Gas-liquid-solid three-phase coupling blasting weakening rock burst and permeability increasing method

Abstract

Provided is a gas-liquid-solid three-phase coupling blasting weakening rock burst and permeability increasing method. By coal seam water injection and changing of a powder charge structure of traditional blasting, common gas-solid two-phase blasting is converted into gas-liquid-solid three-phase blasting. Blast wave in water, jet flow, secondary pressure wave and other effects are generated by water pressure blasting to enhance blasting effect, after drilled holes are formed, coal bodies are wetted through water injection firstly, physical and mechanical properties around the drilled holes are changed, the gas-solid two-phase coal bodies are converted into gas-liquid-solid three-phase media, a stress concentrating zone is pushed to the deep parts of the coal bodies, stress concentration is lowered; coal seam fractures around blasting holes and in an influence zone are stretched and developed, the fractures are communicated with each other, a facture network is formed, stress concentration is removed, channels are provided for coal seam pressure relief gas flow, and accordingly the purpose that rock burst and gas outburst are prevented is achieved.

Description

technical field [0001] The invention relates to a gas-liquid-solid three-phase coupling blasting method for weakening rock burst and increasing permeability, and is especially suitable for regional pressure relief and increasing permeability in drilling holes under high-stress, high-gas and low-permeability outburst coal seams. Background technique [0002] Rock burst is one of the most serious disasters in the process of coal mining. Especially with the increase of coal mining depth, the ground stress and gas pressure increase significantly, which can easily cause coal and gas outburst accidents, which brings great harm to the safety of coal mine production. Great threat. Rockburst disasters have become an important factor restricting efficient and intensive mining and safe production in coal mines. At present, the commonly used pressure relief and permeability enhancement measures mainly include deep hole controlled blasting, hydraulic slotting, hydraulic fracturing, and ...

AI Technical Summary

Problems solved by technology

At present, the commonly used pressure relief and permeability enhancement measures mainly include deep hole controlled blasting, hydraulic slotting, hydraulic fracturing, and coal seam water injection. Concentration increases the risk of outbursts, and often has problems such as exceeding the standard of effective inspection and slow recovery speed. Traditional technical means can no longer meet the requirements of complex dynamic disasters under the coupling of double disasters of rock burst and gas outburst.

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