Experimental Study on Influence of Borehole Arrangement on Energy Conversion and Acoustic Characteristics of Coal-Like Material Sample

Figure 2

Sample layout of the borehole arrangement. (a) Scheme I: complete samples. (b) Scheme II: samples with boreholes. (c) Scheme III: samples with borehole with stepwise increased borehole depth. (d) Scheme IV: samples with borehole with stepwise increased borehole diameter. (e) Scheme V: samples with borehole with stepwise increased borehole depth and borehole diameter. (f) Part of the samples.

(a)

(b)

(c)

(d)

(e)

(f)