Stability Analysis of Surrounding Rock of Large Section Ultradeep Shaft Wall

Table 1

Each measuring point’s magnitude and direction of the principal stress in JCK-1 borehole [8].

Measuring point depth (m)	Vertical principal stress σv (MPa)	Self-weight stress σ (MPa)	Maximum horizontal principal stress σH (MPa)	Minimum horizontal principal stress σh (MPa)	Horizontal maximum principal stress direction θ
−950	26.41	26.46	32.78	14.52	N103°34′E
−1050	29.22	29.16	41.83	17.18	N103°42′E
−1150	33.33	31.86	35.37	16.64	N95°43′E
−1250	34.25	34.56	38.95	16.85	N110°13′E
−1350	35.98	37.26	41.23	16.44	N105°26′E
−1450	40.01	39.96	40.63	14.02	N111°20′E