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

Figure 3

Additional vertical stress on the interface of coal seam and floor along different cross sections.

(a) Additional vertical stress on the interface of coal seam and floor along the cross section A₁-A₂

(b) Additional vertical stress on the interface of coal seam and floor along the cross section B₁-B₂

(c) Additional vertical stress on the interface of coal seam and floor along the cross section C₁-C₂