Simulation study on gas-bearing dust and its application combined with air curtain in development heading, a case study

Abstract

In view of the problems caused by the overrun of gas and dust in the tunneling process of 7703 rock roadway in Zouzhuang Coal Mine, the risk control technology research was carried out by combining numerical analysis, research and development of new automatic wall-attached duct and field test, and the dust closed control within low gas concentration was realized. The results show that the gas concentration in the local area exceeded the legal or regulation limit of 1% under the conditions of forced ventilation, axial-to-radial flow ratio 1:9 and 2:8 mixed ventilation. When the axial-to-radial flow ratios were 3:7 and 4:6, the gas concentration was low, approximately 0.5%. Additionally, when the axial-to-radial flow ratio was 4:6, the dust concentration was still maintained at approximately 150 mg/m3 until 20 m away from the head. When the axial-to-radial flow ratio was 3:7, the dust pollution was effectively controlled. At approximately 17 m from the head, the average dust concentration was gradually brought lower than 4 mg/m3.