Study on Supporting Protection of Tunnel Opening near a Rock Layer under Elastic Deformation of Surrounding Rock

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr class="thead"><td class="align_left">Displacement speed (mm/d)</td><td class="align_center">Measuring frequency</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td class="align_left">≥5</td><td class="align_center">2~3 times/d</td></tr><tr><td class="align_left">1~5</td><td class="align_center">1 time/d</td></tr><tr><td class="align_left">0.5~1.0</td><td class="align_center">1 time/2~3 d</td></tr><tr><td class="align_left">0.2~0.5</td><td class="align_center">1 time/3 d</td></tr><tr><td class="align_left">&lt;0.2</td><td class="align_center">1 time/3~7 d</td></tr><tr class="table-tr"><td colspan="2"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Measuring frequency of dome subsidence and peripheral convergence displacement (displacement according to velocity).</div>

Geofluids

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Table 3

Table 3: Study on Supporting Protection of Tunnel Opening near a Rock Layer under Elastic Deformation of Surrounding Rock 