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Advanced detection method for three-direction apparent polarizability of underground tunnel

A technology of advanced detection and polarizability, which is used in measurement devices, geophysical measurements, and electrical/magnetic exploration.

Pending Publication Date: 2021-03-16
ANHUI UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides an advanced detection method of apparent polarizability in three directions of the tunnel to solve the problem of insufficient spatial positioning of geological bodies in the existing advanced detection method, and aims to improve the detection of hidden geological conditions ahead of tunnel excavation. Detection resolution of bodies and their water-absorbing properties

Method used

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  • Advanced detection method for three-direction apparent polarizability of underground tunnel
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  • Advanced detection method for three-direction apparent polarizability of underground tunnel

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Embodiment

[0029] Embodiment: (numerical simulation)

[0030] The present invention simulates a fault with an infinite plate-shaped body in the whole space to solve the electric field distribution. Assuming that the resistivity of the whole space medium is ρ 0 , any power point A in this medium supplies power, and there is another one with thickness a and resistivity ρ a A uniform infinite plate-shaped body, the distance from point A to the plate-shaped body is d. The plate-shaped body divides this whole space into the active ρ 0 Medium region, infinite plate-like body ρ a Medium and passive ρ 0The three parts of the medium area, except the power point A, all satisfy the Laplace equation:

[0031] Δ 2 u 1 = 0 (active ρ 0 Medium area, except point A)

[0032] Δ 2 u 2 =0(infinite plate-shaped body ρ a medium)

[0033] Δ 2 u 3 = 0 (passive ρ 0 medium area)

[0034] Taking point A of the power supply as the origin of coordinates, Figure 4 (a), the plate-shaped body is upri...

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Abstract

The invention provides an advanced detection method for three-direction apparent polarizability of an underground tunnel, which is suitable for detecting a hidden disaster geologic body in front of the underground tunnel and the like in the construction process of the underground engineering such as the underground tunnel and the water-endowing property of the hidden disaster geologic body. The method comprises steps: firstly, designing an electrical measuring line in a tunnel, and sequentially arranging s power supply points and n measuring points on the measuring line; constructing a power supply electrode and a three-direction measuring electrode group; connecting a power supply cable and a receiving cable with an electrical prospecting apparatus, observing the potential difference between the electrode pairs P1P2, P1P3 and P1P4 at each measurement point at the moment T of power supply duration and the moment t after power failure, and calculating the apparent polarizability in three directions; obtaining a three-dimensional polarizability image of the geological body in front of tunnel excavation through inversion according to the least square method, and judging the spatial position and the water-endowing property of the hidden disaster geological body in front of tunnel excavation, and therefore technical parameters are provided for safe tunnel excavation.

Description

technical field [0001] The invention relates to the technical field of advanced detection of hidden disaster geological bodies in front of tunnel excavation and their water-absorbing property, in particular to a method for advanced detection of apparent polarizability in three directions of tunnels. Background technique [0002] The occurrence conditions of coal in my country are complex, mainly underground mining. As the mining depth continues to increase, the underground geological conditions of coal mines are becoming more and more complex, such as the existence of hidden disaster geological bodies such as faults, karst caves, and collapsed columns. The existence of these hidden disaster geological bodies can easily form water-conducting channels and cause mine water inrush accidents, which seriously affect the safe mining of coal mines. Therefore, it is of great significance to find out the geological characteristics such as the spatial location, scale and water conducti...

Claims

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Application Information

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IPC IPC(8): G01V3/08
CPCG01V3/088Y02A90/30
Inventor 胡雄武徐标孔冰清
Owner ANHUI UNIV OF SCI & TECH
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