Fig 1.
Dynamic disturbance mechanical model of periodic roof fracture.
Table 1.
Mechanical parameters of materials used in the model.
Fig 2.
Initial numerical model.
Fig 3.
Vertical stress distribution contour of the surrounding rock in the mining face.
Fig 4.
Distribution characteristics of the abutment pressure ahead of the working face.
Fig 5.
Vertical displacement of the roof during working face advancement.
Fig 6.
Crack propagation direction in coal under stress.
Table 2.
Seepage parameters.
Fig 7.
Numerical simulation of gas pressure at the instant of roof fracture (50m).
Table 3.
Gas desorption from the coal body at the moment of roof fracture.
Fig 8.
Gas pressure distribution before and after periodic roof weighting.
Fig 9.
Variation of gas pressure under different mining distances.