Research on Failure Mechanism and Strengthening of Broken Roadway Affected by Upper Coal Pillar

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left"> </td><td class="align_center">Influence of boundary pillar</td><td class="align_center">Influence of the 051604 working face</td><td class="align_center">Influence of the 051606 working face</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">Influence value of each stage (MPa)</td><td class="align_center">4.4</td><td class="align_center">5.6</td><td class="align_center">8</td></tr><tr><td class="align_left">Total impact value (MPa)</td><td class="align_center">4.4</td><td class="align_center">10</td><td class="align_center">18</td></tr><tr><td class="align_left">Influence degree</td><td class="align_center">Strong</td><td class="align_center">Stronger</td><td class="align_center">Extremely strong</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Analysis of principal stress difference on the rock surrounding the roof during failure.</div>

Advances in Civil Engineering

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Table 3

Table 3: Research on Failure Mechanism and Strengthening of Broken Roadway Affected by Upper Coal Pillar 