Researchers from University of California Ivrine and Tongji University in China developed a new measurement technique to inspect the structural integrity of man-made underground structures, which are difficult, complex and challenging to interpret. They introduced crosshole ground-penetrating radar GPR and Bayesian waveform inversion to detect defects in underground concrete structures. The research work is published in peer-reviewed journal, Automation in Construction.
The nondestructive method of GPR uses electromagnetic radiation in the microwave band (UHF/VHF frequencies) of the radio spectrum, and detects the reflected signals from subsurface structures. This method can also be used in civil engineering to detect subsurface objects, changes in material properties, voids and cracks. The method uses a transmitting and receiving antenna, the transmitting antenna emits high-frequency radio waves in the range of 10 MHz to 1 GHz which are received by the antenna in the adjacent borehole. Due to the progression in digital computing, it is possible to use wave-based models and full-waveform inversion. This approach can extract the information of the measured GPR data and will accurately simulate electromagnetic wave propagation, boundary conditions and antenna properties.
The newly developed method can now be used with assurance of detecting crack or defect in underground structures.
Hui Qin1,2,3, Xiongyao Xie1,2, Jasper A. Vrugt3,4 , Kun Zeng1,2, Gai Hong1,2. Underground structure defect detection and reconstruction using crosshole GPR and Bayesian waveform inversion, Automation in Construction 68 (2016) 156–169Show Affiliations
1 Key Laboratory of Geotechnical & Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China
2 Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China
3 Department of Civil and Environmental Engineering, University of California Irvine, CA 92697-1075, USA.
4 Department of Earth Systems Science, University of California Irvine, CA 92697-1075, USA.
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