瑞雷面波法在铁路隧道仰拱厚度检测中的应用

Application of Rayleigh Wave Method in Detection of Invert Thickness of Railway Tunnels

隧道仰拱是承受列车荷载的主要受力结构,其厚度不足是铁路隧道检测中较严重的病害之一。因此,针对目前常用的钻芯法、地质雷达法在隧道仰拱厚度检测存在的不足,基于瑞雷面波的频散特性,文章开展了瑞雷面波法应用于铁路隧道仰拱厚度检测的试验研究,提出了瑞雷面波法检测仰拱厚度观测系统参数设置及震源-检波器接收系统激发主频参数建议,实现了对隧道仰拱厚度的准确定量检测,通过钻孔验证了检测结果的准确性。

Tunnel invert is the main structure bearing the train load,and its insufficient thickness is one of the more serious defects in railway tunnel quality detection.Therefore,in view of the shortcomings of the common core drilling method and geological radar method in detection of tunnel invert thickness,and based on the dispersion characteristics of Rayleigh wave,the experimental study is carried out for the application of Rayleigh wave method in detecting invert thickness of railway tunnels.Some suggestions are put forward in terms of the relevant parameters of the observation system and the parameters of excited dominant frequency of the receiving system,to achieve accurate quantitative detection of the tunnel invert thickness,and the accuracy of the detection results of the Rayleigh wave method is verified by drilling holes.