摘要
以南京某地铁车站为研究背景,考虑近、远场地震动作用,研究可液化场地上三跨三层地铁车站结构大型振动台模型试验中存在的问题和解决方法,包括柔性模型箱、动态数据采集系统的研制和结构模型、地基土相似准则的确定.测试地铁车站结构的加速度、水平位移、应变反应和地基土孔隙水压力、加速度、震陷及作用于侧墙的动土压力反应.结果表明:在近、远场地震动作用下地基土呈现低频放大现象,由于近、远场地震动的频谱特性不同,放大效应的程度和频率范围差异较大;在远场强地震动作用下地表浅层土的基频与远场地震动的主频接近,地表浅层土的地震动放大效应显著;地下结构的存在显著影响周边土体的地震动特性.
A model structure of three-story and three-span subway station at liquefiable ground was analyzed considering the far field and the near field ground motion based on a metro station in Nanjing. Problems existed in the large-scale shaking table model test were discussed and the relevant solutions were proposed, which included the development of flexible box and dynamic data acquisition system, as well as the determination of structure and soil＇s similarity criterion. Parameters such as acceleration, horizontal displacement, strain response of the station, and the pore water pressure, acceleration, seismic subsidence of soil and dynamic soil pressure on the sidewall were measured. Results show that the soil under near field and far field ground motion presents an amplification phenomenon with low frequency. However, the degree of amplification effect and the frequency range appear to be a great difference for the distinction of spectrum characteristics between near field and far field. The fundamental frequency of shallow soil is close to the dominant frequency of the motion when it comes to the far field motion; the soil＇s amplification effect seems to be significant. The existence of the underground structure has remarkable influence on the seismic dynamic characteristics of adjacent soil.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2010年第10期1955-1961,共7页
Journal of Zhejiang University：Engineering Science
基金
国家自然科学基金资助项目(90715018
90715035)
国家公益性行业科研专项资助项目(200808022)
江苏省高校自然科学重大基础研究资助项目(08KJA560001)
关键词
振动台模型试验
近远场地震动
可液化场地
地铁车站结构
相似比设计
shaking table model test
far field and near field ground motion
liquefiable ground
subway station structure
similarity ratio design
