This is due to the accumulation of methane flowing from the goaves with caving and the working area of the longwall, resulting from methane emissions from the coal mined and the body of coal [1-6].
Methane concentration and its distribution in this zone depend on the amount of methane flowing out of the longwall and the goaves with caving, the amount of the fresh air supplied to the longwall, and the geometry of the tailgate.
A change in heading geometry leads to differences in aerodynamic potentials in the area of exploitation, which--in turn --impact the volume of methane emitted from the goaves with caving into the working area of the longwall.
The parameters describing the goaves with caving were also determined on the basis of tests in real world conditions.
In order to achieve this objective, a geometric model was developed for the longwall and the longwall headings as well as for the goaves with caving (Fig.