Prediction of Rockburst Intensity Grade in Deep Underground Excavation Using Adaptive Boosting Classifier

Table 2

Inputs and output statistics of the present study.

Rockburst rank	Tangential stress, σθ (MPa)	Uniaxial compression strength, σc (MPa)	Uniaxial tensile strength, σt (MPa)	Elastic energy index,
3	90	170	11.3	9
2	90	220	7.4	7.3
2	62.6	165	9.4	9
…	…	…	…	…
3	89	236	8.3	5
3	98.6	120	6.5	3.8
4	108.4	140	8	5
Mean	59.988	123.443	7.03	4.861
Standard error	2.811	4.71	0.37	0.17
Standard deviation	36.108	60.498	4.79	2.185
Sample variance	1303.799	3660.031	22.98	4.773
Skewness	0.785	0.621	1.22	0.194
Minimum	2.6	18.32	0.38	0.85
Maximum	167.2	306.58	22.6	10.57
Count	165	165	165	165