Coal and Gas Comining in the High-Gas Detong Mine, China: Analytical and Numerical Parameter Optimization of Gas Extraction Boreholes

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left">Hole</td><td class="align_center">Drilling depth/m</td><td class="align_center">Drilling diameter/mm</td><td class="align_center">The horizontal distance between the final hole and roadway/m</td><td class="align_center">The vertical distance between the final hole to the roof/m</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left">1</td><td class="align_center">763</td><td class="align_center">203</td><td class="align_center">30</td><td class="align_center">30</td></tr><tr><td class="align_left">2</td><td class="align_center">782</td><td class="align_center">203</td><td class="align_center">25</td><td class="align_center">30</td></tr><tr><td class="align_left">3</td><td class="align_center">800</td><td class="align_center">203</td><td class="align_center">20</td><td class="align_center">30</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Construction parameters of roof HLBs.</div>

Advances in Civil Engineering

tab4

Table 4

Table 4: Coal and Gas Comining in the High-Gas Detong Mine, China: Analytical and Numerical Parameter Optimization of Gas Extraction Boreholes 