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

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr class="thead"><td class="align_left">Distance between measuring section and working surface (m)</td><td class="align_center">Measuring frequency</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td class="align_left">(0~1) B</td><td class="align_center">2 times/d</td></tr><tr><td class="align_left">(1~2) B</td><td class="align_center">1 time/d</td></tr><tr><td class="align_left">(2~5) B</td><td class="align_center">1 time/2~3 d</td></tr><tr><td class="align_left">&gt;5 B</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>Measurement frequency of dome subsidence and peripheral convergence displacement (according to the distance from the excavation surface).</div>

Geofluids

tab4

Table 4

Table 4: Study on Supporting Protection of Tunnel Opening near a Rock Layer under Elastic Deformation of Surrounding Rock 