A New Method for Predicting Coal and Gas Outbursts

<div class="floats-full-page floats-full-page-other"><h2>Table 8</h2><div class="floats-full-page-caption"><div>Initial critical value of gas desorption index <i>K</i><sub>1</sub> of drilling cuttings.</div></div><div class="floats-full-page-content"><table class="table-group" id="tab8"><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 samples</td><td class="align_center" rowspan="2">Sampling site</td><td class="align_center" rowspan="2">Initial critical value of gas desorption index <i>K</i><sub>1</sub> of drilling cuttings (mL/g.min<sup>1/2</sup>)</td><td class="align_center" colspan="2"><i>K</i><sub>1</sub>–<svg height="8.68572pt" id="M17" style="vertical-align:-0.0498209pt" version="1.1" viewbox="-0.0498162 -8.6359 8.15071 8.68572" width="8.15071pt" 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="M600 480C600 590 528 650 384 650H143L137 622C222 614 225 607 210 531L130 127C113 41 106 36 23 28L17 0H294L300 28C204 36 195 42 212 127L243 284L314 263C327 263 339 263 352 264C465 271 600 337 600 480ZM508 481C508 351 402 304 329 304C289 304 265 311 250 317L295 559C302 594 310 606 323 611C335 616 350 619 367 619C455 619 508 573 508 481Z"></path></g></svg> relationship <i>K</i><sub>1</sub> = <i>AP</i><sup><i>B</i></sup></td></tr><tr class="thead"><td class="align_center"><i>A</i></td><td class="align_center"><i>B</i></td></tr><tr><td class="thead-hr" colspan="5"><hr /></td></tr><tr><td class="align_left">1</td><td class="align_center">Return air roadway in the 121901 working face</td><td class="align_center">0.62</td><td class="align_center">0.7222</td><td class="align_center">0.4948</td></tr><tr><td class="align_left">2</td><td class="align_center">Transportation roadway in the 121901 working face</td><td class="align_center">0.69</td><td class="align_center">0.8038</td><td class="align_center">0.5122</td></tr><tr><td class="align_left">3</td><td class="align_center">2# connection roadway in the 121901 working face</td><td class="align_center">0.67</td><td class="align_center">0.7729</td><td class="align_center">0.4961</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr" /></td></tr></table></td></tr></table></div></div>

Table 8 | A New Method for Predicting Coal and Gas Outbursts

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Table 8: A New Method for Predicting Coal and Gas Outbursts

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Table 8

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<p><em>Shock and Vibration</em> publishes papers on all aspects of shock and vibration, especially in relation to civil, mechanical and aerospace engineering applications, as well as transport, materials and geoscience.&nbsp;</p>


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