基于时域有限差分法的探地雷达数值模拟及在隧道超前地质预报中的应用  

Numerical simulation of GPR based on finite-differencetime-domain method and its application in tunnel geological forecasting

作　　者：阎渊 柴伦炜 黄勇[1,2] 付伟 赵文[1,2] 王朋 YAN Yuan;CHAI Lunwei;HUANG Yong;FU Wei;ZHAO Wen;WANG Peng(China Railway First Survey&Design Institute Group Co.,Ltd.,Xi'an 710043,China;Shaanxi Provincial Key Laboratory of Railway and Underground Transportation Engineering,Xi'an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043 [2]陕西省铁道及地下交通工程重点实验室,西安710043

出　　处：《世界地质》2024年第4期566-573,共8页World Geology

基　　金：中国铁建科技重大专项(2023-Z03);陕西省科技厅重点研发计划项目(2023-YBSF-238)。

摘　　要：为准确识别探地雷达反射波形特征,笔者采用有限差分方法分别建立岩溶、岩性接触带以及断层破碎带模型,模拟隧道超前地质预报中遇到的典型不良地质体。通过分析其反射波波形特征,对比了西康高铁以及新西成铁路工程实例中岩溶和断层破碎带预报结果,结果表明模拟的雷达波形特征可以作为探地雷达预报典型不良地质构造时参考的波性特征,可以提高预报结果的准确性。To accurately identify the reflection waveform characteristics of ground penetrating radar(GPR),the authors employed the finite-difference method to establish models for karst model,lithologic contact zone model,and fault fracture zone model.These models simulate typical unfavorable geological bodies encountered in tunnel geological forecasting.By analyzing the waveform characteristics of reflected waves,the study compares forecast results of karst structures and fault fracture zones in the engineering cases of the Xi an-Kunming High-Speed Railway and the New Xi an-Chengdu High-Speed Railway.Results indicate that the simulated radar waveform characteristics can serve as reference wave features for forecasting typical unfavorable geological bodies using GPR,thereby enhancing the accuracy of forecast results.

关 键 词：探地雷达 模拟 时域有限差分 不良地质体 超前地质预报 

分 类 号：U452[建筑科学—桥梁与隧道工程]