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

作　　者：Yujing Jiang Yang Gao Xuezhen Wu 

机构地区：[1]Graduate School of Engineering,Nagasaki University,Nagasaki 852-8521,Japan [2]Key Laboratory of Structural Health Monitoring and Control,Shijiazhuang Tiedao University,Shijiazhuang 050043,China [3]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 Technology,Qingdao 266510,China

出　　处：《Underground Space》2016年第2期108-113,共6页地下空间（英文）

基　　金：Development of this study is supported by the Civil Engineering Division,Nagasaki Prefectural Government.

摘　　要：Many tunnels all over the world have been in service for several decades,which require effective inspection methods to assess their health conditions.Microtremor,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 structures.In 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 method.The influences of the rock-concrete joint,the rock type and the concrete type on the nature frequencies were also evaluated.The results of a comprehensive numerical analysis show that the nature frequencies lower than 100 Hz can be identified.As the bonding condition becomes worse,the nature frequencies decrease.The nature frequencies change proportionally with the normal stiffness of the rock-concrete joint.As 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 identified.Additionally,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 

分 类 号：TU5[建筑科学—建筑技术科学]