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探地雷达(GPR)作为岩溶隧道超前地质预报的主要手段广泛运用于隧道岩溶探测,但GPR自带分析软件所得时间剖面图只能进行岩溶定性分析,无法较准确地确定岩溶的位置、大小和形状。基于此,提出一种基于GPR原始数据的单道信号计算岩溶位置和大小的方法。具体做法主要包括:先用地质雷达自带分析软件确定岩溶位于哪几道信号上,再将这几道信号的数据利用自编程序提取并作Hilbert函数变换,绘出信号的瞬时振幅、相位和频率图(三瞬图),根据每道三瞬图图像突变的位置确定岩溶的起、终点,最后联合各道计算结果确定岩溶的位置、大小和形状。上述方法在赣龙铁路中复隧道DK189+135、DK189+75断面岩溶探测中得到了成功运用。实践证明,该方法能较准确地确定岩溶的位置、大小和形状,是基于探地雷达探测岩溶分析的可行方法。
GPR is widely used in tunnel karst detection as the predominant means of advanced geological prediction in karst tunnels. However, GPR-derived time profiles can only be used for qualitative analysis of karst and can not accurately determine the location, size and shape. Based on this, a method of calculating karst position and size based on single-channel GPR raw data is proposed. The specific practices include: first with the inherent radar geologic radar software to determine which of a few karst signals located, and then the signal of these signals using self-extracting program and make Hilbert function transform, draw the signal instantaneous amplitude, phase and According to the location of the abrupt change of the image, the location and size of the karst and the shape of the karst are determined according to the calculation result of each channel. The above method has been successfully applied in the karst exploration of the cross-section DK189 + 135 and DK189 + 75 of the Gan-Long Railway. Practice has proved that this method can more accurately determine the location, size and shape of karst, and is a feasible method based on GPR exploration karst analysis.