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A Tunnel Advanced Geological Detection Method Based on Time-Delayed Transient Electromagnetic

A geological detection and transient electromagnetic technology, applied in the field of engineering investigation, can solve problems such as blind spots in forecasting, hidden safety hazards in tunnel construction, and difficulty in forecasting, etc., and achieve the effects of long forecasting range, elimination of interference, and high work efficiency.

Active Publication Date: 2019-03-05
CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a tunnel advanced geological detection method based on time-delayed transient electromagnetics to solve the difficulties in forecasting near the tunnel face, the existence of forecast blind spots, and the tunnel construction problems that exist when the existing transient electromagnetics are used for tunnel geological advanced prediction. Safety hazards cannot be detected early

Method used

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  • A Tunnel Advanced Geological Detection Method Based on Time-Delayed Transient Electromagnetic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] When it is necessary to carry out advanced geological exploration at 4 places on the face of the tunnel, set a circle of transmitting coil 1 in the tunnel. The transmitting coil 1 is made of multiple copper core external insulated soft wires with a diameter of 5mm and an internal resistance of less than 10Ω. The transmitting coil 1 is evenly distributed. Attached to the cave wall 5 and the cave bottom 6, the distance between the transmitting coil 1 and the tunnel face 4 at the end of the tunnel is the delay distance d, and the delay distance d is 20m; Each receiving point 3 is marked and numbered. The receiving point 3 is divided into several lines from bottom to top, and each line is divided into several points from left to right. The point distance of receiving point 3 is 2m; fix the receiving probe 2 at the end of a test rod, the receiving probe 2 is a coil type rod-shaped magnetic probe with a receiving frequency of 10kHz and an accuracy of 1μv / nT.Hz, and then fix th...

Embodiment 2

[0040]When it is necessary to carry out advanced geological exploration at 4 places on the face of the tunnel, set a circle of transmitting coil 1 in the tunnel. The transmitting coil 1 is made of multiple copper core external insulated soft wires with a diameter of 5mm and an internal resistance of less than 10Ω. The transmitting coil 1 is evenly distributed. Attached to the cave wall 5 and the cave bottom 6, the distance between the transmitting coil 1 and the tunnel face 4 at the end of the tunnel is the delay distance d, and the delay distance d is 10m; Each receiving point 3 is marked and numbered. The receiving point 3 is divided into several lines from bottom to top, and each line is divided into several points from left to right. The point distance of receiving point 3 is 1m; fix the receiving probe 2 at the end of a test rod, the receiving probe 2 is a coil-shaped rod-shaped magnetic probe with a receiving frequency of 10kHz and an accuracy of 1μv / nT.Hz, and then fix t...

Embodiment 3

[0042] When it is necessary to carry out advanced geological exploration at 4 places on the face of the tunnel, set a circle of transmitting coil 1 in the tunnel. The transmitting coil 1 is made of multiple copper core external insulated soft wires with a diameter of 5mm and an internal resistance of less than 10Ω. The transmitting coil 1 is evenly distributed. Attached to the cave wall 5 and the cave bottom 6, the distance between the transmitting coil 1 and the tunnel face 4 at the end of the tunnel is the delay distance d, and the delay distance d is 15m; Each receiving point 3 is marked and numbered. The receiving point 3 is divided into several lines from bottom to top, and each line is divided into several points from left to right. The point distance of receiving point 3 is 1.2m; Fix the receiving probe 2 at the end of a test rod, the receiving probe 2 is a coil-shaped rod-shaped magnetic probe with a receiving frequency of 10kHz and an accuracy of 1μv / nT.Hz, and then fi...

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Abstract

The invention discloses a tunnel advanced geological detection method based on delayed transient electromagnetism. According to the method, a smooth filtering method and a band-pass filtering method are adopted to filter out high-frequency, low-frequency and power-frequency interference, multi-detection-way sensing data of each detection point in multiple directions are enabled to be relatively smooth, and preliminary sensing signals between an emitting coil and a working face are amputated to eliminate interference of a preliminary-stage field, in other words, prediction dead zones are eliminated while potential safety hazards in tunnel construction can be found at an early date. The tunnel advanced geological detection method can be used for advanced geological prediction of tunnel construction and has the advantages of high working efficiency, wide prediction range and good water-mud burst prediction effect, and the prediction problem of dead zones close to the working face is solved effectively.

Description

technical field [0001] The invention relates to the technical field of engineering survey, in particular to an advanced geological detection method for tunnels based on time-delayed transient electromagnetics. Background technique [0002] Transient electromagnetic method, also known as time-domain electromagnetic method, is to use ungrounded return line or grounding line source to transmit a pulsed magnetic field underground, and use coils or grounding electrodes to observe the secondary induced eddy current field caused in the underground medium during the intermittent period of the pulsed magnetic field. , so as to detect a method of medium resistivity. The early electromagnetic field is equivalent to the high-frequency component in the frequency domain, with fast attenuation and small skin depth; while the late component is equivalent to the low-frequency component in the frequency domain, with slow attenuation and large skin depth. The geoelectric characteristics at di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/10
CPCG01V3/10Y02A90/30
Inventor 王波
Owner CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD