Wang 5 studied the technology of unloading pressure relief to increase the penetration of high-gas and low-permeability coal seams, and the results showed that with the increase in unloading pressure relief time, the vertical stress at the peripheral points of a single large-diameter borehole showed a trend of increasing first and then decreasing.
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Study on Numerical Simulation of Large-Diameter Borehole Pressure Relief in Deep High-Gas Soft Coal Seams.
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