Self-heating of coal
mine goaf or shallow coal seams can release
an outbreak of unimaginable pollution disaster under suitable circumstances.
As an indicator gas, CO
2
is always used to determine the
coal spontaneous combustion state during the self-heating process.
Based on this, the paper investigated the influence of abandoned coal
mine goaf CO
2
on the surface environment by measuring the
CO
2
concentration in the borehole connected to the goaf
and CO
2
flux on the soil surface. Furthermore, rainfall
and atmospheric temperature effects are discussed to illustrate the
correlation between the CO
2
concentration and surface soil
CO
2
flux in the closed mine goaf. Subsequently, the tracer
gas experimental method is employed to analyze the effect of air leakage
from an open-pit slope on CO
2
flux. The experimental results
demonstrated that the distribution of CO
2
concentration
in the borehole confirms the continuous diffusion of goaf CO
2
onto the surface. The value of CO
2
flux in the goaf is
significantly higher than that of a normal area. Temperature is one
of the primary factors that affect the CO
2
flux on the
field. Air leakage from the slope promotes the surface soil-overlying
goaf CO
2
diffusion. The study provides important reference
data for the assessment of the mining area field environment and the
determination of the spontaneous combustion risk of the residual coal
in the goaf.
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