深圳大学学报（理工版）2025，Vol.42Issue(4)：380-387,8.DOI:10.3724/SP.J.1249.2025.04380
预应力抗拔能源桩的结构-温度耦合性能
Coupled structural-thermal analysis of a prestressed uplift-resistant energy pile
摘要
Abstract
To achieve the deep integrated function of uplift resistance and shallow geothermal energy utilization in pile foundations,this study aims to investigate the coupled structural-thermal performance of prestressed uplift energy piles.The DIANA finite element software is employed to simulate the uplift loading and temperature variation processes.A total strain crack model is adopted for pile concrete to simulate the entire failure process of cracking.Embedded reinforcement is utilized for pile reinforcement and the unbonded prestress is introduced by post-tensioning.The proposed model is validated through comparison with existing field test data.Subsequently,the effects of prestress level,pile constitutive model,and coupled thermal-structural loading on the response of uplift piles are analyzed.Results show that prestressing effectively suppresses crack development and exerts the skin friction in the mid-to-lower pile sections,thereby significantly enhancing uplift capacity.Under coupled thermal-structural loading,tensile thermal stresses induced by shrinkage under cold conditions combine with tensile stresses caused by uplift forces.Significant thermal tensile stresses occur in the mid-to-lower pile sections,no cracking occurs after superposition with tensile stresses from uplift.In addition,the peak displacement of prestressed pile under cooling conditions decreases by approximately 10%compared to conventional pile.This study provides theoretical support for future research and engineering applications involving uplift-resistant energy piles.关键词
能源桩/浅层地热能/预应力/抗拔承载力/总应变裂缝模型Key words
energy pile/shallow geothermal energy/prestress/uplift capacity/total strain crack model分类
建筑与水利引用本文复制引用
王星凯,程晓辉..预应力抗拔能源桩的结构-温度耦合性能[J].深圳大学学报（理工版）,2025,42(4):380-387,8.基金项目
National Natural Science Foundation of China(51778338,52078274) （51778338,52078274）
Science and Technology Major Project of Ningbo Municipality(2022Z224) 国家自然科学基金资助项目(51778338,52078274) （2022Z224）
宁波市重大科技任务攻关资助项目(2022Z224) （2022Z224）
