中外公路2025，Vol.45Issue(3)：18-24,7.DOI:10.14048/j.issn.1671-2579.2025.03.003
引扩孔灌浆后植入预制混凝土桩工程性能试验研究
Experimental Study on Engineering Performance of Post-Planted Precast Concrete Pile with Prebored Grouting
摘要
Abstract
The traditional piling methods of precast concrete(PC)piles are difficult to pass through the hard soil layers and tend to induce severe soil squeezing effects.To address this issue,the technology of a post-planted PC pile with prebored grouting was analyzed.Based on the project of the Hefei‒Zongyang section of G3W Dezhou‒Shangrao Expressway,the bearing characteristics of post-planted PC piles were researched by the load tests of five piles in two different field test sections.The results show that the bearing capacity of the PC piles can be effectively improved by setting the cement mortar coating layer around the PC piles.The settlement of the pile top under the engineering design load is only about 1.96‒3.28 mm.By considering the structural characteristics of the composite pile body,the resistance of the interface between the inner PC pile and the outer cement mortar changes from large at both ends to small in the middle,and the resistance of the interface between the cement mortar and the surrounding soil increases with the depth,which indicates that the cement mortar coating layer can effectively transfer the load of the inner PC pile,enlarge the diameter of the post-planted PC pile,and reinforce the pile body.关键词
后植入桩/引扩孔/复合桩/承载特性/载荷试验Key words
post-planted pile/prebored/composite pile/bearing characteristic/load test分类
交通工程引用本文复制引用
赵宇,王伟,江磊,宋振亚,张浩..引扩孔灌浆后植入预制混凝土桩工程性能试验研究[J].中外公路,2025,45(3):18-24,7.基金项目
国家自然科学基金青年基金资助项目(编号:51608490) （编号:51608490）
高速铁路建造技术国家工程研究中心开放基金资助项目(编号:HSR202102) （编号:HSR202102）
河南省重点研发与推广专项(科技攻关)(编号:192102310482) （科技攻关）
