Theoretical Study and Numerical Simulation Research on the Effect of Coal-Rock Interface on Multistaged Fracturing in the Roof of Outburst Coal Seam

Figure 4

Elasticity modulus evolution of numerical model No. 1. (a) Step 29-1. (b) Step 36-1. (c) Step 39-3. (d) Step 39-4. (e) Step 39-7. (f) Step 39-8. (g) Step 39-13. (h) Step 39-18.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)