Evaluation method for coal mine impact danger pressure relief effect

Abstract

The invention discloses an evaluation method for a coal mine impact danger pressure relief effect. According to the method, the inversion calculation of the wave velocity of a vibration wave can be carried out through the processing and analysis of a vibration wave signal, and the vibration wave velocity is in direct proportion to the stress level of a coal and rock mass, so that before a pressurerelief measure is carried out on the coal and rock mass, the wave velocity of an area to be subjected to pressure relief is subjected to inversion calculation, then a corresponding pressure relief measure is carried out, and then the wave velocity of the area after pressure relief is subjected to inversion calculation. The pressure relief effect can be evaluated by calculating the wave velocity change coefficient and the change range before and after pressure relief, a pressure relief effect evaluation index D is established, and pressure relief is considered to be valid when the D value is larger than 0.5; when the D value is within the range of 0.25-0.50, the pressure relief effect is weak, and pressure relief needs to be reinforced; and when the D value is smaller than 0.25, the pressure relief is invalid, and the pressure needs to be relieved again. The pressure relief effect of the whole impact dangerous area can be evaluated, no detection blind area exists, and the detection precision is high, so that the pressure relief effect of the whole impact dangerous area can be accurately evaluated.

Description

technical field [0001] The invention relates to an evaluation method for pressure relief effect of coal mine shock hazard, belonging to the technical field of coal mine safety. Background technique [0002] In recent years, with the demand of economic development, mining has developed to the deep, the geological conditions are complex, and the frequency of rock bursts is getting higher and higher. Rockburst is the sudden release of stress energy accumulated in the coal and rock mass around the roadway and stope, throwing the coal rock to the roadway, and making a strong sound at the same time, causing vibration and destruction of the coal rock mass, damage to supports and equipment, casualties, and some Roadway collapse damage and other dynamic phenomena. Rockburst can also cause or may cause other mine disasters, especially gas and coal dust explosions, fires and floods, interfere with ventilation systems, and cause ground vibrations and building damage in severe cases. I...

AI Technical Summary

Problems solved by technology

After using the above methods to relieve the pressure of the coal body, it is necessary to evaluate the pressure relief effect of the coal body. At present, it mainly relies on the drilling cuttings detection method and the online stress monitoring method. However, the above two methods are fixed-point monitoring and cannot cover the pressure relief coal body. The entire area of ​​the pressure relief area, so there is a monitoring blind area, so the effect of the entire pressure relief area cannot be accurately evaluated

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