Roof Control Technology of Mining Roadway under the Influence of Advanced Supporting Pressure

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left" rowspan="2">Mode</td><td class="align_center" colspan="3">Beam span (mm)</td></tr><tr class="thead"><td class="align_center">4000 (kN)</td><td class="align_center">3600 (kN)</td><td class="align_center">700 (kN)</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">One beam and two columns</td><td class="align_center">52.5</td><td class="align_center">58.3</td><td class="align_center">400</td></tr><tr><td class="align_left">One beam and three pillars</td><td class="align_center">373</td><td class="align_center">415</td><td class="align_center"> </td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>The carrying capacity of <i>π</i> type steel beam in different spans.</div>

Advances in Civil Engineering

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Table 4

Table 4: Roof Control Technology of Mining Roadway under the Influence of Advanced Supporting Pressure 