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Dam leakage channel detection method and device based on magnetic field measurement

A technology for magnetic field measurement and channel detection, applied in the field of exploration geophysics

Inactive Publication Date: 2019-06-28
CENT SOUTH UNIV
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  • Description
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Problems solved by technology

However, so far, no one has used the magnetic field measurement method to determine the location of the embankment piping channel, and the magnetic field measurement is fast, easy to operate, and low in cost. The rapid detection of leak channels provides a means, which is worthy of further in-depth study

Method used

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  • Dam leakage channel detection method and device based on magnetic field measurement
  • Dam leakage channel detection method and device based on magnetic field measurement
  • Dam leakage channel detection method and device based on magnetic field measurement

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with examples.

[0047] The present invention obtains the gradient sensitivity of the magnetic induction intensity vector to the conductivity by inferring the formula of the magnetic anomaly vector, and the reasoning process is as follows:

[0048] The invention involves injecting a current between two electrodes (in the ground or in a borehole) and measuring the magnetic induction in three orthogonal directions.

[0049] This method involves Maxwell's equations under quasi-static conditions (that is, ignoring the time derivative in the conservation equation), the following formula:

[0050]

[0051]

[0052]

[0053] Where E is the electric field strength, B=μH, B is the magnetic induction vector (or called magnetic flux density); H is the magnetization field, μ is the permeability of free space, J c is the conduction current density.

[0054] According to equation (1), the electric field c...

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Abstract

The invention discloses a dam leakage channel detection method and device based on magnetic field measurement. The method comprises that S1) a background magnetic induction intensity vector of each magnetic observation point when power is not supplied to a signal emitter and the total magnetic induction intensity vector of each magnetic observation point when power is supplied are obtained, emitter electrodes A and B are arranged in the two sides of a dam respectively, the emitter electrode A is positioned in a reservoir and makes contact with water, the signal emitter is connected between theemitter electrodes A and B, and the magnetic observation points are arranged on the dam according to preset line pitch and dot pitch; S2) a difference between the total magnetic induction intensity vector and the background magnetic induction intensity vector of each magnetic observation point is calculated to obtain a magnetic abnormal vector of the magnetic observation point; and S3) current density distribution is deduced based on the magnetic abnormity vector of each magnetic observation point in the magnetic abnormity field, and the leakage channel is in the position where the current density distribution is not zero. The brand new method is used to realize leakage channel detection, and magnetic detection is used for the first time.

Description

technical field [0001] The invention belongs to the technical field of exploration geophysics, and in particular relates to a detection method and a device for a dam seepage channel based on magnetic field measurement. Background technique [0002] my country is a country prone to floods, and the losses caused by flood disasters are huge. Dam collapse or embankment rupture is an important cause of flood disasters, and dam leakage is the direct cause of dam collapse or embankment rupture. In the 1990s, Central South University took the lead in developing a dam piping leak detector based on the theory of flow field method, and produced stereotyped products for popularization and application, and achieved good results. The currently used embankment piping seepage instruments all establish an AC electric field between the outlet of the seepage channel and the water area in front of the embankment, and use the position where the local current density or electric field strength b...

Claims

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Application Information

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IPC IPC(8): G01N27/82
CPCG01N27/82
Inventor 汤井田胡双贵汤子键
Owner CENT SOUTH UNIV
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