摘要
为系统研究砂-细粒混合料液化场地地铁车站结构的地震响应,依托中国地震局兰州地震研究所地震模拟振动台系统,开展了砂-细粒混合料液化场地地铁车站结构振动台模型试验。文章详细阐述场地模型的制备与车站结构的设计和制作、各类传感器的布设、地震动波形选取与工况设计等内容,重点分析了车站结构及模型场地的加速度响应空间分布特征。结果表明:在小幅值地震动加载过程中,可观察到土体开裂现象,当地震动峰值加速度(PGA)增长到0.2g时,可观察到车站结构的明显上浮以及土体液化现象,且随着孔隙水压力的增长,土体表面开始喷砂冒水;PGA数据表明,地震动在地基模型和地铁车站模型上均存在放大作用,随着高度的增加,放大系数逐渐增大,并且地铁车站模型的存在会影响到模型场地的动力响应;应变分析中发现车站中柱的应变反应最大,最大值出现在上层中柱顶部以及下层中柱底部的位置。
To systematically investigate the seismic response of subway station structures in sand-fine liquefiable sites,a series of shaking table model tests were conducted using the earthquake simulation shaking table system at the Lanzhou Institute of Seismology,China Earthquake Administration.This study details the preparation of the site model,the design and fabrication of the subway station structure,the layout of sensors,the selection of ground motion waveforms,and loading protocols.Emphasis is placed on analyzing the spatial distribution characteristics of acceleration responses in both the station structure and the model site.The results indicate that soil cracking appeared during low-amplitude seismic loading.When the peak ground acceleration reached 0.2 g,the station structure uplifted remarkably,the soil liquefied,and the pore water pressure increased,accompanied by sand boiling and water ejection.Acceleration data revealed amplification effects in both the foundation model and the subway station model,with amplification factors increasing with height.The presence of the subway station structure notably influenced the dynamic response of the model site.Strain analysis demonstrated that the maximum strain response occurred in the central columns of the station,with peak values observed at the top of the upper central column and the bottom of the lower central column.
作者
程艺梅
张川川
裴保国
肖逸凡
王冰
CHENG Yimei;ZHANG Chuanchuan;PEI Baoguo;XIAO Yifan;WANG Bing(Taiyuan Rail Transit Group Co.,Ltd.,Taiyuan 030001,Shanxi,China;Shanxi Transportation Technology Research&Development Co.,Ltd.,Taiyuan 030032,Shanxi,China;School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China)
出处
《地震工程学报》
北大核心
2025年第4期811-821,共11页
China Earthquake Engineering Journal
基金
山西省基础研究项目面上项目(202203021221298)
太原轨道交通1号线科研项目(010100362021035)。
关键词
振动台试验
液化
砂-细粒混合料
地铁车站
动力响应
shaking table test
liquefaction
sand-fine mixture
subway station
dynamic response
