泥质粉砂岩地层PHC管桩竖向承载特性试验研究  

Experimental Study of the Bearing Behavior of PHC Pipe Piles in Argillaceous Siltstone

作　　者：刘创 LIU Chuang(Hunan Provincial Transportation Planning,Survey&Design Institute Co.Ltd.,Changsha 410200)

机构地区：[1]湖南省交通规划勘察设计院有限公司,长沙410200

出　　处：《土工基础》2023年第3期512-514,523,共4页Soil Engineering and Foundation

摘　　要：根据长沙地区泥质粉砂地层中PHC管桩现场静载荷破坏性试验研究,PHC管桩桩端位于泥质粉砂岩地层时,Q~S曲线呈陡降型,存在明显破坏点,承载力类型呈端承摩擦桩型。根据单桩载荷试验结果结合地区经验反算桩侧和桩端阻力,提出了PHC管桩在软质岩石泥质粉砂岩桩侧、桩端阻力取值经验值,强风化泥质粉砂岩侧阻力和端阻力建议按《建筑桩基技术规范》建议值取低值。中风化泥质粉砂岩侧阻力建议按200~260kPa取值,端阻力建议按7000~9000kPa取值。This paper presents the PHC pipe pile static axial load tests in the argillaceous siltstone in Changsha area.When the tip of the PHC pipe pile in the argillaceous siltstone,the Q-S curve is steep,and has obvious failure points.The axial capacity type belongs to end-bearing and friction pile.According to the destructive test results of the single pile and the regional experience,the back-calculated pile side friction and tip resistance is performed.The empirical value of the PHC pipe pile in the soft argillaceous siltstone of the pile side friction and tip resistance is recommended.It is suggested that the side friction and the tip resistance of strongly weathered argillaceous siltstone should be lower according to the recommended value in“Technical Code for Piled Building Foundations”.The lateral resistance of the moderately weathered argillaceous siltstone is recommended to be 200-260kPa,and the end resistance is recommended to be 7000-9000kPa.

关 键 词：PHC管桩 现场载荷试验 桩侧阻力 桩端阻力 泥质粉砂岩 

分 类 号：TU457[建筑科学—岩土工程]