隧道衬砌病害的探地雷达波场模拟与特征分析  

Forward modeling of tunnel lining diseases ground penetrating radar wave field and characteristics analysis

作　　者：徐浩[1] 刘江平[1] 范承余 曹进[2] 

机构地区：[1]中国地质大学(武汉)地球物理与空间信息学院,湖北武汉430074 [2]安徽省高速公路控股集团有限公司,安徽合肥230051

出　　处：《中南大学学报（自然科学版）》2013年第11期4581-4587,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(40904031);水利部公益性行业科研专项资助项目(201101028-3)

摘　　要：基于时间域有限差分法,对隧道衬砌中的脱空、离析、钢筋、钢筋下脱空和离析的波场特征进行二维正演模拟,并与实例结果对比分析。结果表明:对隧道衬砌常见病害的正演模拟能有效地为雷达资料解释提供依据;当衬砌内的脱空厚度大于电磁波在空气中传播波长的1/4时,能较准确地计算出脱空厚度;根据脱空、离析、钢筋的波场特征,能够从雷达剖面中正确地分辨出这些常见病害情况;当钢筋下出现脱空和离析现象时,从雷达剖面图中能量、相位的变化以及多道频谱图中能量的变化只能清楚地识别出钢筋下的脱空现象。Two-dimensional forward modeling was taken through the finite-difference time domain method for the wave field characteristics of several kinds of diseases in ~mel lining, including disengaging, segregation, reinforced deletion, disengaging and segregation under reinforcements. Then the simulation and practical works were compared and analyzed. The results show that forward modeling of the common tunnel lining diseases can effectively provide evidence for interpretation of radar data; the thickness of disengaging can be accurately calculated as long as this thickness is greater than one quarter of the wavelength with which electromagnetic waves propagate in the air; these common diseases from the radar section can be resolved by the radar wave field characteristics of disengaging, segregation and reinforcement; when disengaging and segregation appear under reinforcements, the disengaging under reinforcements can be recognized clearly from the change of energy and phase in radar sections as well as the change of energy in the multi-channel spectra.

关 键 词：探地雷达 时间域有限差分 隧道衬砌病害 频谱分析 

分 类 号：P631[天文地球—地质矿产勘探]