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

<table class="table-group" id="tab6"><tr><td><table class="table"><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr class="thead"><td class="align_left">Country</td><td class="align_center">Max roughness of technical standard (mm)</td><td class="align_center">Technical standard</td></tr><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr><td class="align_left">China</td><td class="align_center">0.4</td><td class="align_center">GB1031-83</td></tr><tr><td class="align_left">USA</td><td class="align_center">0.1</td><td class="align_center">BS1134-61/ASAB46.1-62</td></tr><tr><td class="align_left">Switzerland</td><td class="align_center">0.2</td><td class="align_center">VSM10321-62</td></tr><tr><td class="align_left">Italy</td><td class="align_center">0.1</td><td class="align_center">UNI13963-60</td></tr><tr><td class="align_left">Japan</td><td class="align_center">0.4</td><td class="align_center">JISB0601-70</td></tr><tr><td class="align_left">Poland</td><td class="align_center">0. 32</td><td class="align_center">PN58/M042-51</td></tr><tr class="table-tr"><td colspan="3"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Max roughness of technical standard in part country.</div>

Advances in Civil Engineering

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Table 6

Table 6: A Computing Method for Sand Inrush Quantity through a Borehole in Longde Coal Mine 