Failure Mechanism and Optimization of Arch-Bolt Composite Support for Underground Mining Tunnel

<table class="table-group" id="tab6"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left">Scheme no.</td><td class="align_center">Parameters of roadway</td><td class="align_center">Support type and parameters</td><td class="align_center">Vertical ground stress (MPa)</td><td class="align_center">Lateral ground stress coefficient <i>λ</i></td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left">11</td><td class="align_center" rowspan="5">The same as Schemes 1∼10</td><td class="align_center">CFST arch + Φ22 mm bolts</td><td class="align_center">10</td><td class="align_center">1.5</td></tr><tr><td class="align_left">12</td><td class="align_center">CFST arch + Φ18 mm bolts + energy-absorbing bolts on the side walls</td><td class="align_center">10</td><td class="align_center">1.5</td></tr><tr><td class="align_left">13</td><td class="align_center">CFST arch + Φ22 mm bolts + locking bolts</td><td class="align_center">10</td><td class="align_center">1.5</td></tr><tr><td class="align_left">14</td><td class="align_center">CFST arch + Φ22 mm bolts + locking bolts</td><td class="align_center">15</td><td class="align_center">1.0</td></tr><tr><td class="align_left">15</td><td class="align_center">U36 arch + Φ22 mm bolts + locking bolts</td><td class="align_center">10</td><td class="align_center">1.5</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>The numerical schemes for enhanced support.</div>

Advances in Civil Engineering

tab6

Table 6

Table 6: Failure Mechanism and Optimization of Arch-Bolt Composite Support for Underground Mining Tunnel 