Advanced geological prediction method for tunnel heading, and device, medium and terminal

By using differential measurement and differential analysis of electromagnetic response signals, and by using a pair of identical transceiver electromagnetic coils to eliminate interference, the problem of insufficient accuracy in electromagnetic method-based advanced geological prediction was solved, enabling efficient identification of geological hazards ahead of tunnel excavation and simultaneous detection of surrounding rock conditions.

WO2026153402A1PCT designated stage Publication Date: 2026-07-23CHANGSHA INST OF MINING RES CO LTD +1
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
CHANGSHA INST OF MINING RES CO LTD
Filing Date
2026-01-15
Publication Date
2026-07-23

AI Technical Summary

Technical Problem

Existing electromagnetic methods for advanced geological prediction struggle to accurately distinguish between normal surrounding rock responses and abnormal responses in complex environments. The reliability and resolution of the detection results are insufficient, especially in three-dimensional space where environmental interference cannot be effectively removed.

Method used

The differential measurement method is adopted, using a pair of identical transceiver electromagnetic coils to perform reverse series or parallel subtraction of signals. Combined with electromagnetic detection instruments, the mutual inductance of the transceiver coils and the background interference of the surrounding rock response are eliminated, and abnormal geology is identified through differential analysis of electromagnetic response signals.

Benefits of technology

It improves the accuracy and resolution of detection results, reduces environmental interference, and enables efficient identification of geological hazards ahead of tunnel excavation and simultaneous detection of surrounding rock conditions.

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Abstract

An advanced geological prediction method for tunnel heading. The method comprises: selecting any cross section behind a tunnel face, and arranging one measurement point at each of four orientations on a tunnel rock wall thereof; performing differential measurement between a measurement point at the center of the tunnel face and any measurement point on the tunnel rock wall, and using as a background orientation the orientation corresponding to the largest signal difference among four obtained electromagnetic response signal differences; on the basis of the measurement results, separately obtaining electromagnetic response signal differences of measurement points at the other three orientations on the tunnel rock wall and the measurement point at the center of the tunnel face with respect to a measurement point at the background orientation; and comparing the four electromagnetic response signal differences, and selecting a response signal difference having the largest absolute amplitude and the slowest amplitude decay over time, in order to interpret the orientation and distribution features of water-bearing or ore-bearing anomalous geology. In the present method, a double-differential measurement mode is used, such that interference from a primary field generated by transmitting and receiving coils can be overcome, and response background interference generated by surrounding rock itself can also be eliminated, so that obtained response signal difference data has an extremely high signal-to-noise ratio, thereby achieving higher resolution for geological hazards, etc., and thus ensuring more accurate and reliable detection results.
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