高铁隧道GPR技术研究与应用

应用基于时间域有限差分法模拟软件GPRMax2D,对高铁隧道衬砌典型的不良情况,如厚度不足、空洞和钢筋布置不合理等进行了正演模拟,得到了隧道衬砌典型不良情况的正演模拟雷达图像。结合某高铁隧道工程实际检测得到的雷达图像,对两者图像作了对比分析,总结得到了隧道衬砌不良情况雷达图像的特征规律,完善了探地雷达图像资料特征解释库,提高了识别高铁隧道衬砌典型不良情况雷达图像的可信度,为高速铁路隧道的无损检测提供了有效的依据。

THE STUDY AND APPLICATION OF GPR TECHNOLOGY FOR HIGH-SPEED RAILWAY TUNNEL

The high-speed railway tunnel lining always suffers from some adverse conditions, such as thickness lack, cavity, and un-reasonable reinforcement arrangement. In this paper, simulation of the typical adverse lining condition was introduced by using the sim-ulation software GPRMax2D based on finite-different time-domain method （ FDTD） , and the forward simulation radar images of the typ-ical adverse lining condition were obtained. In combination with the typical radar images from detection examples of a high-speed rail-way tunnel, a comparative analysis was made between them, the features and rules of the adverse lining condition were summarized, the ground-penetrating radar data feature library was improved, and the credibility of recognizing typical adverse conditions of high-speed railway tunnel was increased. These results provide the effective basis for the high-speed railway tunnel non-destructive testing.