Abstract
To determine the layout parameters of the gas drainage roadway (GDR) serving for the working face, an analytical calculation method of fracture zone and the modelling experiment were adopted, and the overburden fissure induced by mining and the height of fracture zone were analyzed. For the research on the distribution of fracture zone by analytical calculation method, the multiple factors influencing the failure mode of strata and the height of fracture zone were considered. The #1207 working face in Sima mine was taken as an engineering background, and the layout parameters of GDR were given by analyzing the height of fracture zone. Combining the results obtained by analytical calculation and scale modelling experiment, the suggested height of GDR was 10.7–32.8 m away from the coal seam roof, and the projection distance of GDR in the horizontal was within the range of 0–35 m from the airway. By monitoring the gas drainage effects in different heights away from coal seam roof in #1207 working face and in different horizontal distances away from the ventilation roadway in the #1211 working face, the results showed that the optimal height was 17.5–22 m away from coal roof, and the optimal horizontal distance was 17–21 m away from airway for GDR. The gas drainage effect of GDR indicated that the proposed parameters are scientific and reasonable.
Highlights
Scale Modelling ExperimentIn order to verify the rationality of the above theory analysis and study the layout parameters of the gas drainage roadway (GDR) in the working face, we take the #1207 working face of Sima mine as the prototype to carry out scale modelling experiment
To determine the layout parameters of the gas drainage roadway (GDR) serving for the working face, an analytical calculation method of fracture zone and the modelling experiment were adopted, and the overburden fissure induced by mining and the height of fracture zone were analyzed
By monitoring the gas drainage effects in different heights away from coal seam roof in #1207 working face and in different horizontal distances away from the ventilation roadway in the #1211 working face, the results showed that the optimal height was 17.5–22 m away from coal roof, and the optimal horizontal distance was 17–21 m away from airway for GDR. e gas drainage effect of GDR indicated that the proposed parameters are scientific and reasonable
Summary
In order to verify the rationality of the above theory analysis and study the layout parameters of the GDR in the working face, we take the #1207 working face of Sima mine as the prototype to carry out scale modelling experiment. E fracture angles in the mining side and in the open-off cut side are analyzed when the working face is advanced to 60 cm, 90 cm, 120 cm, 150 cm, and 180 cm, respectively. E maximum and minimum values of fracture angle in the open-off cut side are 67° and 65°, respectively. Us, it is estimated that fracture angle in the mining side is about 62° and the fracture angle in the cut-off side is about 66° for the #1207 working face of Sima mine based on the scale modelling experiment. E curve subsidence zone is located over 54.9 m above the coal seam
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