Methane explosion
is an undesired incident in the coal
mining industry.
Its high pressure wave can cause damage to the rock mass. This study
numerically investigated the flame and wave transport characteristics
of methane explosion with ignition sources at three different locations,
and the corresponding dynamic response of the rock masses was discussed.
The results showed that the flame propagation time is shortest when
the ignition position is located at the center of the H-type roadway
structure and the maximum overpressure decreases as the ignition position
deviates from the center of the H-type roadway structure. When the
ignition point is located at the center of the H-type roadway structure,
the smallest total deformation of rock mass shows up with the highest
maximum overpressure. In contrast, the largest total deformation appears
when the ignition point is most away from the center due to the asymmetric
distribution of the gas pressure exerted on both sidewalls of the
rock masses. This work may provide insights into the understanding
of deflagration propagation and the dynamic evolution of stresses
under complex conditions.