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

<table class="table-group" id="tab2"><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">Unstressed influence section</td><td class="align_center">Advance stress influence section</td><td class="align_center">Superimposed stress influence section</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">Roof stress in maximum failure plane (MPa)</td><td class="align_center">10</td><td class="align_center">11</td><td class="align_center">18</td></tr><tr><td class="align_left">Peak stress of roadway roof (MPa)</td><td class="align_center">10</td><td class="align_center">13</td><td class="align_center">18</td></tr><tr><td class="align_left">Peak position (m)</td><td class="align_center">−17.5</td><td class="align_center">0</td><td class="align_center">−17.5</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Three stages of stress change during advance.</div>

Advances in Civil Engineering

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Table 2

Table 2: Research on Failure Mechanism and Strengthening of Broken Roadway Affected by Upper Coal Pillar 