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城市下穿铁路箱形桥常采用顶入法施工,顶进过程中,千斤顶所产生的顶力经常使工作坑围护结构产生附加内力变形。但后背梁与滑板整体浇筑的特点,使得通过后背梁作用在围护结构上的顶力不明确,这种附加内力变形有多大,设计中如何考虑,目前没有清楚的认识,开展相关的研究具有重要的工程意义。采用弹性地基梁法对围护结构进行基坑开挖与箱涵顶进全过程内力变形分析,通过对施工过程中基坑围护桩和后背梁的水平位移进行监测,取得了作用在围护结构上的顶力分担比及箱涵顶进对工作坑围护结构内力变形的影响,为完善箱涵顶进工作坑的设计方法提供参考。
The city under the railway box girder often used top-in construction method, the jacking process, the top jacks produced by the force often make the work of the retaining structure of retaining the additional internal force deformation. However, the characteristics of the integral structure of the back beam and the skateboard make the top force exerted by the back beam on the envelope not clear, how much the additional internal force is deformed, how to consider the design, and there is no clear understanding to carry out the related Research has important engineering significance. The elastic foundation beam method is used to analyze the internal force deformation of the foundation pit excavation and box culvert jacking in the whole process. By monitoring the horizontal displacement of the foundation pit retaining piles and the back beam in the construction process, The contribution ratio of jacking force and the influence of box culvert jacking on the internal force deformation of the retaining wall of retaining pit are provided for reference to improve the design method of box culvert jacking working pit.