Rockburst in Sandstone Containing Elliptic Holes with Varying Axial Ratios

Figure 6

Photographs showing deformation during the rockburst process for sample S-1.25-1. (a) σ_v = 13.60 MPa; σ_h = 10.2 MPa. (b) σ_v = 48.78 MPa; σ_h = 10.2 MPa. (c) σ_v = 49.25 MPa; σ_h = 10.2 MPa. (d) σ_v = 49.34 MPa; σ_h = 10.2 MPa. (e) σ_v = 49.48 MPa; σ_h = 10.2 MPa. (f) σ_v = 49.52 MPa; σ_h = 10.2 MPa. (g) σ_v = 49.80 MPa; σ_h = 10.2 MPa. (h) σ_v = 49.93 MPa; σ_h = 10.2 MPa. (i) σ_v = 50.11 MPa; σ_h = 10.2 MPa. (j) σ_v = 50.38 MPa; σ_h = 10.2 MPa. (k) σ_v = 51.52 MPa; σ_h = 10.2 MPa. (l) σ_v = 51.76 MPa; σ_h = 10.2 MPa. (m) σ_v = 52.40 MPa; σ_h = 10.2 MPa. (n) σ_v = 53.07 MPa; σ_h = 10.2 MPa. (o) σ_v = 52.97 MPa; σ_h = 10.2 MPa. (p) σ_v = 51.98 MPa; σ_h = 10.2 MPa. (q) σ_v = 50.62 MPa; σ_h = 10.2 MPa. (r) σ_v = 50.25 MPa; σ_h = 10.2 MPa. (s) σ_v = 49.67 MPa; σ_h = 10.2 MPa. (t) σ_v = 48.01 MPa; σ_h = 10.2 MPa. (u) σ_v = 48.01 MPa; σ_h = 10.2 MPa.

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