• 学报（中文） •

### 静钻根植竹节桩抗压与抗拔对比研究

1. 1. 浙江大学 滨海和城市岩土工程研究中心; 软弱土与环境土工教育部重点实验室， 杭州 310058； 2. 中淳高科桩业股份有限公司， 浙江 宁波 315000
• 作者简介:龚晓南（1944-），男，浙江省金华市人，教授，博士生导师，主要从事岩土工程方面教学和研究工作.E-mail：xngong@hzcnc.com.
• 基金资助:
国家自然科学基金资助项目（51278450，51578498）

### A Comparative Study on the Static Drill Rooted Nodular Piles Under Tension and Compression

GONG Xiaonan，XIE Cai，ZHOU Jiajin，SHAO Jiahan，SHU Jiaming

1. 1. Research Center of Coastal and Urban Geotechnical Engineering, Ministry of Education Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China; 2. ZCONE High-tech Pile Industry Holdings Company Limited, Ningbo 315000, Zhejiang, China

Abstract: The pre-bored grouting planted nodular (PGPN) pile is a new type of composite pile foundation. A large number of field test results have shown that the ultimate skin friction of piles under tension and compression has big differences. The total lateral friction reduction factor is defined as the ratio of shaft resistance between uplift pile and compressive pile. To investigate the differences of skin friction distribution of the PGPN piles under tension and compression in soft soils, a group of field tests were carried to obtain the load-displacement curves of piles under tension and compression, and then Abaqus was used to simulate test piles. The comparison between results of field tests and Abaqus simulation was used to validate finite element model. The results showed that the axial forces of piles under tension and compression have similar transfer characteristics; the uplift coefficient of the PGPN piles in soft soils is 0.5. The increase of diameter of enlarged pile tip has little effect on ultimate skin friction of piles under tension and compression. The total lateral friction reduction factor of the PGPN piles is a constant with the increase of the diameter of enlarged pile base.