GPR signal enhancement using band-pass and K-L filtering: a case study for the evaluation of grout in a shielded tunnel

The rapidness, non-destructiveness and high precision of ground penetrating radar (GPR) technology has enabled it to be widely and increasingly used in tunnel detection. However, data acquisition was usually restricted by physical and many other limitations. In order to improve the signal-to-noise ratio, band-pass and Karhunen–Loeve (K–L) filtering are recommended. An evaluation of Yingbin No. 3 Road Tunnel is presented to illustrate the effectiveness of GPR in the inspection of the thickness of the grouting layer behind the segment and the function of the two methods mentioned above. The advantages and limitations of these two processing methods are discussed in this paper and suggestions are provided.

[1]  Maksim Bano,et al.  Modelling of GPR waves for lossy media obeying a complex power law of frequency for dielectric permittivity , 2004 .

[2]  I. F. Jones,et al.  SIGNAL‐TO‐NOISE RATIO ENHANCEMENT IN MULTICHANNEL SEISMIC DATA VIA THE KARHUNEN‐LOÉVE TRANSFORM* , 1987 .

[3]  R. Olmon,et al.  Antenna–load interactions at optical frequencies: impedance matching to quantum systems , 2012, Nanotechnology.

[4]  Fengshou Zhang,et al.  Evaluation of grout behind the lining of shield tunnels using ground-penetrating radar in the Shanghai Metro Line, China , 2007 .

[5]  Jens Tronicke,et al.  Bayesian frequency-domain blind deconvolution of ground-penetrating radar data , 2011 .

[6]  J. Bradford.  Measuring Water Content Heterogeneity Using Multifold GPR with Reflection Tomography , 2008 .

[7]  Mrinal K. Sen,et al.  Split-step Fourier migration of GPR data in lossy media , 2006 .

[8]  John H. Bradford,et al.  Frequency-dependent attenuation analysis of ground-penetrating radar data , 2007 .

[9]  Ettore Cardarelli,et al.  Evaluation of tunnel stability using integrated geophysical methods , 2003 .

[10]  Eiji Sakurada,et al.  GPR rapid survey system for small-diameter tunnels , 2002, International Conference on Ground Penetrating Radar.

[11]  Jianghai Xia,et al.  Application of deterministic deconvolution of ground-penetrating radar data in a study of carbonate strata , 2004 .

[12]  E. Forte,et al.  2-D and 3-D processing and interpretation of multi-fold ground penetrating radar data:a case history from an archaeological site , 1999 .

[13]  M Grodner,et al.  Delineation of rockburst fractures with ground penetrating radar in the Witwatersrand Basin, South Africa , 2001 .

[14]  Motoyuki Sato,et al.  Pre-stack migration applied to GPR for landmine detection , 2004 .

[15]  Du Jun.  DIELECTRIC COEFFICIENT TESTING OF GROUTING MATERIAL BEHIND SEGMENTS IN SHIELD TUNNEL , 2006 .

[16]  Yan Zhang,et al.  Profiling the Rough Surface by Migration , 2009, IEEE Geoscience and Remote Sensing Letters.

[17]  N. Economou,et al.  Deterministic deconvolution for GPR data in the t-f domain , 2011 .

[18]  Martin Schimmel,et al.  Frequency‐dependent phase coherence for noise suppression in seismic array data , 2007 .

[19]  N. Economou,et al.  Spectral balancing GPR data using time-variant bandwidth in the t-f domain , 2010 .

[20]  Frequency extrapolation to enhance the deconvolution of transmitted seismic waves , 2008 .

[21]  Song Rui-gang.  Analysis on cause of fracturing failure of tunnel lining , 2004 .

[22]  A. Benson.  Applications of ground penetrating radar in assessing some geological hazards: examples of groundwater contamination, faults, cavities , 1995 .

[23]  Huang Hong-wei.  Development and Prospect of Urban Tunnel and Underground Construction , 2001 .

[24]  N. Economou,et al.  GPR data time varying deconvolution by kurtosis maximization , 2012 .

[25]  Hai Liu,et al.  Dynamic groundwater level estimation by the velocity spectrum analysis of GPR , 2012, 2012 14th International Conference on Ground Penetrating Radar (GPR).

[26]  Mohamed A. Meguid,et al.  The effect of erosion voids on existing tunnel linings , 2009 .

[27]  Fengshou Zhang,et al.  Application of ground penetrating radar in grouting evaluation for shield tunnel construction , 2010 .

[28]  John H. Bradford,et al.  Improved GPR interpretation through resolution of lateral velocity heterogeneity: Example from an archaeological site investigation , 2009 .

[29]  Harry M. Jol,et al.  Ground penetrating radar : theory and applications , 2009 .

[30]  John H. Bradford,et al.  Instantaneous Spectral Analysis: Time-Frequency Mapping via Wavelet Matching with Application to Contaminated-Site Characterization by 3D GPR , 2007 .

[31]  B. Berard,et al.  Multi-offset ground penetrating radar data for improved imaging in areas of lateral complexity — Application at a Native American site , 2007 .

[32]  Gilles Grandjean,et al.  Frequency–wavenumber modelling and migration of 2D GPR data in moderately heterogeneous dispersive media , 1998 .

[33]  Yide Wang,et al.  Blind deconvolution via sparsity maximization applied to GPR data , 2011 .

[34]  P. J. Cain,et al.  Conclusions and Suggestions , 1980 .

[35]  N. Economou,et al.  Time-varying deconvolution of GPR data in civil engineering , 2012 .