Blasting for Fracturing and Improving the Permeability of Deep, Soft, Outburst Prone Coal Seams Using Blasthole and Relief Hole Drilled into the Underlying Stratum: Optimal Hole Distance

<table class="table-group" id="tab6"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left">Mining depth</td><td class="align_center">Single blast hole</td><td class="align_center">3 times hole spacing</td><td class="align_center">5 times hole spacing</td><td class="align_center">7 times hole spacing</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left">0 m</td><td class="align_center">1.5492</td><td class="align_center">1.5740</td><td class="align_center">1.5785</td><td class="align_center">1.5777</td></tr><tr><td class="align_left">1000 m</td><td class="align_center">1.3066</td><td class="align_center">1.5565</td><td class="align_center">1.4955</td><td class="align_center">1.4029</td></tr><tr><td class="align_left">1500 m</td><td class="align_center">1.1959</td><td class="align_center">1.3584</td><td class="align_center">1.2722</td><td class="align_center">1.2718</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>The fractal dimension of each case.</div>

Geofluids

tab6

Table 6

Table 6: Blasting for Fracturing and Improving the Permeability of Deep, Soft, Outburst Prone Coal Seams Using Blasthole and Relief Hole Drilled into the Underlying Stratum: Optimal Hole Distance 

Table 6 | Blasting for Fracturing and Improving the Permeability of Deep, Soft, Outburst Prone Coal Seams Using Blasthole and Relief Hole Drilled into the Underlying Stratum: Optimal Hole Distance 