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

Inactive Publication Date: 2010-05-12
CENT SOUTH UNIV
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Problems solved by technology

At present, the electrical prospecting used for hidden danger prediction is carried out in the roadway. Due to the influence of space constraints and electric field interference factors, it is difficult to obtain data with high signal-to-noise ratio for early warning and forecasting of hidden dangers; the BEAM method used abroad for electrical prospecting , the instruments and equipment are expensive and require special software, which are rarely imported in China and are inconvenient to promote; in addition, due to the need for power supply in

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  • Method for electrically forecasting danger in underground tunneling engineering
  • Method for electrically forecasting danger in underground tunneling engineering
  • Method for electrically forecasting danger in underground tunneling engineering

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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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Abstract

The invention discloses a method for electrically forecasting a danger in underground tunneling engineering, which comprises: building an approximately even current field in the direction of a tunnel or a laneway by burying long-distance fixed-source first and second power supply electrodes underground in the direction of the tunnel and the laneway; measuring and recording current field change under the background of the approximately even current field by using a measuring electrode buried in tunnel heading face of the laneway and a measuring electrode arranged in or outside the tunnel; and predicating and forecasting a danger around the tunnel heading face according to a law for the change of the electric field. The method has the advantages that: an electrical instrument can be placed in ground station for observation; intra-laneway power supply is avoided; the arrangement of the electrodes is convenient; and the early warning and forecasting cost is low. The method can be widely used in the field of projections involving laneway or tunnel construction, such as coal mine, mine production, communication, water conservancy and hydropower and subway projections.

Description

technical field [0001] The invention relates to an electrical method advanced forecasting method for hidden dangers used in underground excavation engineering. Background technique [0002] The potential safety hazards in front of the roadway or tunnel face, including gobs, karst, faults, gas aggregates, etc., have certain electrical differences with the surrounding rocks, and electrical prospecting has geophysical prerequisites for hazard prediction. At present, the electrical prospecting used for hidden danger prediction is carried out in the roadway. Due to the influence of space constraints and electric field interference factors, it is difficult to obtain data with high signal-to-noise ratio for early warning and forecasting of hidden dangers; the BEAM method used abroad for electrical prospecting , the instruments and equipment are expensive and require special software, which are rarely imported in China and are inconvenient to promote; in addition, due to the need fo...

Claims

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Application Information

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IPC IPC(8): G01V3/08E21F17/18
CPCY02A90/30
Inventor 朱德兵
Owner CENT SOUTH UNIV
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