The Law of Fracture Evolution of Overlying Strata and Gas Emission in Goaf under the Influence of Mining

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="9"><hr/></td></tr><tr class="thead"><td class="align_left">Area</td><td class="align_center"><span style="width: 33.2062ptpx;"><svg height="11.8174pt" id="M84" style="vertical-align:-3.1815pt" version="1.1" viewbox="-0.0498162 -8.6359 33.2062 11.8174" width="33.2062pt" 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="M686 28C612 35 607 44 591 112C563 234 541 360 519 489L489 666L457 658L147 121C100 40 89 36 24 28L17 0H240L250 28C168 34 159 41 190 101L262 237H482C495 180 503 137 510 91C517 47 514 35 441 28L433 0H677L686 28ZM475 280H285L429 541H431L475 280Z"></path></g><g transform="matrix(.0091,0,0,-0.0091,10.244,3.132)"><path d="M389 0V32C297 38 291 46 291 118V635C234 613 175 595 109 583V556L161 554C203 552 207 547 207 497V118C207 46 201 38 110 32V0H389Z"></path></g><g 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class="align_center">1.2</td><td class="align_center">1.14</td><td class="align_center">1.05</td><td class="align_center">1.12</td><td class="align_center">1.07</td><td class="align_center">1.05</td><td class="align_center">1.07</td><td class="align_center">1.06</td></tr><tr><td class="align_left">Porosity</td><td class="align_center">0.17</td><td class="align_center">0.12</td><td class="align_center">0.05</td><td class="align_center">0.11</td><td class="align_center">0.07</td><td class="align_center">0.05</td><td class="align_center">0.07</td><td class="align_center">0.06</td></tr><tr><td class="align_left">Permeability (10<sup>-6</sup>/m<sup>2</sup>)</td><td class="align_center">1.45</td><td class="align_center">1.2</td><td class="align_center">0.03</td><td class="align_center">1.2</td><td class="align_center">0.14</td><td class="align_center">0.14</td><td class="align_center">0.007</td><td class="align_center">0.3</td></tr><tr class="table-tr"><td colspan="9"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Coefficient of dilatation of rock collapse of each area.</div>

Geofluids

tab2

Table 2

Table 2: The Law of Fracture Evolution of Overlying Strata and Gas Emission in Goaf under the Influence of Mining 