Study on Stability Control of Retained Gob-Side Entry by Blasting Fracturing Roof Technology in Thick Immediate Roof

<table class="table-group" id="tab1"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left">Type</td><td class="align_center"><i>L</i> (mm)</td><td class="align_center"><i>L</i><sub><i>r</i></sub> (mm)</td><td class="align_center"><i>D</i> (mm)</td><td class="align_center"><i>F</i><sub><i>t</i></sub> (mm)</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left">Bolts in roof</td><td class="align_center">2500</td><td class="align_center">1200</td><td class="align_center">22</td><td class="align_center">2e5</td></tr><tr><td class="align_left">Bolts in rib</td><td class="align_center">2000</td><td class="align_center">1200</td><td class="align_center">22</td><td class="align_center">2e5</td></tr><tr><td class="align_left">Anchor cable</td><td class="align_center">8300</td><td class="align_center">2400</td><td class="align_center">17.8</td><td class="align_center">2.5e5</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr><tr class="table-fn"><td><div><i>L</i> is the length of the bolt or anchor; <i>L</i><sub>r</sub> is the grout length; <i>D</i> represents the diameters; <i>F</i><sub>t</sub> is tensile strength.<br/></div></td></tr></table>

<div>Mechanical parameters of supports.</div>

Shock and Vibration

tab1

Table 1

Table 1: Study on Stability Control of Retained Gob-Side Entry by Blasting Fracturing Roof Technology in Thick Immediate Roof 