Determining the Layout Parameters of the Gas Drainage Roadway: A Study for Sima Coalmine China

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr class="thead"><td class="align_left">Key stratum</td><td class="align_center"><i>h</i><sub>2</sub>/<i>L</i></td><td class="align_center">1/2tan <i>ϕ</i></td></tr><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr><td class="align_left">First inferior key stratum</td><td class="align_center">0.57</td><td class="align_center">0.35</td></tr><tr><td class="align_left">Second inferior key stratum</td><td class="align_center">0.14</td><td class="align_center">0.34</td></tr><tr><td class="align_left">Main key stratum</td><td class="align_center">0.24</td><td class="align_center">0.43</td></tr><tr class="table-tr"><td colspan="3"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Advances in Civil Engineering

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Table 2

Table 2: Determining the Layout Parameters of the Gas Drainage Roadway: A Study for Sima Coalmine China 