Stability Analysis of Surrounding Rock of Large Section Ultradeep Shaft Wall

Table 3

Normalization treatment of surrounding rock stress at different depths.

Position (m)	σ1 (MPa)	σ3 (MPa)	σc (MPa)	Normalized value of deviatoric stress (MPa)	Normalized value of average stress (MPa)	Judgment result
−950	38.481	20.586	102.5	0.09	0.29	I
−1050	41.981	22.686	102.5	0.09	0.32	I
−1150	45.481	24.786	102.5	0.10	0.34	I
−1250	48.981	26.886	102.5	0.11	0.37	I
−1350	52.481	28.986	102.5	0.11	0.40	I
−1450	55.981	31.086	102.5	0.12	0.42	I