Table 1.
Classification standard of rockburst intensity grading features.
Table 2.
The corresponding prediction index grading standard.
Table 3.
The rockburst intensity predictive index values and corresponding normalized values of Ideal Rock Masses.
Table 4.
Predictive index values of rockburst cases in underground engineering at home and abroad.
Fig 1.
The distribution of predictive indexes for each case.
Index 1 is σθ/σc, the ratio of rock shear stress and uniaxial compressive strength. Index 2 is σc/σt, the ratio of rock uniaxial compressive strength and tensile strength. Index 3 is Is, the brittleness index of rock. Index 4 is Wet, the elastic energy index of rock.
Fig 2.
The distribution of variable weights for each case.
Index 1 is σθ/σc, the ratio of rock shear stress and uniaxial compressive strength. Index 2 is σc/σt, the ratio of rock uniaxial compressive strength and tensile strength. Index 3 is Is, the brittleness index of rock. Index 4 is Wet, the elastic energy index of rock.
Table 5.
Weight values of predictive indexes for ideal rock mass and engineering cases.
Table 6.
The comprehensive correlation degrees and rockburst intensity grading variables of each ideal rock mass.
Table 7.
Rockburst intensity feature grades and grading variable interval.
Table 8.
Prediction results 1.
Table 9.
Prediction results 2.