Optimization and Practice for Partition Pressure Relief of Deep Mining Roadway Using Empty-Hole and Deep-Hole Blasting to Weaken Coal

<table class="table-group" id="tab9"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left"><i>mxpres</i> (MPa)</td><td class="align_center"><i>mnpres</i> (MPa)</td><td class="align_center"><i>mxeps</i> (10<sup>-2</sup>)</td><td class="align_center"><i>mneps</i> (10<sup>-3</sup>)</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">19.20</td><td class="align_center">-1.21</td><td class="align_center">2.5</td><td class="align_center">-5.6</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr><tr class="table-fn"><td><div>Tips: <i>mxpres</i>: the maximum hydrostatic pressure is used for controlling the compression failure. <i>mnpres</i>: contrary to <i>mxpres</i>, it is used for controlling tensile failure with taking negative value. <i>mxeps</i>: the extreme value of principal strain is used for controlling compression failure. <i>mneps</i>: contrary to <i>mxeps</i>, the option is used for controlling tensile failure with as negative value.<br/></div></td></tr></table>

<div><b>MAT_ADD_EROSION</b> parameters.</div>

Geofluids

tab9

Table 9

Table 9: Optimization and Practice for Partition Pressure Relief of Deep Mining Roadway Using Empty-Hole and Deep-Hole Blasting to Weaken Coal 