Presplit Blasting Technique in Treating Hard Overlying Strata: From Numerical Simulation to Field Practice

Figure 11

The effective stress obtained from different monitoring points with different K values. (a) K = 1.15. (b) K = 1.25. (c) K = 1.5. (d) K = 1.75.

(a)

(b)

(c)

(d)