Study of Two-Step Parallel Cutting Technology for Deep-Hole Blasting in Shaft Excavation

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr class="thead"><td class="align_left">Size</td><td class="align_center">Quality/(g/volume)</td><td class="align_center">Density/(g/cm<sup>3</sup>)</td><td class="align_center">Gap distance/cm</td><td class="align_center">Violence/mm</td><td class="align_center">Detonation velocity (m/s)</td></tr><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr><td class="align_left"><i>φ</i>45 mm × 420 mm</td><td class="align_center">800</td><td class="align_center">1.0∼1.25</td><td class="align_center">0.445</td><td class="align_center">0.3</td><td class="align_center">3010</td></tr><tr class="table-tr"><td colspan="6"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Parameters of No. 2 rock emulsion explosive.</div>

Shock and Vibration

tab4

Table 4

Table 4: Study of Two-Step Parallel Cutting Technology for Deep-Hole Blasting in Shaft Excavation 