地质雷达超前地质预报正演模拟及应用研究  

Advance geological forecast forward modeling of geological radar and its application

作　　者：朱自强[1] 郭有军 刘涛影 

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083 [2]中南大学资源与安全工程学院,湖南长沙410016

出　　处：《铁道科学与工程学报》2018年第1期148-155,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(41374120);广东交通科技计划资助项目(201502008)

摘　　要：针对地质条件复杂地区隧道工程建设过程中容易发生涌水、突泥、冒顶和塌方等地质灾害,为确保隧道施工的质量和施工安全,有必要在施工前期进行隧道的超前预报。基于时域有限差分原理,分别建立2层和3层地层模型,单个充水、充泥和充气溶洞模型,以及断层破碎带异常体模型等模拟高频电磁波在具有波阻抗差异的介质中的传播过程,利用地质雷达剖面,分析对比不同模型的溶洞和断层破碎带的分布特征规律,为实际工程应用提供理论基础,同时以六月田隧道和马华隧道为例,研究不良地质体溶洞和断层在地质雷达剖面的特征规律。In order to ensure the quality of tunnel construction and construction safety, it is necessary to forecast the tunnel in the early stage of construction in the course of the tunnel construction in the complex geological conditions, such as gushing water, sudden mud, roof fall and landslide. Based on the FDTD theory, two-layer and three-layer models, single filling water, filling mud, inflatable cave model, fault fracture zone anomaly model were established to simulate the propagation of high-frequency electromagnetic waves in medium with wave impedance difference. By using the geological radar profiles, the distribution characteristics of karst caves and fracture zones of different models were compared and analyzed, which provides a theoretical basis for the practical engineering application. Meanwhile, taking the Liuyuetian tunnel and the Mahua tunnel as example, the characteristics of the geological cave and fault in the geological radar profile were studied.

关 键 词：地质雷达 正演模拟 隧道超前预报 溶洞 断层破碎带 

分 类 号：U45[建筑科学—桥梁与隧道工程]