工程地质学报2017，Vol.25Issue(3)：648-656,9.DOI:10.13544/j.cnki.jeg.2017.03.010
基于振动台模型试验的特大断面隧道地震动态响应研究
SEISMIC RESPONSES OF LARGE SECTION TUNNEL BASED ON SHAKING TABLE MODEL TEST
摘要
Abstract
This paper is based on the enlargement project of Jinjishan Tunnel in Fuzhou 2nd ring road.A 1/30 downscale model for the large section tunnel is fabricated.The earthquake-simulating tests with 21 loading cases are carried out.The seismic responses of acceleration and normal pressure upon the tunnel model are focused.The PGA amplification coefficient is defined as the ratio between peak seismic acceleration and peak ground acceleration.The PGA amplification coefficients upon tunnel model increase logarithmically with ground elevation.The ground elevation effect distinguishes from other regular grounds.With the augment of ground motion amplitude,the PGA amplification coefficients upon tunnel model decrease gradually,and the influence of frequency characteristic on the ground elevation effect vanishes gradually.The PEP oscillation coefficient is defined as the ratio between peak seismic and static normal pressures.With the augment of ground motion amplitude,the PEP oscillation coefficients upon sidewall and arch increase linearly in general,while the PEP oscillation coefficients upon crown and invert always remain in a small range.In the aseismic design of larger section tunnel,these results can provide some reference to the evaluation of contact pressure between the lining and the ground.关键词
特大断面隧道/地震动响应/振动台试验/PGA放大系数/PEP震荡系数Key words
Large section tunnel/Seismic response/Shaking table model test/PGA amplification coefficient/PEP oscillation coefficient分类
交通工程引用本文复制引用
关振长,罗志彬,徐遒,陈仁春,耿萍..基于振动台模型试验的特大断面隧道地震动态响应研究[J].工程地质学报,2017,25(3):648-656,9.基金项目
国家自然科学基金(51378433,51678155)资助. （51378433,51678155）
