Method for electrically forecasting danger in underground tunneling engineering

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...

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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 the roadway, in the production of coal mines and other mines, considering the safety standard factors, the safety standard design of the instrument, the control of the power supply current, It is very difficult to deal with components such as power supply electrodes, which is another reason why electrical prospecting is difficult to popularize and apply; in addition, the advanced forecasting work of electrical instruments requires technicians to bring the instruments into the well for each test. Long, construction coordination is inconvenient

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