Simulation and experimental study on space between boreholes for gas drainage instead of roadway

doi:10.16265/j.cnki.issn1003-3033.2019.05.020

Abstract

Abstract: The space between boreholes for gas drainage replacing roadway is currently determined on the basis of the experience of buried pipe drainage technology or only on the simulation of gas distribution in goaf, and its reliability is not high. Therefore, with the 2-105 working face of Tenghui mine as an experimental area, the gas concentration distribution in goaf at different hole positions and then the goaf flow field were simulated successively. On account of the gas concentration distribution and the trend of the flow track change, the influence of boreholes on gas in upper corner was analyzed so as to decide the space between boreholes. Finally, the space determined through the simulation was applied to the field test of borehole gas drainage instead of roadway in 2-105 working face, and the field data and simulation results were compared and verified. The results show that the space determined through the simulation can ensure that the gas volume fraction in upper corner is always below 0.8%, thus solving the problem of corner gas overflow on the 2-105 working face.

Key words: hole replacing roadway, large diameter drilling, goaf, gas extraction, spacing of holes

CLC Number:

X936

NIAN Jun, GAO Wei, LI Runzhi, WANG Wei. Simulation and experimental study on space between boreholes for gas drainage instead of roadway[J]. China Safety Science Journal, 2019, 29(5): 117-123.

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