Effect of Gob Air Leakage and Residual Methane Emission on
Mining Stope Flow Field

doi:10.11885/j.issn.1674-5086.2015.01.22.01

Abstract

Abstract:

Based on the investigation of the literatures at home and abroad，and according to the seepage mechanics，rock
mechanics，mining engineering and other multi-disciplinary cross，we establish the coal mine goaf gas flow mathematical
model with the method of combining theoretical analysis and numerical calculation. By the CFD technology，we study the
leakage distribution and gas concentration field distribution of gas concentration and velocity about wind in working face，the
scope of dissolute concentration in goaf and between goaf and working face，the relationship between goaf air leakage and air
volume in working face，the decay law of air leakage rate velocity along goaf，and determine that the highest concentration of
gas is return corner in entire working face，and the highest concentration of gas in goaf is also highest concentration of gas in
entire scope. Through the simulation of different air supply volume，we describe the migration trend of gas concentration，the
relationship between the concentration of gas and air flow rate of return corner，and also find that the gas concentration gradient
is bigger in the air side，increasing the air supply volume can decrease the concentration of gas in return corner，but increases
the risk of spontaneous combustion of remaining coal. This paper reveals the goaf air leakage and the residual coal gas emission
of the influence law of stope gas flow.

Key words: U type ventilation, goaf, air leakage, convective diffusion, numerical simulation

Pei Guihong*, Leng Jing, Liu Yuxue, Pan Jie. Effect of Gob Air Leakage and Residual Methane Emission on
Mining Stope Flow Field[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2015.01.22.01.

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