Fig. 6
From: Stress distribution characteristics of overburden strata during thick coal seam top coal caving
Characteristics of overburden strata force chain evolution after top coal caving of a thick coal seam. (a) Time step of 1 × 103; (b) time step of 5 × 103; (c) time step of 2.5 × 104; and (d) time step of 5 × 104.
