Effect of trigger system on experimental dispersion characteristics of active surface wave testing

作     者：Lin Shibin Jeramy C.Ashlock Zhu Liming Qin Zexiang Li Bo Zhu Xingji Zhai Changhai Lin Shibin;Jeramy C.Ashlock;Zhu Liming;Qin Zexiang;Li Bo;Zhu Xingji;Zhai Changhai

作者机构：State Key Laboratory of Precision BlastingJianghan UniversityWuhan 430056China Hubei Key Laboratory of Blasting EngineeringJianghan UniversityWuhan 430056China Department of CivilConstruction&Environmental EngineeringIowa State UniversityAmesIA 50010USA Wuhan Airport Road Development Co.Ltd.Wuhan 430065China School of Civil and Environmental EngineeringHarbin Institute of TechnologyShenzhen 518055China Key Lab of Structures Dynamic Behavior and Control of the Ministry of EducationHarbin Institute of TechnologyHarbin 150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disaster of the Ministry of Industry and Information TechnologyHarbin Institute of TechnologyHarbin 150090China 

出 版 物：《Earthquake Engineering and Engineering Vibration》 (地震工程与工程振动（英文刊）)

年 卷 期：2024年第23卷第2期

页      面：311-318页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 0814[工学-土木工程] 

基　　金：Natural Science Foundation of Hubei Province of China for Distinguished Young Scholars (2023AFA099) Natural Science Foundation of Hubei Province of China for Key Projects (Innovation Group) (2023AFA030) National Natural Science Foundation of China (52178471)。 

主　　题：site investigation surface waves data acquisition dispersion 

摘      要：A trigger system is typically employed in active seismic testing to trigger and synchronize multichannel surface wave data acquisition.The effect of the trigger system on the dispersion image of surface waves is empirically known to be negligible,however,theoretical explanation regarding the effect of the trigger system is insufficient.This study systematically examines the theory for surface wave dispersion analysis and proves that the effect of the trigger system on a dispersion image is negligible via a solid theoretical explanation.Subsequently,based on the new theoretical explanation,an alternative method that uses only the relative phase difference between sensors to extract dispersion characteristics with better conceptual clarity is proposed.Two active surface wave testing cases are considered to validate the theory and method.The results indicate that(1)an accurate trigger system is not necessary for surface wave data acquisition,and(2)it is unnecessary to assume that the impact point is the generation point of the surface waves for the experimental dispersion analysis.