ANALYSIS OF INFLUENCING FACTORS ON SEISMIC RESPONSES OF TUNNEL-SOIL-GROUND STRUCTURE INTERACTION SYSTEM
WANG Guobo1，WANG Yaxi1，CHEN Bin3，YU Yanli2
(1. Hubei Key Laboratory of Roadway Bridge and Structure Engineer，Wuhan University of Technology，Wuhan 430070，China；
2. School of Civil Engineering and Architecture，Wuhan University of Technology，Wuhan 430070，China；
3. Ningbo Rail Transit Project Construction Headquarter，Ningbo 315012，China)
Abstract：More and more crossing projections will appear with the further development and utilization of urban limited underground resources. In order to discuss the mutual influence between underground structure and above structure seismic responses，a tunnel-soil-adjacent frame structure computation model was established and the key influence factors on system seismic responses were studied systematically，which include：tunnel depth and radius，the character of layered soil，the ratio of frame height to width，the distance between frame structure and tunnel center，the characteristics of input seismic waves. The computation results show that：(1) The existence of tunnel almost have no influence on system natural frequencies，while frame structure has a significant influence on system frequency character. (2) The main influence of tunnel on frame structure is come from tunnel radius because the bigger tunnel size can break the propagation of seismic wave and some degree of shock absorption can be achieved. (3) The influence of frame structure on tunnel seismic response is insignificant because the frame structure considered in the paper is too light；(4) The characteristics of input seismic waves have a significant influence on system seismic response because the frequency contents and frequencies of frame structure itself. (5) System seismic responses were influenced greatly under multi-layer soil and one-layer soil because soil stiffness was changed under different soil models. The research results can provide references for preliminary determine the mutual influence on their seismic responses qualitatively.
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2015, Vol. 34 
