Application of high density resistivity method and transient electromagnetic method for Advanced Prediction in Tunnel
During the tunnel construction in the Datai section,there were many falling blocks and settlements of local sec-tions.In order to find out the geological conditions of the upper part of the excavation fracture zone,the ground geophysical ex-ploration technology was used for detection.The combination of the high-density resistivity method and transient electromagnet-ic method shows that the high-density resistivity method has the advantages of fast and high efficiency and can better reflect the poor geological bodies in the shallow part.The Transient electromagnetic method has the advantages of flexibility and large de-tection depth,and it has specific effect on detecting medium and deep unfavorable geological bodies.The combined geophysical prospecting technology has proved the geological changes above the tunnel range from shallow to deep,explained the causes of the tunnel block falling and local settlement,and provided guiding opinions for the following construction treatment.
advance forecasttunnel constructiontransient electromagnetic methodhigh density resistivity method
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