Numerical Analysis of Stress Fields and Crack Growths in the Floor Strata of Coal Seam for Longwall Mining

Figure 2

Analytical method of additional vertical stress on the interface of coal seam and floor along the cross section A₁-A₂.

(a) Vertical stress on the interface of coal seam and floor for the disturbed case

(b) Vertical stress on the interface of coal seam and floor for the undisturbed case

(c) Additional vertical stress on the interface of coal seam and floor for the disturbed case