Advanced detection response and application of transient electromagnetic field of shallow buried deep coil
To effectively identify adverse geological conditions such as goaf,karst,and water-conducting fracture zones ahead of the tunnel face and prevent water inflow accidents during tunnel excavation,the application of shallow buried deep coil transient electromagnetic theory in tunnel advanced detection was investigated.A shallow buried deep coil advanced detection model was proposed by COMSOL software to investigate the propagation characteristics and abnormal response features of electromagnetic fields in different directions ahead of the tunnel face.The tunnel project between Jialingjiang Road Station and Xiangjiang Road Station Qingdao Metro Line 13 was used to validate the proposed model's performance in identifying abnormal responses.The results showed that the proposed model can effectively identify low-resistivity anomalies at different positions ahead of the tunnel surface.Moreover,the effect of anomalies in different azimuths on the electric field response was mainly presented in the response intensity.Transient electromagnetic field can effectively distinguish the air zone and rock zone,and the electromagnetic field attenuated faster in the high-resistance surrounding rock near the surface due to the influence of the air zone,resulting in high-resistance anomalies of the practical detection during inversion analysis.
shallow buried deep coiltransient electromagneticadvanced detectionworking facelow resistance anomalous bodytunnel construction
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