陈仕洪 陈俊生

摘 要：双（多）排支护桩由于具有抗侧移刚度大、场地适用性强和方便施工等特点近年来在基坑工程上得到广泛应用。文章根据多排桩支护结构在挠曲微分方程的基础上得出的各点变形及内力方程，带竖向锚索多排桩支护结构预应力大小及施加竖向锚索的时间对支护结构的影响，考虑支护桩在桩身支护参数变化下对支护结构的内力位移的影响等研究结论，结合多个基坑支护工程项目的实践情况，总结了双（多）排桩的支护效果，验证了理论研究成果的可靠性，可为类似问题的理论研究和工程实践提供参考。

关键词：双（多） 排支护桩;挠曲分析;竖向锚索;支护参数;工程实践

中图分类号：TU47 文献标识码：A 文章编号：1001-5922（2021）05-0101-06

Research and Engineering Practice on Mechanical Properties of Double （Multiple） Row Pile Foundation Pit Support Structure

Chen Shihong1 ，Chen Junsheng1，2，3

（1 .School of Civil Engineering and Transportation， South China University of Technology， Guangzhou 510640， China; 2.State Key Laboratory of Subtropical Building Science， Guangzhou 510640， China; 3.South China Institute of Geotechnical Engineering， Guangzhou 510640， China）

Abstract：Double （multiple） row support pile has been widely used in foundation pit engineering in recent years due to its characteristics of large lateral displacement stiffness， strong site applicability and convenient construction. Based on the multiple row pile retaining structure in the deflection differential equation of deformation and internal force at every point on the basis of the equation， the influence of the prestress of the multi-row pile supporting structure with vertical anchor cables and the time of applying the vertical anchor cables on the supporting structure， and considering the influence of supporting pile on the internal force and displacement of supporting structure under the change of pile supporting parameters， etc， combined with the practice of multiple foundation pit supporting project， summarizes the double （multiple） pile supporting effect， test and verify the reliability of the theoretical research results， can be used as theoretical research and engineering practice of similar problems to provide the reference.

Key words：double （multiple） row support pile; deflection analysis; vertical anchor cable; support parameter; engineering practice

0 引言

隨着粤港澳大湾区建设的深入，临海软土地区基坑工程不断投入建设。临海区的基坑在设计和施工等方面的要求更加严格，如何在保证基坑的稳定性情况下将工程对环境的影响降到最小是施工的重难点。双排桩支护作为一种悬臂支护结构，具有较大的抗侧移刚度、场地适用性强和方便施工等优点，近年来在深度5～8m，基坑面积较大且无法做内支撑或锚索项目中得到了广泛的应用。为了深入了解双排桩的受力特性、变形特性及前后排桩的土压力分配等问题，学者们对进行了大量的研究。在双排桩支护参数方面，林鹏等[1-2]通过分析双排桩支护结构的特点以及结合实例分析得到了若干影响双排桩支护结构的参数及变化规律。……