隧道仰拱质量无损检测震源因素研究  

Study on Nondestructive Testing of Source Factors of Tunnel Arch Quality

作　　者：李秀 罗昊 邓飞 郑兴军 周桃生 郑佳 LI Xiu;LUO Hao;DENG Fei;ZHENG Xingjun;ZHOU Taosheng;ZHENG Jia(School of Advanced Manufacturing Engineering,University of Chongqing Posts and Telecommunications,Chongqin 400065,China;Sichuan Jintong Engineering Test and Testing Co.,Ltd.,Chengdu 610000,China)

机构地区：[1]重庆邮电大学先进制造工程学院,重庆400065 [2]四川金通工程试验检测有限公司,成都610000

出　　处：《CT理论与应用研究(中英文)》2025年第2期245-254,共10页Computerized Tomography Theory and Applications

基　　金：国家博士后基金(基于多算法融合的工业CT空心涡轮叶片壁厚检测技术研究(2021M693769));蜀道城乡集团自立科研项目(基于自动冲击震源的地震法隧道仰拱质量检测系统研发(CX202301));成都市重点研发支撑计划(隧道高温热害精准超前预判技术研究(2022YF0800001GX))。

摘　　要：为在隧道仰拱质量检测中获取高能、高频且宽频带的地震信号,本文基于有限元仿真研究锤击震源的质量、速度以及接触面积对地震波的影响。研究表明:随着重锤质量增大锤击信号的振幅线性增大,主频降低,频带宽度显著增大;随着锤击瞬时速度增大锤击信号振幅线性增大,主频略微上升,频带宽度变化规律不明显;随着重锤与地面接触面积增大,锤击信号振幅增加,主频和频宽基本不变,但高频分量能量衰减、频宽变窄。根据上述研究设计小型一体式圆头重锤并开展无损检测实验,研究表明该重锤能获得高质量地震信号,实现隧道仰拱底界面探测成像,且成像结果与实际施工情况基本吻合。本文将震源研究拓展至隧道仰拱领域,可为隧道仰拱无损检测提供参考。To obtain high-energy,high-frequency,and wide-band seismic signals in tunnel arch quality testing,the influence on seismic waves of the mass,velocity,and contact area of the hammer source was studied based on a finite element simulation.The results show that with the increase in mass of the hammer,the amplitude of the hammer signal increases linearly,the main frequency decreases,and the frequency band width increases significantly.With the increase in the instantaneous velocity of the hammering,the amplitude of the hammer signal increases linearly,the main frequency increases slightly,and the frequency bandwidth does not change significantly.With the increase in the contact area between the hammer and the ground,the amplitude of the hammer signal increases,and the main frequency and bandwidth remain basically unchanged,but the energy of the high-frequency component is attenuated and the bandwidth is narrowed.According to the above research,a small integrated round-head hammer was designed and non-destructive testing experiments were carried out,which showed that the hammer could obtain high-quality seismic signals and realize the detection and imaging of the tunnel inverted arch bottom interface,and the imaging results were basically consistent with the actual construction situation.In this work,the study of the seismic source is extended to the field of tunnel arches,and it can provide a reference for nondestructive testing of tunnel arches.

关 键 词：隧道仰拱 地震法 锤击震源 有限元仿真 

分 类 号：P631[天文地球—地质矿产勘探] U456[天文地球—地质学]