Numerical Simulation of Parameters Optimization for Goaf Gas Boreholes

Table 3

Gas extraction effect under different vertical height and horizontal distance.

Location	Average pure quantity of gas extraction (m^3/min)	Average mixture quantity of gas extraction (m^3/min)	Average concentration of gas extraction (%)
(45 m, 10 m)	5.22	19.6	26.63
(45 m, 16 m)	9.78	22.2	43.95
(45 m, 22 m)	4.79	23.3	20.56
(35 m, 16 m)	4.54	26.4	9.71
(55 m, 16 m)	4.32	18.1	23.87