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《Modern Tunnelling Technology》 2014-01
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Numerical Simulation of Geological Radar Detection for Unfavorable Geologic Bodies at the Tunnel Floor

Han Haodong;Ding Jianfang;Guo Rujun;China Railway Southwest Research Institute Co. Ltd.;  
Ground penetrating radar(GPR) plays an important role in detecting unfavorable geologic bodies at the bottom of tunnels. The response characteristics of various unfavorable geologic bodies reflected in radar images are the foundation of effective detection. By establishing a geoelectric model of the complex geology at a tunnel bottom, a numerical simulation was carried out by the finite difference time domain method(FDTD) and GPR images of the different geological conditions of karst, faults, and fracture zones were analyzed, providing a basis for the accurate interpretation of GPR images. The accuracy of GPR applied in detecting unfavorable geological bodies at the tunnel floor is determined using the case of a specific tunnel on a passenger-dedicated line.
【CateGory Index】: U452.11
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