层状地基中静钻根植竹节桩单桩沉降计算

doi:10.16285/j.rsm.2017.01.014

›› 2017, Vol. 38 ›› Issue (1): 109-116.doi: 10.16285/j.rsm.2017.01.014

层状地基中静钻根植竹节桩单桩沉降计算

周佳锦^{1, 2}，龚晓南^{1, 2}，王奎华^{1, 2}，张日红³，王孟波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. 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

收稿日期:2015-01-22 出版日期:2017-01-11 发布日期:2018-06-05
作者简介:周佳锦，男，1989年生，博士，主要从事桩基工程及地基处理等方面的研究工作。
基金资助:
国家自然科学基金(No. 51378464，No. 51578498，No. 51579217)

A simplified approach to calculating settlement of a single pre-bored grouting planted nodular pile in layered soils

ZHOU Jia-jin^{1, 2}, GONG Xiao-nan^{1, 2}, WANG Kui-hua^{1, 2}, ZHANG Ri-hong³, WANG Meng-bo³

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

Received:2015-01-22 Online:2017-01-11 Published:2018-06-05
Supported by:
This work was supported by the National Natural Science Foundation of China (51378464, 51578498, 51579217).

摘要/Abstract

摘要： 静钻根植竹节桩是一种由预制桩和水泥土组合而成的组合桩基，通过将预制桩和水泥土的复合弹性模量作为其桩身弹性模量，同时考虑桩身弹性模量沿桩身改变以及桩端水泥土扩大头的作用，采用理想弹塑性荷载传递函数提出了一种在均匀地基中静钻根植竹节桩单桩沉降计算方法。在此基础上，提出了静钻根植竹节桩在层状地基中荷载-位移曲线的递推计算方法。用所提出的计算方法对实际工程中的静钻根植竹节桩试桩的荷载-位移曲线进行计算，并与实测曲线进行比较，验证了所提计算方法的可靠性。选取土体基于预制桩的桩侧摩阻力值作为静钻根植竹节桩的侧摩阻力，计算所得极限承载力与实测极限承载力接近，说明静钻根植竹节桩桩-土接触面摩擦性质与预制桩桩-土接触面摩擦性质相似，且优于钻孔灌注桩桩-土界面摩擦性质。

关键词: 静钻根植竹节桩, 水泥土, 桩端扩大头, 理想弹塑性模型, 沉降计算

Abstract: The pre-bored grouting planted nodular pile is a type of composite pile foundations which consist of a precast pile and the cemented soil surrounding the pile. A simplified approach to calculating the settlement of a single pre-bored grouting planted nodular (PGPN) pile in homogeneous soil is proposed based on the ideal elastoplastic model; and the composite modulus of the PGPN pile is adopted in the calculation process. In addition, the varying modulus along the pile shaft and the function of the enlarged pile base are also considered in the calculation process. The settlement calculation approach of the PGPN pile in layered soils is then proposed based on the calculation approach in homogeneous soil. The proposed calculation approach is validated by comparing the calculated load-displacement curves of the test piles to the measured load-displacement curves. The skin friction of the PGPN pile is close to the skin friction of the precast pile foundation, demonstrating that the frictional capacity of the cemented soil-soil interface of PGPN pile is better than the frictional capacity of the pile-soil interface of the bored pile.

Key words: pre-bored grouting planted nodular pile, cemented soil, enlarged pile base, ideal elastoplastic model, settlement calculation

中图分类号:

TU 473

周佳锦，龚晓南，王奎华，张日红，王孟波，. 层状地基中静钻根植竹节桩单桩沉降计算[J]. , 2017, 38(1): 109-116.

ZHOU Jia-jin, GONG Xiao-nan, WANG Kui-hua, ZHANG Ri-hong, WANG Meng-bo，. A simplified approach to calculating settlement of a single pre-bored grouting planted nodular pile in layered soils[J]. , 2017, 38(1): 109-116.

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层状地基中静钻根植竹节桩单桩沉降计算

A simplified approach to calculating settlement of a single pre-bored grouting planted nodular pile in layered soils

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