Method for electrically forecasting danger in underground tunneling engineering
A technology of advanced forecasting and hidden dangers, applied in earth drilling, re-radiation, geophysical measurement, etc., can solve the problems of difficult instrument processing, inconvenient construction coordination, expensive instruments and equipment, etc., to achieve convenient construction coordination, early warning and forecasting The effect of low cost and simple electrode arrangement
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[0022] The present invention will be further described below with reference to the drawings and specific embodiments.
[0023] Fundamental:
[0024] In electrical exploration, when the first power supply electrode and the second power supply electrode are grounded for power supply, the electric field changes very little in the 1 / 3 or 1 / 2 section between the first power supply electrode and the second power supply electrode, which can be approximately regarded as uniform Electric field; the common approximate equiaxed geological hazards in nature, such as underground caves, goaf cavities or sac-shaped hazards, can be approximated as spheres.
[0025] Assuming that the rock mass in a homogeneous and isotropic half-space (resistivity ρ 1 In ), the underground hidden danger in front of the face 6 is a spherical structure with a dielectric resistivity of ρ 2 . When the filling medium is water or mud, ρ 2 2 , Is a low resistance abnormal body, when the filling medium is air, ρ 2 >ρ 1 , Is...
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