地震荷载作用下水泥搅拌桩的动力响应

Seismic Response of Composite Foundation with CDM Piles

将Ｇａｚｅｔａｓ的动力Ｗｉｎｋｌｅｒ模型应用于水泥搅拌桩复合地基的抗震分析，并将该地基模型推广到更加符合于工程实际的双层地基。文中详细探讨了软土地基剪切波速、软土层厚度及地震频率对水泥搅拌桩单桩最大弯矩的影响，给出了桩顶铰接时桩顶力的动相互作用系数。在计算群桩效应时根据柔性桩的特性，将Ｇａｚｅｔａｓ所用的方法做了进一步简化。本文为研究“浮桩”基础（如油罐地基等）提供了一个初步的分析方法，尤其对水泥搅拌桩复合地基抗震设计有指导意义。

A model proposed by Gazetas etc,which estimated the dynamic interaction between two vertical end bearing piles,is now simplified and applied to floating piles subjected to seismic waves.The problems have also been solved when the piles with initial loads embedded in two layered soil.The influences of the S wave velocity,thickness and seismic frequency on the maximum moment of pile are studied in this paper.The dynamic interaction factor is deduced when the pile heads are hinged.