Deflection Laws of Gas Drainage Boreholes in Interbedded Soft and Hard Seams: A Case Study at Xinzheng Coal Mine, China

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left">Geological factors U1</td><td class="align_center">U11</td><td class="align_center">U12</td><td class="align_center">U13</td><td class="align_center">Weight</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left">U11</td><td class="align_center">1</td><td class="align_center">1/6</td><td class="align_center">1/2</td><td class="align_center">0.11</td></tr><tr><td class="align_left">U12</td><td class="align_center">6</td><td class="align_center">1</td><td class="align_center">3</td><td class="align_center">0.67</td></tr><tr><td class="align_left">U13</td><td class="align_center">2</td><td class="align_center">1/3</td><td class="align_center">1</td><td class="align_center">0.22</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Judgment matrix table U1.</div>

Advances in Civil Engineering

tab2

Table 2

Table 2: Deflection Laws of Gas Drainage Boreholes in Interbedded Soft and Hard Seams: A Case Study at Xinzheng Coal Mine, China 