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The nature frequency identification of tunnel lining based on the microtremor method

Underground Space 2016年第2期1卷 108-113页

作者： Yujing Jiang Yang Gao Xuezhen Wu Graduate School of Engineering Nagasaki UniversityNagasaki 852-8521Japan Key Laboratory of Structural Health Monitoring and Control Shijiazhuang Tiedao UniversityShijiazhuang 050043China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao 266510China

Many tunnels all over the world have been in service for several decades,which require effective inspection methods to assess their health ***,as a type of ambient vibration originating from natural or artificial oscillations without specific sources,has attracted more and more attentions in the recent study of the microtremor dynamic properties of concrete *** this study,the microtremors of the tunnel lining were simulated numerically based on the Distinct Element Method(DEM).The Power Spectra Density(PSD)of signals obtained from numerical simulations were calculated and the nature frequencies were identified using the peak-picking *** influences of the rock-concrete joint,the rock type and the concrete type on the nature frequencies were also *** results of a comprehensive numerical analysis show that the nature frequencies lower than 100 Hz can be *** the bonding condition becomes worse,the nature frequencies *** nature frequencies change proportionally with the normal stiffness of the rock-concrete *** the concrete grade decreases,the third mode of frequency also decreases gradually while the variation of the first two modes of frequencies can hardly be ***,the field microtremor measurements of tunnel lining were also carried out to verify the numerical results.

关键词： Tunnel lining Frequency Vibration intensity microtremor measurement Numerical simulation

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