Rockburst Prediction on the Superimposed Effect of Excavation Accumulation Energy and Blasting Vibration Energy in Deep Roadway

Table 1

Geostress data from in situ monitoring.

No.	Depth (m)	Maximum principal stress σ1			Intermediate principal stress σ2			Minimum principal stress σ3
		Value (MPa)	Direction (°)	Dip angle (°)	Value (MPa)	Direction (°)	Dip angle (°)	Value (MPa)	Direction (°)	Dip angle (°)
1	510	24.55	129	4	16.35	−138	2	14.49	133	−85
2	510	24.64	−111	3	15.68	155	82	15.02	161	−10
3	555	25.71	−45	−13	14.00	14	73	13.00	50	−20
4	645	29.57	112	−3	19.56	−177	−80	15.48	−156	−9
5	600	28.88	103	1	16.54	10	76	14.77	13	−8
6	600	30.17	110	−6	18.83	24	−11	16.94	236	−70
7	690	31.50	−80	2	19.08	230	−79	17.54	10	−10
8	690	29.77	−83	4	20.84	−8	−74	19.63	8	15
9	750	33.22	119	−10	19.93	−89	−82	17.10	208	−8
10	795	48.93	164.09	3	23.15	74.41	−5.97	21.66	47.22	83.29
11	825	46.95	40.06	3.84	28.88	−49.55	−5.77	26.49	−83.43	83.06