Ground motion amplification pattern with TBM tunnels crossing soil-rock interface:Shaking table test  

作　　者：Siming Li Roberto Cudmani Mingqing Xiao Zhiming Guo Yong Yuan 

机构地区：[1]College of Civil Engineering,Tongji University,Shanghai 200092,China [2]Department of Civil and Environmental Engineering,Technical University of Munich,Mu¨nchen 81245,Germany [3]China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China [4]Public Works Construction Center,Nanjing 210019,China [5]State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China

出　　处：《Underground Space》2023年第5期202-217,共16页地下空间（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51778487&51478343);Joint Funds of the National Natural Science Foundation of China(Grant No.U1934210);National Natural Science Foundation of China Projects of International Cooperation and Exchanges(Grant No.52061135112).

摘　　要：The current aseismic design has seldom considered the effect caused by underlain tunnels.Previous studies focused on the scenarios of tunnels embedded in homogeneous soil under transverse seismic excitation.This paper aims to investigate the tunnel effect on the surface acceleration response in soil-rock strata by shaking table tests.Three sets of excitations are employed and input along the shaking table in both transverse and longitudinal directions.The soil-rock site is classified as four micro-zones with varying conditions,to mount observation stations of acceleration sensors.Dynamic characteristics of the four zones are identified by the transfer function(TF)method,and the tunnel effect on the ground acceleration response is obtained by comparing the spectral acceleration results between the free-field and ground-tunnel models.The test results indicate that the tunnel effect varies with the site conditions.Distinctively,a significant amplification effect is observed at the A4 zone,located on the soil deposit near the soil-rock interface.Then,it is proved that the scattering waves generated at the interface and the standing waves trapped between the tunnel and upper ground surface account for the amplification,revealed by the discrepancies of the TF results and acceleration details between the free-field and ground-tunnel models.

关 键 词：TUNNEL Soil-rock interface Seismic excitation Ground response Site characteristics 

分 类 号：U45[建筑科学—桥梁与隧道工程]