Research and Analysis on the Influence of Small Clear Distance Drilling and Blasting Method on the Existing Tunnel Structure

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left" rowspan="2">Monitoring location</td><td class="align_center" colspan="3">Vibration (cm/s)</td></tr><tr class="thead"><td class="align_center"><i>X</i> direction</td><td class="align_center"><i>Y</i> direction</td><td class="align_center"><i>Z</i> direction</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">Vault (ZK1 + 252)</td><td class="align_center">8.17</td><td class="align_center">4.73</td><td class="align_center">6.85</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Maximum vibration velocity component of monitoring points at tunnel vault.</div>

Advances in Civil Engineering

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Table 4

Table 4: Research and Analysis on the Influence of Small Clear Distance Drilling and Blasting Method on the Existing Tunnel Structure 