Research on gas extraction radius of 18# coal seam in Taiping Coal Mine through along layer drilling based on extraction quantity method

Taking the Taiping Coal Mine +700 m level South No.1 mining area as the investigation area, combining with the newly issued standard 《direct measurement method for coal seam gas extraction radius in coal mines-extraction volume method (GB/T 42638-2023)》, a field investigation was conducted on the gas extraction radius of the No.18 coal seam through the parallel drilling using the extraction method. The results showed that under the drilling diameter of ϕ 94 mm and normal pumping conditions (pumping negative pressure, pumping concentration), the pumping times corresponding to extraction radius of R₁=1 m, R₂=1.5 m, and R₃=2 m are t₁=30 d, t₂=60 d, and t₃=80 d, the correlation is: R=0.964Ln(t)−2.319. The investigation results can effectively guide the gas extraction work of coal seam 18# and ensure the safety production of the mine.