Advances in Civil Engineering

Research Article

Experimental Research on Brittleness and Rockburst Proneness of Three Kinds of Hard Rocks under Uniaxial Compression

Table 2

Summary of evaluation indexes for rockburst proneness.
Evaluation indexCalculation formulaAcquisition methodClassification standard
Rockburst proneness index [26, 27] is the elastic strain energy recovered during unloading, and is the energy dissipated in the loading and unloading cycle. 2.0, no rockburst;
 3.5, weak rockburst;
 5.0, medium rockburst;
 5.0, strong rockburst
Impact energy index [28] is the deformation energy stored before the peak strength, and is the deformation energy lost in the failure process.
 2, no rockburst;
 3, weak rockburst;
 3, strong rockburst.
Maximum stored elastic strain energy index [25] is the uniaxial compressive strength, and E is the elastic modus. < 0.2 MJ/m3, no rockburst;
0.2 MJ/m3 ,  < 0.5 MJ/m3, weak rockburst;
0.5 MJ/m3 ,  < 0.75 MJ/m3, medium rockburst;
 0.75 MJ/m3, strong rockburst.
Residual energy index [29]0, no rockburst;
 0, rockburst.