Double-Tunnel TEM Layout for Concealed Orebody Positioning
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Solution Overview
Problem
The transient electromagnetic method faces challenges in accurately positioning and predicting concealed orebodies due to double-solution performance when applied in tunnel detection, as it cannot distinguish between sources above and below the tunnel.
Innovation Solution
A method utilizing parallel double-tunnel transient electromagnetic exploration, involving electrical parameter measurement, apparent resistivity calculation, and resistivity abnormity delineation, to accurately position and predict orebodies in the whole spatial domain of a tunnel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transient electromagnetic method is used for tunnel detection, then the detection capability in the whole spatial domain is improved, but the positioning accuracy deteriorates due to double-solution performance
Solution Approach 1:
The patent applies asymmetry by using two tunnels positioned at different heights (asymmetric spatial arrangement) to break the symmetry of the electromagnetic field distribution. This allows the system to distinguish between ore bodies located above and below the measurement plane, resolving the double-solution ambiguity that plagues single-tunnel detection while maintaining comprehensive spatial coverage.
Solution Approach 2:
The patent transitions from single-tunnel detection to dual-tunnel detection, adding a vertical dimension to the measurement system. By measuring electromagnetic responses from two different vertical positions, the system gains additional information that enables accurate three-dimensional localization of ore bodies, eliminating the positioning ambiguity inherent in single-plane detection.
2Measurement precision
If parallel double-tunnel transient electromagnetic exploration is used, then the positioning accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent segments the detection system into two independent but coordinated measurement systems positioned in different tunnels. Each tunnel's measurement system can operate independently, and the results are integrated to achieve high-precision three-dimensional positioning. This segmentation allows for simpler individual components while achieving complex overall functionality.
Solution Approach 2:
The patent employs universal measurement equipment that can be deployed in multiple tunnels using the same technical approach. The same transient electromagnetic detection devices and methods are applied in both tunnels, allowing for standardized equipment design and operation while achieving enhanced positioning capabilities through the multi-point measurement configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method provides accurate, portable, efficient, and cost-effective orebody positioning and prediction, overcoming multiple solution ambiguity, with successful applications in copper, lead, and zinc mining areas.
Implementation Method 1
The basic principle of a Transient Electromagnetic Method (TEM) is that the medium will produce an eddy current under the excitation of the primary current pulse field. During the interruption of the pulse, the eddy current will not disappear immediately, thereby forming a secondary magnetic field in the surrounding space that decays over time.
Implementation Method 2
the medium will produce an eddy current under the excitation of the primary current pulse field
Data Source
AI summary
Provided is a method for positioning and predicting concealed orebody based on parallel double-tunnel transient electromagnetic exploration, and belongs to the applied geophysics exploration technology. The method can locate and predict concealed orebodies with low resistivity around the tunnel in a full spatial domain based on a parallel double-tunnel transient electromagnetic method. The implementation of the method mainly includes measuring an electrical parameter, observing a tunnel transient electromagnet, calculating an apparent resistivity, determining an upper limit of an apparent resistivity abnormity, delineating the apparent resistivity abnormity and positioning and predicting concealed orebodies. The method can effectively solve the double-solution problem of positioning concealed orebodies in the full spatial domain of the tunnel.