A Multiscale Structural Analysis of Soft and Hard Coal Deposits in Deep High-Gas Coal Seams

<div>Mesostructures of the hard coal in the different coal seams. (a) No. 1 hard coal in the No. 4 coal seam. (b) No. 2 hard coal in No. 4 coal seam. (c) No. 1 hard coal in the No. 13 coal seam. (d) No. 2 hard coal in the No. 13 coal seam.</div>

Advances in Civil Engineering

fig4

Figure 4

Figure 4: A Multiscale Structural Analysis of Soft and Hard Coal Deposits in Deep High-Gas Coal Seams 