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MODERN TUNNELLING TECHNOLOGY 2015, Vol. 52 Issue (4) :173-178    DOI:
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GPR Forward Simulation for Shield Tunnel Conditions Based on the Consistent Information Removal Method
(1 CCCC Second Highway Consultants Co. Ltd., Wuhan 430056; 2 CCCC Investment Company Limited, Beijing 100029; 3 Department of Geotechnical Engineering, Tongji University, Shanghai 200092; 4 CCCC Nanjing Weisan Road River-Crossing Tunnel Construction Headquarters, Nanjing 211800)
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Abstract Ground Penetrating Radar (GPR) is widely used for the detection of shield tunnel defects, but multiple reflection waves produced by lining rebars cause great difficulties for data interpretation. This paper analyzes common defects in shield tunnels and presents GPR forward simulations that were carried out using GprMax2D software based on two typical conditions: uneven backfill grouting and segment cracking. By using the consistent information removal method, the characteristics of the radar images were obtained successfully without the influence of multiple reflection waves.
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Keywords： Shield tunnel   GPR   Forward simulation   Consistent information removal method   Multiple reflection waves produced by rebars     
Abstract： Ground Penetrating Radar (GPR) is widely used for the detection of shield tunnel defects, but multiple reflection waves produced by lining rebars cause great difficulties for data interpretation. This paper analyzes common defects in shield tunnels and presents GPR forward simulations that were carried out using GprMax2D software based on two typical conditions: uneven backfill grouting and segment cracking. By using the consistent information removal method, the characteristics of the radar images were obtained successfully without the influence of multiple reflection waves.
Keywords： Shield tunnel,   GPR,   Forward simulation,   Consistent information removal method,   Multiple reflection waves produced by rebars     
Cite this article:   
.GPR Forward Simulation for Shield Tunnel Conditions Based on the Consistent Information Removal Method[J]  MODERN TUNNELLING TECHNOLOGY, 2015,V52(4): 173-178
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