可液化土层对地下结构地震影响的振动台试验  

Shaking table test of seismic effect of liquefiable soil layer on underground structure

作　　者：刘春晓[1,2] 陶连金 边金[3] 张宇 冯锦华 代希彤 王兆卿 LIU Chun-xiao;TAO Lian-jin;BIAN Jin;ZHANG Yu;FENG Jin-hua;DAI Xi-tong;WANG Zhao-qing(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;China Railway Fifth Survey And Design Institute Group CO.,LTD.,Beijing 102600,China;College of Ocean Engineering,Guangdong Ocean University,Zhanjiang 524088,China;State Nuclear Electric Power Planning Design&Research Institute CO.,LTD.,Beijing 100095,China;Qingdao Conson Construction&Investment Co.,Ltd.,Qingdao 266100,China;Beijing Urban Construction Investment and Development Co.,Ltd.,Beijing 101300,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]中铁第五勘察设计院集团有限公司,北京102600 [3]广东海洋大学海洋工程学院,广东湛江524088 [4]国核电力规划设计研究院有限公司,北京1000954 [5]青岛国信建设投资有限公司,山东青岛266100 [6]北京城建兴顺房地产开发有限公司,北京101300

出　　处：《浙江大学学报（工学版）》2021年第7期1327-1338,共12页Journal of Zhejiang University：Engineering Science

基　　金：国家重点研发计划资助项目(2017YFC0805403);国家自然科学基金资助项目(41877218).

摘　　要：针对目前地铁区间隧道建设中常见的单层双跨断面形式结构,开展结构整体位于可液化土层、结构底部存在可液化土层、结构位于非液化土层3组振动台试验,分析地基土加速度、孔隙水压力和结构位移之间的关系.结果表明,地基土加速度放大系数沿埋深受地震动、地震动峰值、场地的影响展现出不同的变化规律;紧邻结构两侧位置处土体不易液化;结构底部0~45度范围内土体容易液化;液化程度最严重区域分布在结构水平两侧一定距离处和结构底部两侧位置;超孔压比数值分布大小同地震波自身Arias强度有很好的对应关系.Aiming at the common single-layer double-span cross-section structure in subway tunnel construction at present,three groups of shaking table tests were carried out,in which the liquefiable soil layer was all around the structure,at the bottom of the structure,and the structure was located in non-liquefied soil layer.Relationship among foundation soil acceleration,pore water pressure and structural displacement was analyzed.Results show that the acceleration amplification coefficient of foundation soil changes along the buried depth,which is affected by ground motions,peak values of ground motion and sites showing different variation rules.The soil adjacent to both sides of the structure is not easy to liquefaction.The soil is easy to liquefaction in the range of 45 degrees at the bottom of the structure.The most serious liquefaction area is distributed at a certain distance between the horizontal sides of the structure and on both sides of the bottom of the structure.The numerical distribution of excess pore pressure ratio corresponds well to the Arias intensity of seismic waves.

关 键 词：液化 矩形隧道 振动台试验 加速度 孔隙水压力 

分 类 号：O319.56[理学—一般力学与力学基础]