基于探地雷达的隧道衬砌空洞高精度正演识别研究
发布时间：2018-08-28 05:59
【摘要】：隧道衬砌空洞易引发衬砌破坏、渗漏水等工程问题,但因衬砌内部金属(如钢筋、钢拱架)对雷达波的屏蔽作用,会增加雷达剖面的复杂性,进而影响检测效果。依托MATLAB软件平台,采用高阶时域有限差分法分别对400 MHz天线和900 MHz天线时隧道衬砌矩形空洞和三角形空洞进行正演模拟。结果表明:高阶时域有限差分法能高精度模拟雷达波在衬砌中的传播特性,展示衬砌中钢筋、空洞、工字钢的反射波、绕射波的能量、振幅、相位特征;900 MHz天线可分辨出长度在0.3 m及以上的界面,远高于400MHz天线的检测精度,但检测界面相对于真实界面小。
[Abstract]:Tunnel lining cavities can easily lead to lining damage, leakage and other engineering problems, but because of the shielding effect of lining interior metal (such as steel bar and steel arch frame) on radar wave, the complexity of radar profile will be increased and the detection effect will be affected. Based on the MATLAB software platform, the forward modeling of tunnel lining rectangular cavity and triangular cavity with 400 MHz antenna and 900 MHz antenna is carried out by using high-order finite-difference time-domain method. The results show that the high-order finite-difference time-domain method can simulate the propagation characteristics of radar waves in lining with high precision, and show the energy and amplitude of steel bar, cavity, I-beam reflected wave and diffraction wave in lining. The phase characteristic 900 MHz antenna can distinguish the interface with length of 0.3 m or more, which is much higher than the detection precision of 400MHz antenna, but the detection interface is smaller than the real interface.
【作者单位】： 上海东亚地球物理勘查有限公司;中铁西南科学研究院有限公司;
【分类号】：U455.91
[Abstract]:Tunnel lining cavities can easily lead to lining damage, leakage and other engineering problems, but because of the shielding effect of lining interior metal (such as steel bar and steel arch frame) on radar wave, the complexity of radar profile will be increased and the detection effect will be affected. Based on the MATLAB software platform, the forward modeling of tunnel lining rectangular cavity and triangular cavity with 400 MHz antenna and 900 MHz antenna is carried out by using high-order finite-difference time-domain method. The results show that the high-order finite-difference time-domain method can simulate the propagation characteristics of radar waves in lining with high precision, and show the energy and amplitude of steel bar, cavity, I-beam reflected wave and diffraction wave in lining. The phase characteristic 900 MHz antenna can distinguish the interface with length of 0.3 m or more, which is much higher than the detection precision of 400MHz antenna, but the detection interface is smaller than the real interface.
【作者单位】： 上海东亚地球物理勘查有限公司;中铁西南科学研究院有限公司;
【分类号】：U455.91
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