Control of the Chamber in Extra-Thick Coal Seam Based on Fracture Characteristics of Coal Rock and Mass

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr class="thead"><td class="align_left">Very rough</td><td class="align_center">Relatively rough</td><td class="align_center">Slightly rough</td><td class="align_center">Relatively smooth</td><td class="align_center">Smooth</td><td class="align_center">Very smooth</td></tr><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr><td class="align_left">2.00</td><td class="align_center">1.50</td><td class="align_center">1.25</td><td class="align_center">1.00</td><td class="align_center">0.75</td><td class="align_center">0.50</td></tr><tr class="table-tr"><td colspan="6"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Characterization and rating of joint microsmooth coefficients <i>J</i><sub>s</sub>.</div>

Advances in Civil Engineering

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Table 2

Table 2: Control of the Chamber in Extra-Thick Coal Seam Based on Fracture Characteristics of Coal Rock and Mass 