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隧道地质超前预报在隧道工程施工中有着重要的作用,探地雷达法(GPR)作为隧道地质超前预报方法之一,具有探测对施工干扰小、探测效率高的优点,但在图像解译和探测的深度方面存在不足.本文分析GPRMAX正演模拟的基础理论,并讨论了二维有限差分法(FDTD)基本参数的选取,对隧道前方的不良地质体进行正演数值模拟,得到不同地质体的反射图像特征,并结合工程实例,说明该正演模拟能够指导解译工作.
As one of the advanced methods of tunnel geological prediction, GPR has the advantages of low detection interference and high exploration efficiency. However, in the field of image interpretation and detection Depth analysis.This paper analyzes the basic theory of GPRMAX forward modeling and discusses the selection of the basic parameters of two-dimensional finite difference method (FDTD), forward modeling of the bad geological body in front of the tunnel, Reflect the image features, and combined with engineering examples, indicating that the forward modeling can guide the interpretation work.