Continuity prediction of gas emission during drivage in coal seam based on stable percolation

In order to seek a convenient method to implement the dynamic and continuity prediction of gas emission during drivage in coal seam, the researches were carried out on the laws of gas flowing and emission in seam during drivage and the analytical solution were put forward about gas pressure in seam and gas emission rate from coal face in tunnel during excavating in seam, based on the approximate assumption of the coal seam. The gas emission continuity prediction model was established using the method of integration, and the calculation method of this model was introduced. The calculation of an example shows that this model can be used to predict the gas emission dynamical, continuity and quickly using the data of tunnel driving rate, driving length and basic gas parameters that can be acquired easily. The predictive value is basically identical with the measured value.