Electromagnetic interference analysis of ground penetrating radar and its application in karst detection in tunnel
LI Junjie
ZHU Honglei
ZHAO Guojun
XIA Zhiqiang
GUO Jiahao
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 electromagnet-ic 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-fre-quency 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 con-struction.
Keywords：ground penetrating radarThousand Island Lake water-supply pipeline projectkarst detection
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 286-293 )