Using GPRMax basd on the theory of finite difference time domain (FDTD), and taking into account three different frequency antennae of 400 MHz, 900 MHz, and 1500 MHz, the author simulated the image characteristics of the ground penetrating radar reflection and interference signal obtained from the objects inside tunnel lining, including different steel mesh densities, different rebar diameters, steel arches and air layers. An experiment of ground penetrating radar survey was carried out on concrete specimen, the Kirchhoff migration was used to process the numerical simulations and experimental data, so as to suppress the diffracted wave and multiple wave coming from rebar mesh and improve range resolution of weak reflection signal under steel mesh. Based on the comparative analysis of the numerical simulation data and the experimental data on concrete specimen and tunnel lining detection results, the authors reached some conclusions which can be used as a reference for obtaining better detection results of ground penetrating radar survey in tunnel lining.
肖都, 李文杰, 郭鹏. 基于GPRMax的隧道衬砌检测数值模拟及应用[J]. 物探与化探, 2015, 39(4): 855-859.
XIAO Du, LI Wen-Jie, GUO Peng. The tunnel lining detection numerical simulation based on GPRMax and its application. Geophysical and Geochemical Exploration, 2015, 39(4): 855-859.
[1] 徐浩,刘江平,范承余,等.隧道衬砌病害的探地雷达波场模拟与特征分析[J].中南大学学报:自然科学版,2013,44(11):4581-4587.[2] 黄玲,曾昭发,王者江,等. 钢筋混凝土缺陷的探地雷达检测模拟与成像效果[J].物探与化探,2007, 31(2):181-185.[3] 徐茂辉,谢慧才.混凝土结构雷达检测中的钢筋相互干扰研究[J]. 四川建筑科学研究,2006,32(6):98-102.[4] 王正成,吴晔.探地雷达隧道衬砌质量检测技术[J]. 物探与化探,2013,37(6):1152-1156.[5] 李大心.探地雷达方法及应用[M]. 北京:地质出版社,2000.[6] Yee K S. Numerical solution of initial boundary value problem involving Maxell equations in isotropic media[J]. IEEE Trans Antennas Propagate,1966,14(3):302-307.[7] Giannopoulos A.The investigation of transimissionline matrix and finite-difference time-domain methods for the forward problem of ground probing radar[D].University of York, Department of Electronics, York, UK; 1997.[8] GPRMax2D: http://www.gprmax.org.[9] 胡平,肖都,方慧.高频探地雷达技术在香港工程检测中的应用[J].物探与化探,2004,28(4):361-364.[10] 曾绍发,刘四新,王者江,等.探地雷达方法原理及应用[M].北京:科学出版社,2000.
