The Study on Large-Diameter Drilling Prevention Method of Rock Burst in the Xinxing Coal

Figure 15

Distribution of plastic zone under different apertures.

(a) No boreholes

(b) Borehole diameter 200 mm

(c) Borehole diameter 400 mm

(d) Borehole diameter 600 mm

(e) Borehole diameter 800 mm

(f) Borehole diameter 1000 mm