Mechanism and Control Technology of Rockburst Induced by Thick Hard Roof and Residual Coal Pillar: A Case Study

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left">Density (kg m<sup>-3</sup>)</td><td class="align_center">Bulk modulus (GPa)</td><td class="align_center">Shear modulus (GPa)</td><td class="align_center">Internal friction angle (°)</td><td class="align_center">Dilation angle (°)</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left">1800</td><td class="align_center">15</td><td class="align_center">1</td><td class="align_center">0.1</td><td class="align_center">0.1</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Parameters of double-yield materials in 4-2 goaf.</div>

Geofluids

tab4

Table 4

Table 4: Mechanism and Control Technology of Rockburst Induced by Thick Hard Roof and Residual Coal Pillar: A Case Study 