Mechanism of Support Optimization and Confined Blasting of Thick and Hard Rock with a Wedge-Structure Immediate Roof: A Case Study

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr class="thead"><td class="align_left">Name</td><td class="align_center">Confined of filled water</td><td class="align_center">Coefficient of explosive amount</td><td class="align_center">Explosive charge</td><td class="align_center">Horizontal angle of blasting drilling</td><td class="align_center">Charge hole distance</td><td class="align_center">Diameter of large pore guidance hole</td></tr><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr><td class="align_left">Parameter</td><td class="align_center">2.0 MPa</td><td class="align_center">0.3</td><td class="align_center">32 kg</td><td class="align_center">15°, 20°</td><td class="align_center">7.0 m</td><td class="align_center">100 mm</td></tr><tr class="table-tr"><td colspan="7"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>The basic parameters of the confined blasting in water-filled deep hole presplit technology.</div>

Geofluids

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Table 3

Table 3: Mechanism of Support Optimization and Confined Blasting of Thick and Hard Rock with a Wedge-Structure Immediate Roof: A Case Study 