College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China.
Key Laboratory for Resilient Infrastructures of Coastal Cities MOE, Shenzhen University, Shenzhen 518060, China.
Sensors (Basel). 2022 Dec 11;22(24):9702. doi: 10.3390/s22249702.
Voids, a common defect in tunnel construction, lead to the deterioration of the lining structure and reduce the safety of tunnels. In this study, ground-penetrating radar (GPR) was used in tunnel lining void detection. Based on the finite difference time domain (FDTD) method, a forward model was established to simulate the process of tunnel lining void detection. The area of the forward image and the actual void area was analyzed based on the binarization method. Both the plain concrete and reinforced concrete lining with various sizes of air-filled and water-filled voids were considered. The rationality of the model was verified by measured data. It was observed that the response mode of voids can be hyperbolic, bowl-shaped, and strip-shaped, and this depends on the void's width. Compared with the air-filled voids, water filling increases the response range of the voids and produces a virtual image. Although the diffracted wave caused by a steel bar will bring about significant interference to the void response, the center position of the voids can be accurately located using 3D GPR.
空洞是隧道施工中常见的缺陷，会导致衬砌结构恶化，降低隧道的安全性。在本研究中，探地雷达（GPR）用于隧道衬砌空洞检测。基于时域有限差分（FDTD）方法，建立了正演模型来模拟隧道衬砌空洞检测过程。基于二值化方法，分析了正演图像的面积和实际空洞面积。考虑了具有不同尺寸的充气和充水空洞的素混凝土和钢筋混凝土衬砌。通过实测数据验证了模型的合理性。结果表明，空洞的响应模式可以是双曲线形、碗形和条形，这取决于空洞的宽度。与充气空洞相比，充水会增加空洞的响应范围并产生虚像。尽管钢筋引起的绕射波会对空洞响应产生显著干扰，但使用 3D-GPR 可以准确定位空洞的中心位置。
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