地质雷达正演模拟及在断层富水带超前地质预报的应用研究  

Study on GPR forward modeling and its application in advanced geological prediction of fault water-rich zone

作　　者：蒋建国[1] 刘程[1] 陈媛 刘孙光 JIANG Jianguo;LIU Cheng;CHEN Yuan;LIU Sunguang(School of Civil Engineering,Central South University,Changsha 410000,China)

机构地区：[1]中南大学土木工程学院

出　　处：《铁道科学与工程学报》2019年第11期2801-2808,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51378510)

摘　　要：在隧道工程施工期间,常遇到涌水、突泥等地质灾害。基于时域有限差分法,研究围岩相对介电常数和电导率对雷达效果的影响,并建立多层地质模型,研究断层破碎带在夹泥、充气、富水时的雷达图像特征规律,以此作为超前地质预报应用中地质雷达图像解译的基础。在玉磨铁路某隧道施工过程中,使用地质雷达法成功实现了对断层富水带准确判别,有效避免了灾害的发生。Geological disasters such as water gushing and mud burst often occur in the construction of the water-rich tunnel.Based on FDTD method,the influence of the change of relative dielectric constant and conductivity of surrounding rock on radar detection effect was studied.A multi-layer geological model was established to study the characteristics of radar images of fault fracture zones with mud,aerification or water-rich condition,which is used as the basis for image interpretation of geological radar in advanced geological prediction applications.During the construction of a tunnel in Yumo Railway,the geological radar method was successfully used to distinguish the fault water-rich zone accurately and effectively avoid the occurrence of disasters.

关 键 词：地质雷达 时域有限差分法 正演模拟 超前地质预报 富水带 

分 类 号：U25[交通运输工程—道路与铁道工程]