Analysis of Crustal Stress and Its Influence on the Stability of the Deep Tunnel in the Huanaote Mining Area

Table 3

Calculation results of principal stress at each measuring point.

No.	Burial depth (m)	Maximum horizontal principal stress			Minimum horizontal principal stress			Vertical principal stress
		Value (MPa)	Orientation (°)	Dip (°)	Value (MPa)	Orientation (°)	Dip (°)	Value (MPa)	Orientation (°)	Dip (°)
1^#	526	20.74	212.58	−2.73	7.28	122.74	3.32	10.97	−136.72	85.69
2^#	526	19.63	267.8	8.38	7.36	177.76	0.25	11.67	86.10	81.61
3^#	576	19.91	213.89	−9.10	10.33	306.21	14.10	12.66	92.03	73.11
4^#	576	23.0	209.98	−11.75	10.6	123.36	15.83	12.7	−95.09	70.08
5^#	626	27.22	250.01	9.99	11.30	332.96	−34.87	15.99	173.69	−53.30
6^#	776	35.69	241.39	−0.56	14.69	151.56	16.15	18.82	−30.52	73.84
7^#	796	37.97	261.75	9.93	18.57	167.01	25.24	21.25	11.51	62.61