高强预应力混凝土短桩的竖向抗压承载力  

Vertical compressive capacity of pre-stressed high-strength concrete short pile

作　　者：徐刚 XU Gang(Guangzhou Research Institute of Construction Industry Co.,Ltd.,Guangzhou 510663,China;Guangzhou Construction Industry Development Co.,Ltd.,Guangzhou 510663,China)

机构地区：[1]广州建筑产业研究院有限公司,广州510663 [2]广州建筑产业开发有限公司,广州510663

出　　处：《南昌大学学报（工科版）》2024年第4期451-457,共7页Journal of Nanchang University(Engineering & Technology)

基　　金：广州市建筑集团有限公司科技计划项目(2020-KJ017、2022-KJ014)。

摘　　要：由于地质条件的影响,高强预应力混凝土(PHC)管桩会出现有效桩长较短(如6~8 m)、桩长差异较大等不利情况,PHC短桩竖向承载力的合理取值关乎地基基础的安全性、经济性及施工进度。为深入研究PHC短桩的受力机理及其竖向承载力的影响因素,以解决广州番禺某高层项目中的PHC短桩(6 m左右)竖向承载力问题为出发点,通过对工程桩的静载试验Q-s曲线和附近钻孔资料的对比分析,结合地勘报告的验算结果,合理提高了核心筒区域PHC短桩的竖向承载力,避免了补桩,经济效应显著。PHC短桩的竖向承载力,与桩侧及桩端土岩层的工程地质特性、成桩工艺等密切相关,应结合桩侧及桩端土岩层特性、有代表性试桩的静载试验结果、相关技术标准、地区经验及沉降控制要求等合理确定,并采取必要的措施以确保地基基础的安全性、合理性及经济性。Due to the influence of geological conditions,there are often adverse situations in the application of pre-stressed high-strength concrete(PHC)pipe pile,such as short effective pile length(e.g.,6-8 m)and large differences in pile length.The reasonable value of the vertical compressive capacity of PHC short pile is related to the safety,economy,and construction progress of the foundation.To study the mechanical mechanism of a PHC short pile and the principle and method of determining its vertical compressive capacity,this paper took the solution of the vertical compressive capacity of a PHC short pile(about 6 m)in a high-rise project in Panyu,Guangzhou,as the starting point.Through the comparative analysis of Q-s curve of the static load test of engineering pile and nearby drilling data,combined with the checking results of geological prospecting report,the vertical compressive capacity of PHC short pile in the core tube area was reasonably improved,pile filling was avoided and the economic effect was remarkable.The vertical compressive capacity of PHC short pile was related to the engineering geological characteristics and pile formation technology of the soil rock stratum at pile side and pile end.It should be reasonably determined according to the soil rock stratum characteristics of pile side and pile end,static load test results of representative piles,relevant technical standards,regional experience and settlement control requirements,and the necessary measures should be taken to ensure the safety,rationality and economy of the foundation.

关 键 词：高强预应力混凝土管桩 短桩 有效桩长 竖向抗压承载力 

分 类 号：TU375[建筑科学—结构工程]