探地雷达瞬时属性分析技术在岩溶涌水通道探测中的应用  

Application of GPR Instantaneous Attribute Analysis Technology in Karst Water Inrush Channel Detection

作　　者：唐申强 Tang Shenqiang(State Key Laboratory of Gas Disaster Detecting Preventing and Emergency Controlling, Chongqing 400037, China;Chongqing Research Institute, CCTEG, Chongqing 400039, China)

机构地区：[1]瓦斯灾害监控与应急技术国家重点实验室,重庆400037 [2]中煤科工集团重庆研究院有限公司,重庆400039

出　　处：《工程地球物理学报》2022年第1期1-5,共5页Chinese Journal of Engineering Geophysics

基　　金：重庆市自然科学基金项目(编号:cstc2020jcyj-msxmX0676)。

摘　　要：为了准确查明某岩溶隧道发生突水后岩溶涌水通道的分布,以便及时对岩溶水进行封堵和截流。采用探地雷达对突水后掌子面前方的岩溶构造发育情况进行了精细探测,并对采集的探地雷达数据进行了瞬时属性分析,通过希尔伯特变换提取了雷达信号中的瞬时振幅、瞬时相位和瞬时频率三种瞬时属性,将三种瞬时属性结合起来对岩溶涌水通道进行了多参数综合分析。研究结果表明,瞬时振幅可以很好地显示岩溶涌水通道的边界特征和形态大小;瞬时相位分辨率最高,能够清晰显示岩溶涌水通道内部的非均质特征;瞬时频率可以从能量衰减的角度反映岩溶涌水通道的富水性。将三种瞬时属性结合起来,相互印证、相互补充,可以避免单一波形特征分析带来的解释偏差,有效提高岩溶涌水通道探测的分辨率与准确度。In order to accurately detect the distribution of karst water inrush channels after water inrush occurs in a karst tunnel so as to plug and intercept the karst water in time,the ground penetrating radar(GPR)is used to detect karst structure in front of the tunnel face,and the instantaneous attribute of the collected GPR data is analyzed.The instantaneous amplitude,instantaneous phase and instantaneous frequency are extracted from the original ground penetrating radar signal by Hilbert transform,which are used for comprehensive analysis of karst water inrush channel.The results show that,firstly,the instantaneous amplitude attribute can clearly indicate the boundary characteristics and shape of karst water inrush channel.Secondly,the instantaneous phase attribute displays the highest resolution,which can clearly show the heterogeneous characteristics of karst water inrush channel.Thirdly,the instantaneous frequency attribute can reveal the water abundance of karst inrush channel from the perspective of energy attenuation.The three instantaneous attributes confirm and complement each other,and the combination of them can avoid the interpretation deviation caused by single waveform characteristic analysis,and effectively improve the resolution and accuracy of karst water inrush channel detection.

关 键 词：探地雷达 涌水通道 瞬时振幅 瞬时相位 瞬时频率 

分 类 号：P631.3[天文地球—地质矿产勘探]