and the China Postdoctoral Science Foundation (2017M611995)

摘要/Abstract

摘要： 软土地区土体工程性质较差，土体所能提供桩侧摩阻力和桩端阻力较小，预制桩桩身材料强度无法充分发挥。在预制桩压入土体过程中灌入砂石能够改善桩周土体性质，提高桩-土接触面摩擦性能，从而提高桩基的抗压极限承载力。为了研究填砂竹节桩的抗压承载性能，进行了一组现场静载试验和ABAQUS三维建模计算，通过对试验和计算结果的分析可以得出以下结论：软土地基中填砂竹节桩的抗压承载性能相比常规等截面管桩有了显著提高；填砂竹节桩桩身轴力在竹节节点处减少幅度较大，竹节节点能够提高桩侧承载性能；软土地基中填砂竹节桩桩侧承载性能相比常规等截面管桩有了显著提高，且侧阻增大系数为1.15～1.40。

关键词: 竹节桩, 填砂, 承载性能, ABAQUS, 三维建模

Abstract: The geological properties of the soil are poor in soft soil areas, and the ultimate skin friction and tip resistance provided by the foundation soil are also limited in these areas. The material strength of the precast pile shaft can’t be fully mobilized in soft soil areas. Filling sand into the foundation soil in precast pile construction process can improve the properties of the foundation soil and promote the frictional capacity of the pile-soil interface as well. The compressive bearing capacity of pile foundation can then also be enhanced. A group of field tests as well as ABAQUS simulation are used to investigate the bearing capacity of the sand filled nodular pile. The following conclusions can be gained based on the measured and simulation results: the compressive bearing capacity of the sand filled nodular pile is obviously better than the compressive bearing capacity of the conventional pipe pile in soft soil areas; the axial force of the sand filled nodular pile decreases sharply at the nodes along the nodular pile, and the nodes along the nodular pile can promote the shaft bearing capacity of the pile foundation; the shaft bearing capacity of the sand filled nodular pile is much better than that of the conventional pipe pile in soft soil areas, and the enlarged shaft resistance coefficient is about 1.15-1.40.

Key words: nodular pile, sand filled, bearing capacity, ABAQUS, three-dimensional modeling

中图分类号:

TU 473

周佳锦，龚晓南，严天龙，张日红, . 软土地区填砂竹节桩抗压承载性能研究[J]. , 2018, 39(9): 3425-3432.

ZHOU Jia-jin, GONG Xiao-nan, YAN Tian-long, ZHANG Ri-hong, . Behavior of sand filled nodular piles under compression in soft soil areas[J]. , 2018, 39(9): 3425-3432.

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软土地区填砂竹节桩抗压承载性能研究

Behavior of sand filled nodular piles under compression in soft soil areas

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