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Volume 37 Issue 2
Apr.  2018
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Article Navigation >  CARSOLOGICA SINICA  > 2018  >  37(2): 286-293
LI Junjie, ZHU Honglei, ZHAO Guojun, XIA Zhiqiang, GUO Jiahao. Electromagnetic interference analysis of ground penetrating radar and its application in karst detection in tunnel[J]. CARSOLOGICA SINICA, 2018, 37(2): 286-293. doi: 10.11932/karst20180216
Citation: LI Junjie, ZHU Honglei, ZHAO Guojun, XIA Zhiqiang, GUO Jiahao. Electromagnetic interference analysis of ground penetrating radar and its application in karst detection in tunnel[J]. CARSOLOGICA SINICA, 2018, 37(2): 286-293. doi: 10.11932/karst20180216
shu

Electromagnetic interference analysis of ground penetrating radar and its application in karst detection in tunnel

doi: 10.11932/karst20180216

  • Zhejiang Design Institute of Water Conservancy and Hydro-electric Power

  • Publish Date: 2018-04-25
    Abstract
  • The Ground Penetrating Radar (GPR) was applied to detect karst caves in a tunnel in Thousand Island Lake water-supply pipeline project. The difference of radar anomalies between inclined electromagnetic interference and karst cave was analyzed. Then the properties and spatial distribution characteristics of the tunnel bottom of the karst cave were deduced by analyzing radar profiles and single-channel time-frequency spectrum of the suspected abnormal area. The water-filled karst caves were characterized by the phase axis fault,strong amplitude and high energy attenuation in the radar reflected profiles. The amplitude of high-frequency interference is smaller than abnormal area and the energy does not appear in accordance with the law that it should decay over time. The results of radar provide an accurate reference for the safety of tunnel construction.

     

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