Pressure-Relief Mechanism and Application of Large-Diameter Boreholes in Coal Seams with Rockburst Hazard

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr><td class="align_left">Borehole depth/m</td><td class="align_center">4~7</td><td class="align_center">7~10</td><td class="align_center">10~13</td><td class="align_center">13~16</td><td class="align_center">16~20</td></tr><tr><td class="align_left">Critical mass/kg</td><td class="align_center">8</td><td class="align_center">11</td><td class="align_center">17</td><td class="align_center">23</td><td class="align_center">29</td></tr><tr class="table-tr"><td colspan="6"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>The critical mass of drill-cuttings to be monitored.</div>

Geofluids

tab2

Table 2

Table 2: Pressure-Relief Mechanism and Application of Large-Diameter Boreholes in Coal Seams with Rockburst Hazard 