Experimental Study of Influence of Support Failures on Rockbursts under True-Triaxial Condition

<table class="table-group" id="tab5"><tr><td><table class="table"><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr class="thead"><td class="align_left">Specimen number</td><td class="align_center"><i>σ</i><sub>max</sub> (MPa)</td><td class="align_center">Dimension of rockburst notch (cm × cm × cm)</td><td class="align_center">Quality of ejected fragments (g)</td><td class="align_center">Average rate of ejected fragments (m/s)</td><td class="align_center">Kinetic energy of ejected fragments (J)</td><td class="align_center">Average size of ejected fragments (mm)</td></tr><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr><td class="align_left">GZ-4</td><td class="align_center">183</td><td class="align_center">15.8 × 10.0 × 1.7</td><td class="align_center">70.13</td><td class="align_center">3.33</td><td class="align_center">0.39</td><td class="align_center">38.65</td></tr><tr><td class="align_left">GZ-5</td><td class="align_center">205</td><td class="align_center">17.5 × 10.0 × 1.6</td><td class="align_center">272.44</td><td class="align_center">3.24</td><td class="align_center">1.43</td><td class="align_center">44.14</td></tr><tr><td class="align_left">GZ-3</td><td class="align_center">244</td><td class="align_center">15.2 × 10.0 × 2.3</td><td class="align_center">283.14</td><td class="align_center">4.76</td><td class="align_center">3.21</td><td class="align_center">60.13</td></tr><tr class="table-tr"><td colspan="7"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Testing results of one-single face true-triaxial unloading test under the true-triaxial condition with different support failure timings.</div>

Advances in Civil Engineering

tab5

Table 5

Table 5: Experimental Study of Influence of Support Failures on Rockbursts under True-Triaxial Condition 