A Computing Method for Sand Inrush Quantity through a Borehole in Longde Coal Mine

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left">Parameters</td><td class="align_center">Density (kg/m<sup>3</sup>)</td><td class="align_center">Dynamic viscosity (Pa·s)</td><td class="align_center">Roughness height (mm)</td><td class="align_center">Water pressure (MPa)</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left">Value</td><td class="align_center">1652.89</td><td class="align_center">9.25</td><td class="align_center">0.1–0.4</td><td class="align_center">0.187</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Parameters of semiempirical calculation.</div>

Advances in Civil Engineering

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Table 4

Table 4: A Computing Method for Sand Inrush Quantity through a Borehole in Longde Coal Mine 