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浙江大学学报(工学版)
浙江大学学报(工学版)
土木工程     
静钻根植抗拔桩承载性能数值模拟
周佳锦1,2,王奎华1,2,龚晓南1,2 ,张日红3,严天龙3
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
Numerical simulation on  behavior of static drill rooted pile under tension
ZHOU Jia jin1,2, WANG Kui hua1,2, GONG Xiao nan1,2, ZHANG Ri hong3,YAN Tian long3
1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China,2. Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education, Zhejiang University, Hangzhou 310058, China; 3. ZCONE High tech Pile Industry Holdings Company Limited, Ningbo 315000, China
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摘要：

为了对静钻根植抗拔桩的承载性能进行研究,进行一组现场静载试验和有限元软件ABAQUS模拟计算.通过将模拟计算与现场实测荷载位移曲线进行对比验证所建立模型的可靠性.模拟结果表明：由于桩端水泥土扩大头的存在,静钻根植抗拔桩的荷载位移曲线比较平缓,桩端扩大头直径越大,桩基荷载位移曲线越平缓；桩周水泥土与桩端水泥土弹性模量的改变对静钻根植抗拔桩承载力的影响不大；在软土地区中桩侧摩阻力较小,静钻根植抗拔桩的抗拔承载力主要由桩端水泥土扩大头提供,增加桩身钻孔直径不利于静钻根植抗拔桩承载性能的发挥；桩端扩大头高度对静钻根植抗拔桩承载力影响不大,而静钻根植抗拔桩承载力随着扩大头直径的增加而增大.在实际工程中在保证桩端水泥土强度的前提下可以将桩端水泥土扩大头直径增加到2倍桩身钻孔直径.
Abstract:

A group of field tests and finite element software ABAQUS were used to investigate the uplift bearing capacity of the static drill rooted nodular pile. The numerical simulation result was verified to be reliable by being compared to the measured results. The simulation results show that the load displacement curve of the static drill rooted nodular pile under tension appears to be stable because of the existence of the enlarged pile base, moreover, the curve becomes more flat with the diameter of the enlarged pile base increasing. The modulus of the cemented soil along the shaft and the cemented soil at the enlarged base both have little influence on the uplift bearing capacity of the static drill rooted nodular pile. The uplift bearing capacity of the static drill rooted nodular pile is supported mainly by the enlarged pile base in soft soil areas where the amount of the skin friction is small, and to increase the diameter of the drilling hole along the shaft  will decrease the bearing capacity of the enlarged pile base. The height of the enlarged cemented soil base has little influence on the uplift bearing capacity of the static drill rooted nodular pile, while the uplift bearing capacity of the static drill rooted nodular pile will  increase with the diameter of the enlarged pile base increasing. As a result, the diameter of the enlarged base can be amplified to 2 times of the diameter of the drilling hole along the shaft on condition that the strength of the cemented soil is guaranteed.
出版日期: 2015-11-01
:  TU 47  
基金资助:

国家自然科学基金资助项目（51278450，51378464，51578498）
通讯作者: 王奎华，男，教授，博导.ORCID:0000 0002 9362 0326.     E-mail: zdwkh0618@zju.edu.cn
作者简介: 周佳锦(1989-)，男，博士生，从事桩基工程及地基处理等方面的研究工作.ORCID:0000 0003 4267 1454. E-mail: zjjmuforever@163.com
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引用本文:

周佳锦,王奎华,龚晓南,张日红,严天龙. 静钻根植抗拔桩承载性能数值模拟[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008 973X.2015.11.014.

ZHOU Jia jin, WANG Kui hua, GONG Xiao nan, ZHANG Ri hong,YAN Tian long. Numerical simulation on  behavior of static drill rooted pile under tension. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008 973X.2015.11.014.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008 973X.2015.11.014    或    http://www.zjujournals.com/eng/CN/Y2015/V49/I11/2135

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