饱和砂土地铁车站的振动台试验研究  

Research on vibrating table model test of subway station in saturated sandy soil

作　　者：邵帅[1] 邵生俊[1,2] 马纯阳 王平 SHAO Shuai;SHAO Shengjun;MA Chunyanng;WANG Ping(Institute of Geotechnical Engineering,Xi'an University of Technology,Xi′an 710048,China;Shaanxi Key Laboratory of Loess Mechanics and Engineering,Xi′an,710048 China)

机构地区：[1]西安理工大学岩土工程研究所,西安710048 [2]陕西省黄土力学与工程重点实验室,西安710048

出　　处：《世界地震工程》2019年第4期162-170,共9页World Earthquake Engineering

基　　金：国家自然科学基金面上项目(11572245)

摘　　要：地震作用下,饱和砂土地层地铁车站的动力反应特征是城市轨道工程抗震的关键问题。以太原地铁新近沉积粉细砂地层地铁工程为对象,通过模拟地震运动输入的饱和砂土地基地下结构的振动台模型试验,分析了不同峰值加速度地震作用下饱和砂土与地下结构相互作用的动力反应性状。研究了地震波作用的放大效应与频率特征,动孔压比增长发展过程和液化区域分布,以及动土压力的变化规律。表明加速度放大系数为1.5~2.0;0.1~0.25g峰值加速度地震作用下饱和砂土均产生动孔隙水压力累计发展;0.3g峰值加速度地震作用下饱和砂土产生液化,抑制了土与地下结构的振动放大效应,地表面大量冒水,结构模型出现了明显上浮,地下结构两侧产生震陷。Under the action of earthquake,the dynamic response characteristics of subway station in saturated sandy soil are the key problem of seismic resistance in urban rail Transit.Taking the vibration model test of subway station in saturated sandy soil in Taiyuan as an example,the dynamic response characteristics of interaction between saturated sand and underground structure under seismic waves with different peak ground accelerations(PGAs)were analyzed.The amplification effect and frequency characteristics of seismic waves,the growth and development of dynamic pore water pressure,the distribution of liquefaction region,and the variation law of dynamic earth pressure were studied.The results are as follows.The acceleration amplification factor is 1.5-2.0.Dynamic pore water pressure in saturated sand is accumulated under seismic waves with PGA range from 0.1 to 0.15g.Under the seismic wave with PGA of 0.3g,the saturated sandy soil liquefies,which inhibited the amplification effect of sand and underground structure on the seismic wave,and a great deal of water spurted out of ground,and the structure model appeared to uplift obviously,and seismic depression occurred on both sides of the underground structure,and the ground surface was flooded.

关 键 词：饱和砂土 液化 地铁车站 振动台试验 结构上浮 

分 类 号：TU443[建筑科学—岩土工程]