冲击弹性波在衬砌脱空检测中的应用

The Application of Impact Elastic Wave in Lining Void Detection

隧道作为现代工程典型的结构形式,在交通、水利、国防等领域都发挥着极其重要的作用。各行业针对隧道衬砌施工质量,尤其对衬砌脱空状况检测的需求,显得日益突出,衬砌背后部是否存在脱空将直接影响隧道的安全性能。在综合了常用混凝土检测技术的基础上,对电磁波雷达与冲击弹性波测试系统的差异进行了分析研究,认为弹性波在一定条件下用于衬砌脱空检测更具有优越性,因此提出了采用冲击弹性波的振动特性和反射特性对隧道衬砌脱空进行检测的方法,对振动法和反射法理论进行了深入研究,结合实际工程应用实践,与电磁波雷达系统进行了应用对比,其效果显著,值得推广。

As a typical modern engineering structure, tunnel plays an extremely important role in areas such as transportation, water conservancy, and national defense. The quality of tunnel lining construction, especially for the demand of the lining concrete pavement condition detection becomes inereasingly prominent. The presence of voids behind the lining will directly affect the safety performance of the tunnel. On the basis of detection technology, the electromagnetic wave radar and the impact of elastic wave test system difference were analyzed. Tile elastic wave under certain conditions used for lining has more superiority. Therefore, the method for detecting the void of tunnel lining is put forward by using vibration characteristies and reflection characteristics of shock wave. The vibration method and the theory of reflection method were studied. Based on the actual engineering application practice, and compared with electromagnetic wave radar system application, the effect of the method above is remarkable.