Influences of Water Vapor on Roof Fall Accidents in Selected Underground Coal Mines in Malawi

<table class="table-group" id="tab1"><tr><td><table class="table"><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr class="thead"><td class="align_left"> </td><td class="align_center"><i>A</i><sub>d</sub> (kg/m<sup>3</sup>)</td><td class="align_center"><i>B</i><sub>d</sub> (kg/m<sup>3</sup>)</td></tr><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr><td class="align_left">Mchenga arkose sandstone</td><td class="align_center">2465</td><td class="align_center">46</td></tr><tr><td class="align_left">Mchenga fine-grained sandstone</td><td class="align_center">2013</td><td class="align_center">67</td></tr><tr><td class="align_left">Kimachi sandstone</td><td class="align_center">2011</td><td class="align_center">131</td></tr><tr class="table-tr"><td colspan="3"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Coefficients to represent density as a function of relative humidity.</div>

Advances in Civil Engineering

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Table 1

Table 1: Influences of Water Vapor on Roof Fall Accidents in Selected Underground Coal Mines in Malawi 