A New Method for Predicting Coal and Gas Outbursts

<div class="floats-full-page floats-full-page-other"><h2>Table 3</h2><div class="floats-full-page-caption"><div>Failure type in the C9 coal seam, initial velocity of gas emission, and firmness coefficient.</div></div><div class="floats-full-page-content"><table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr /></td></tr><tr class="thead"><td class="align_left" rowspan="2">Coal seam</td><td class="align_center" colspan="4">Outburst parameter</td></tr><tr class="thead"><td class="align_center">Sampling site</td><td class="align_center">Failure type of coal seam</td><td class="align_center">Initial velocity of gas emission, △<i>P</i></td><td class="align_center">Protodyakonov coefficient, <i>f</i></td></tr><tr><td class="thead-hr" colspan="5"><hr /></td></tr><tr><td class="align_left" rowspan="3">C9</td><td class="align_center">Return air roadway in the 121901 working face</td><td class="align_center">V</td><td class="align_center">21</td><td class="align_center">0.19</td></tr><tr><td class="align_center">Transportation roadway in the 121901 working face</td><td class="align_center">V</td><td class="align_center">23</td><td class="align_center">0.18</td></tr><tr><td class="align_center"><svg height="8.39864pt" id="M2" style="vertical-align:-0.04981995pt" version="1.1" viewbox="-0.0498162 -8.34882 12.6264 8.39864" width="12.6264pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M412 140C382 77 369 73 315 73H129L270 222C362 320 402 379 402 466C402 571 322 635 234 635C177 635 130 609 99 576L42 495L64 475C90 514 133 568 201 568C274 568 318 519 318 435C318 349 255 267 193 193C144 135 87 78 32 23V0H405C417 45 427 89 440 131L412 140Z"></path></g><g transform="matrix(.013,0,0,-0.013,6.24,0)"><path d="M448 453H361L394 608H355L322 453H214L248 608H210L176 453H79L70 395H163L134 259H35L24 201H120L82 27H120L158 201H266L229 27H267L305 201H395L404 259H318L348 395H439L448 453ZM310 395L280 259H173L202 395H310Z"></path></g></svg> connection roadway in the 121901 working face</td><td class="align_center">V</td><td class="align_center">19</td><td class="align_center">0.19</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr" /></td></tr></table></td></tr></table></div></div>

Table 3 | A New Method for Predicting Coal and Gas Outbursts

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Table 3: A New Method for Predicting Coal and Gas Outbursts

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Table 3

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