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2D Cross-Hole Electrical Resistivity Tomography for small target ill geological

Views: 19     Author: Site Editor     Publish Time: 2024-09-12      Origin: Site

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Why need do 2D cross-hole electrical resistivity tomography?

Bad geology is often encountered in engineering projects, which can cause serious disasters such as sudden water inrush, landslides, and leakage, leading to construction delays, casualties, and other consequences. Effectively identifying bad geology in advance is an important prerequisite for ensuring engineering safety.

Geophysical methods like surface electrical resistivity tomography,seismic exploration,magnetotelluric(MT) or transient electromagnetic(TEM) are widely used in large-scale ill geological phenomena include faults, fracture zones, karst.

For smaller target ill geological phenomena like small caves, isolated rocks, altered rocks well-ground-well cross-hole electrical resistivity tomography is recommended,due to signal does not attenuate with depth and is not easily affected by noise


According electrode array, it can be divided into: cross-hole electrical resistivity tomography, Hole-ground electrical resistivity tomography, hole-ground-hole electrical resistivity tomography

While limited in water level,using hole-ground-hole electrical resistivity tomography with larger observation space is expected to obtain better imaging effect.

2D cross hole ERT

Electrode Array Layout out Cross-hole resistivity tomography

Core rule about cross-hole resistivity tomography :

1. Place positive electrode A in the hole and negative electrode B on the surface or in other holes.

2.The measuring electrode is located near the power supply electrodes A and B or between A and B.

ab


According to the performance of ERT instruments, multiple groups of M and N combinations can be designed to observe multi-channel data and improve acquisition efficiency.

cd


Test Result about well-ground-well cross-hole electrical resistivity tomography 

Test result

If interested methods about cross-hole electrical resistivity tomography, Hole-ground electrical resistivity tomography, hole-ground-hole electrical resistivity tomography, please feel free to contact us for more details 

3D IP


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