复合地基垫层的减振作用分析

Analysis on shock absorption effect of composite foundation cushion

从垫层桩基的减振机理出发,分析了垫层桩基和复合地基的等效性,提出了复合地基的减振机理和减振动力模型。复合地基的减振性能主要体现在减小振幅、粘滞阻尼耗能和摩擦耗能上。根据复合地基的减振机理,可把基础和垫层简化为多自由度的质、阻、弹振动体系,同时考虑滑动摩擦作用。最后,提出了按减振思想设计和施工复合地基的要求。

Composite foundation is as same as cushion-pile. Basd on shock absorption of cushion-pile, shock absorption mechanics and dynamic model of the composite foundation are put forward. The shock absorption capacity of the composite foundation manifests in amplitude reduction, viscous damping energy dissipation and friction energy dissipation. Based on the shock absorption mechanics of the composite foundation, the foundation and cushion can be simplified as a degree of multi-freedom vibrating system with mass, damping and elasticity. In the meantime, the frictional action must be considered. Finally, the design and construction demands of the composite foundation are posed.