可液化场地高承台群桩-土-桥梁结构地震相互作用振动台试验  

Shaking Table Test for Seismic Interaction of Pile Groups-soil-bridge Structure with Elevated Cap in Liquefiable Ground

作　　者：唐亮[1] 凌贤长[1] 徐鹏举[1] 高霞[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《中国公路学报》2010年第4期51-57,共7页China Journal of Highway and Transport

基　　金：国家自然科学基金重大研究计划项目(90815009);国家自然科学基金项目(50378031);国家西部交通建设科技项目(2009318000100);教育部留学回国人员科研启动基金项目(2010-37)

摘　　要：采用高承台群桩-独柱墩结构体,进行可液化场地群桩-土-桥梁结构地震相互作用振动台试验,再现自然地震触发地基液化及桩基破坏等宏观现象;通过试验监测了液化场地中地基的加速度、孔压反应以及桩-柱墩的加速度、位移、应变反应和上部结构的加速度反应等。结果表明:输入地震波幅值和埋深是影响砂层孔压的重要因素;地震作用中,随着场地液化的发展,自下而上砂层加速度先逐渐减弱后逐渐放大;高承台桩基地震响应与土层土性、地震动大小、场地液化程度等密切相关,地震作用下场地液化容易诱发高承台群桩体系的倒塌。Using a pile group supported bridge structure model with elevated cap and single column pier,a shaking table test was performed to study seismic pile groups-soil-bridge structure interaction and to reproduce the macro-phenomena of soil liquefaction and destruction on piles in liquefiable ground during earthquake.The acceleration and pore pressure of liquefiable ground,acceleration,displacement and strain response of the pile group-column pier-superstructure system were monitored during the test.The results indicate that the input acceleration amplitude and burial depth are the important factors which affect pore pressure of sandy layer.Acceleration response of sand layer from bottom to top appears to transform from gradual weakening to gradual magnification with the development of ground liquefaction.The seismic response of elevated cap pile foundation is closely related to the properties of soil layer amplitude of input earthquake motion and the level of ground liquefaction.The system is prone to collapse as a result of strong liquefaction under seismic effect.

关 键 词：桥梁工程 高承台群桩 振动台试验 地震响应 可液化场地 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]