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首先对桥梁桩基逆作法复合基础的基本概念进行了介绍,对逆作法复合基础的受力机理进行了梳理。通过对复合基础桩土荷载分担比、总沉降及工后沉降的单因子影响因素分析,给出了影响逆作法复合基础受力性能的几个关键因素。然后从地质条件、上部结构及基础型式、施工条件以及经济性要求等方面对扩大承台+桩、沉井+桩及沉箱+桩等逆作法复合基础型式的适用性进行了分析,并总结形成逆作法复合基础适用条件判别流程,可供基础设计人员参考和借鉴。
First of all, the basic conception of composite foundation of bridge pile foundation is introduced, and the force mechanism of composite foundation of inverted construction method is analyzed. Based on the analysis of single-factor influencing factors of load-sharing ratio, total settlement and post-construction settlement of composite foundation piles, several key factors that affect the mechanical properties of composite foundation are given. Then from the aspects of geological conditions, superstructure and basic types, construction conditions and economic requirements, the applicability of the counter foundation composite method of expanding caprock + pile, caisson + pile and caisson + pile is analyzed and summarized The basis for the application of the reverse method to determine the conditions of discrimination process, for reference and reference for the basic design staff.