CFG桩处理软土路基的设计及载荷试验研究  

Design and Load Test Study of CFG Pile for Soft Soil Roadbed Treatment

作　　者：黎家龙 LI Jiaong(Foshan Zhongche Highway Investment Co.,Ltd.Foshan 528000,China)

机构地区：[1]佛山市中策高速公路投资有限公司,广东佛山528000

出　　处：《广东土木与建筑》2025年第3期112-114,共3页Guangdong Architecture Civil Engineering

摘　　要：CFG桩被广泛用于软土路基的处理,其处理效果受到桩长、桩间距等诸多因素的影响,且CFG桩载荷试验是验证处理效果的重要手段之一。本文依托某一工程实例,设计了CFG桩的加固处理方案,总结了CFG桩的施工技术要点及检测重点,分析了CFG单桩及其复合地基的荷载试验。结果表明:①本工程的设计方案CFG桩桩径0.5m,间距2.0m,正方形布置,平均桩长17.0m,桩身混凝土强度为C20,处理软土地基效果较好,满足设计要求。②在CFG桩单桩及复合地基荷载试验中,单桩桩顶和复合地基的变形量随着荷载增大而增加。单桩最大累计变形量为8.18mm,平均累计最大变形量为6.77mm。复合地基最大变形量为8.80mm,平均累计最大变形量为7.49mm。单桩加载试验Q-s曲线和复合地基加载试验P-s曲线未出现明显拐点,说明外荷载未达到其极限载荷。研究结果为CFG桩处理软土地基的设计提供了一定的参考。CFG piles are widely used in the treatment of soft soil roadbed,and their treatment effect is influenced by many factors such as pile length and pile spacing.CFG pile load test is one of the important means to verify the treatment effect.Based on a certain engineering example,designs a reinforcement treatment plan for CFG piles,summarizes the construction technology and testing key points of CFG piles,and analyzes the load tests of CFG single piles and their composite foundations.The results show that:①The design scheme of this project involves CFG piles with a diameter of 0.5 m,a spacing of 2.0 m,a square arrangement,an average pile length of 17.0 m,and a concrete strength of C20 for the pile body.The effect of treating soft soil foundation is good,meeting the design requirements.②In the load test of CFG pile and composite foundation,the deformation of the top of the single pile and composite foundation increases with the increase of load.The maximum cumulative deformation of the single pile is 8.18 mm,the average cumulative maximum deformation is 6.77 mm.The maximum deformation of the composite foundation is 8.80 mm,and the average cumulative maximum deformation is 7.49 mm.The Q-s curve of the single pile loading test and the P-s curve of the composite foundation loading test did not show a significant turning point,indicating that the external load did not reach its ultimate load.The research results provide a certain reference for the design of CFG pile treatment of soft soil foundation.

关 键 词：CFG桩 软土路基 桩长 桩间距 荷载试验 

分 类 号：U416.1[交通运输工程—道路与铁道工程]