Study on the Interaction between Low-Viscosity High-Permeability Pregrouting Sealing Material and Coal and Its Application

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="8"><hr/></td></tr><tr class="thead"><td class="align_left">Coal sample source</td><td class="align_center">Borehole radius (mm)</td><td class="align_center">Original stress (MPa)</td><td class="align_center">Internal friction angle (°)</td><td class="align_center">Cohesion (MPa)</td><td class="align_center">Calculated value of <i>R</i><sub>s</sub> (mm)</td><td class="align_center">Permeation radius of <i>A</i> (mm)</td><td class="align_center">Permeation radius of <i>B</i> (mm)</td></tr><tr><td class="thead-hr" colspan="8"><hr/></td></tr><tr><td class="align_left">Wangzhuang coal mine</td><td class="align_center">21</td><td class="align_center">10</td><td class="align_center">28</td><td class="align_center">1.4</td><td class="align_center">35.6</td><td class="align_center">31.5</td><td class="align_center">35.7</td></tr><tr class="table-tr"><td colspan="8"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Comparison between the experimentally obtained permeation radii of materials and the calculated radius of plastic softening zone (<i>A</i> refers to polyurethane and <i>B</i> represents the new material).</div>

Advances in Polymer Technology

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Table 2

Table 2: Study on the Interaction between Low-Viscosity High-Permeability Pregrouting Sealing Material and Coal and Its Application 