Study on Pressure Relief Effect of Rock Mass with Different Borehole Parameters

Figure 19

Stress-time-AE counts of samples with different boreholes arrangement form. The arrangement forms of (a), (b), (c), (d), and (e) are vertical layout, horizontal layout, inclined layout, up three-flower layout, and down three-flower layout, respectively.

(a)

(b)

(c)

(d)

(e)