采用有限元法模拟分析了在较大坑外堆载条件下，桩锚支护箱涵深基坑的受力规律，并通过对比四种桩锚方案的支护结构受力状况和过程，探讨了不同应力特点对支护结构的影响。结果表明，堆载对基坑上层土体产生了很大的侧向压力，因此把首层锚索尽可能地设置在护坡桩顶，并予以加强，可以有效地控制桩的位移和内力，而增设双排桩对改善支护结构内力的效果不显著，不建议采用。另外，锚桩受到地层的约束较弱，在水平拉力下几乎呈平动，未能有效起到锚的作用，因此也不建议采用。

In this paper, the structural force status of a pile-anchor retained deep box culvert pit with a large external surface load was simulated using the finite element method. Four retaining schemes were studied, and the force and loading process of the supporting structure under each scheme were compared to investigate the impacts of different stress characteristics on the supporting structure. The results showed that the surface load can cause a large lateral stress on the upper pit, and therefore the first-level cable should be strengthened and set on the pile top, which can effectively limit the displacement and inner force of the pile. The double-row pile did not improve the inner force of the pile, thus it was suggested not to be applied. Moreover, the anchor pile was also not suggested due to that it is weakly constrained and translational displacement occurs with the horizontal pull from the cable force.

北京工业职业技术学院2013年院级科研课题“深基坑支护施工全过程仿真系统的开发”，编号：bgzyky201362 水利部公益性行业科研专项“水利水电专业软件平台开发”，编号：201201050