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对沉箱基础底部加桩之后侧向动力性能的改善问题进行了研究。首先,通过沉箱和群桩两部分在界面处的内力平衡和位移协调条件建立了复合基础的水平–摇摆振动方程,其中沉箱部分的振动方程采用动力Winkler地基模型根据受力平衡条件建立,群桩部分的振动特性则依据既有文献的研究成果。然后,对沉箱振动的动力Winkler地基模型参数进行了研究,得到改进的表达式。最后,通过算例研究了层状地基中复合基础的水平–摇摆振动问题,验证了沉箱下群桩明显地改善了基础的动力性能。
The problem of improving the lateral dynamic performance after adding pile at the bottom of caisson foundation was studied. First of all, the horizontal-oscillatory vibration equations of the composite foundation are established by the internal force balance and displacement coordination between the two parts of caisson and pile groups at the interface. The vibration equation of the caisson part is established by dynamic Winkler foundation model according to the force balance condition, Part of the vibration characteristics are based on the research results of existing literature. Then, the dynamic Winkler foundation model parameters of caisson vibrations are studied, and the improved expression is obtained. Finally, the horizontal-oscillatory vibration problem of composite foundations in layered soils is studied by numerical examples. It is verified that the sub-pile group significantly improves the foundation dynamic performance.