瑞利波作用下双层地基中群桩横向动力响应

采用文克勒地基染模型建立了桩－土－桩相互作用的粘弹性模型，在现有的成层地基中瑞皮弥散曲线解析解的基础,瑞利波作用下的双桩横向相互作用因子^↑α的计算公式。利用Poulos的“叠加原理”，在双桩的基础上得出了群桩桩顶横向位移及桩顶剪力计算公式，经过一系列的参数分析，得出了瑞利波引起的“群桩效应”对于桩顶固接情况可以忽略而对于桩顶自由情况不能忽略的结论。

Lateral Dynamic Response of Pile Group in Double-Layered Soils during the Passage of Rayleigh Waves

Double layered soil is modelled as a Winkler foundation approximated as continuously distributed linear springs and dashpots interacting with a pile. With the help of the analytical solution of a free field horizontal displacement in layered soil during the passage of a unit amplitude Rayleigh wave, constrained end and free end pile groups in layered soils are studied. The equation of the horizontal displacement and the shear force at the top end of the pile is derived. The interaction between piles is considered by interaction factor . By parametric analysis, it is found that the effect of the Rayleigh wave interaction between piles is negligible for the constrained end pile group, but for free end pile group it is not.