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="tab1"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left">Borehole deflection <i>Z</i></td><td class="align_center"><i>U</i><sub>1</sub></td><td class="align_center"><i>U</i><sub>2</sub></td><td class="align_center"><i>U</i><sub>3</sub></td><td class="align_center">Weight</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left"><i>U</i><sub>1</sub></td><td class="align_center">1</td><td class="align_center">2</td><td class="align_center">5</td><td class="align_center">0.606</td></tr><tr><td class="align_left"><i>U</i><sub>2</sub></td><td class="align_center">1/2</td><td class="align_center">1</td><td class="align_center">2</td><td class="align_center">0.265</td></tr><tr><td class="align_left"><i>U</i><sub>3</sub></td><td class="align_center">1/5</td><td class="align_center">1/2</td><td class="align_center">1</td><td class="align_center">0.129</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Judgment matrix table <i>Z</i>.</div>

Advances in Civil Engineering

tab1

Table 1

Table 1: Deflection Laws of Gas Drainage Boreholes in Interbedded Soft and Hard Seams: A Case Study at Xinzheng Coal Mine, China 