An innovative vehicle-mounted GPR technique for fast and efficient monitoring of tunnel lining structural conditions

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI:10.1016/j.csndt.2016.10.001

Yuewen Zan , Zhilin Li , Guofeng Su , Xiyuan Zhang

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引用次数: 27

Abstract

The health status of a railway tunnel should be regularly inspected during its service period to ensure safe operation. Ground-penetrating radar (GPR) has been used as a key technique for tunnel detection; however, so far, the measurements of GPR are only obtainable in contact mode. Such methods cannot meet the requirements of the operational tunnel disease census and regular inspections. Therefore, a new method—vehicle-mounted GPR with long-range detection—has been developed. It consists of six channels. The distance from its air-launched antenna to the tunnel lining is approximately 0.93 m–2.25 m. The scanning rate of each channel is 976 1/s. When the sampling point interval is 5 cm, the maximum speed can reach up to 175 km/h. With its speed and air-launched antenna, this system has a significant advantage over existing methods. That is, for an electrified railway, there is no need for power outages. Indeed, the proposed system will not interrupt normal railway operation. Running tests were carried out on the Baoji–Zhongwei and Xiangfan–Chongqing railway lines, and very good results were obtained.

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一种创新的车载探地雷达技术，用于快速有效地监测隧道衬砌结构状况

铁路隧道在使用期间应定期检查隧道的健康状况，以确保隧道的安全运行。探地雷达(GPR)已成为隧道探测的关键技术;然而，到目前为止，探地雷达的测量只能在接触模式下获得。这种方法不能满足实际隧道病害普查和定期检查的要求。为此，研制了一种新型的车载探地雷达远程探测方法。它由六个频道组成。从其空中发射天线到隧道衬砌的距离约为0.93 m - 2.25 m。每个通道的扫描速率为976 1/s。当采样点间隔为5 cm时，最高速度可达175 km/h。凭借其速度和空射天线，该系统比现有方法具有显著优势。也就是说，对于电气化铁路来说，不需要停电。事实上，拟议中的系统不会中断正常的铁路运营。在宝鸡-中卫和襄樊-重庆铁路线上进行了运行试验，取得了良好的效果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Case Studies in Nondestructive Testing and Evaluation

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