Study on Pressure Relief Effect and Rock Failure Characteristics with Different Borehole Diameters

Figure 10

Schematic diagram of failure mode analysis and monitoring: (a) +0.1UCS; (b) +0.3UCS; (c) +0.5UCS; (d) +0.7UCS; (e) +0.9UCS; (f) UCS; (g) −0.9UCS; (h) −0.7UCS.