泉州火车站站前大桥桥头堡桩基设计

Pile foundation design of Quanzhou Railway Station's front bridgehead

泉州火车站站前大桥桥头堡地面下20m范围内存在严重液化土层,当基础采用桩基时,在设防地震或罕遇地震作用下,上部土层可能会完全液化,对桩身上部无法提供弹性抗力,此时的桩基实际上已成为高承台桩。针对此种情况,借助MIDAS/Gen程序建立了桩与上部结构整体分析模型,对桩基进行了水平地震作用下的力学分析,结果与采用《建筑桩基技术规范》(JGJ 94—2008)的计算值相吻合。

Serious liquefiable soil is distributed in 20m underground of Quanzhou Railway Station＇s front bridgehead.Under the action of frequent earthquake or rare earthquake,the upper soil would be completely liquefiable and can not provide elastic resistance to pile foundation in the serious liquefiable site.Therefore,the pile will become tall platform pile.According to this case,the pile-upper structure interactive element model was established by finite element software MIDAS/Gen and mechanics analysis of the pile was conducted under horizontal earthquake.It shows that the results calculated by MIDAS/Gen agree well with that calculated by Technical code for building pile foundation（JGJ 94—2008）.