Geological Core Ground Reorientation Technology Application on In Situ Stress Measurement of an Over-Kilometer-Deep Shaft

Table 1

Kaiser stress of AE tests.

	Kaiser stress in the vertical direction (MPa)		Kaiser stress in the horizontal direction (MPa)
			σI (0°)		σII (45°)		σIII (90°)
Borehole depth (m)	Actual value	Average value	Actual value	Average value	Actual value	Average value	Actual value	Average value
200	5.26	5.10	13.94	18.27	18.00	16.35	4.29	5.10
	5.52		19.75		14.11		5.33
	4.52		22.14		15.62		5.29
	—		17.23		17.69		5.48
400	11.09	12.35	21.72	20.02	18.73	18.71	9.44	11.96
	13.10		14.75		17.61		13.44
	12.85		17.51		21.97		15.92
	—		26.08		16.52		9.03
600	16.60	16.58	25.24	22.47	16.60	13.00	4.16	5.55
	16.60		21.63		14.41		8.63
	16.55		23.65		10.91		4.98
	—		19.34		10.09		4.42
800	16.61	19.91	22.61	23.06	15.54	20.15	9.41	9.73
	27.62		22.32		19.88		8.75
	15.51		25.06		18.59		11.95
	—		22.25		26.59		8.80
900	17.80	23.75	30.08	24.64	20.88	21.33	11.26	11.64
	22.76		22.10		23.87		12.19
	30.69		24.31		18.99		13.04
	—		22.09		21.58		10.07
1000	26.52	25.69	32.57	26.12	15.52	18.65	15.65	13.41
	21.80		24.80		17.59		10.28
	28.76		25.30		19.49		13.40
	—		21.80		21.99		14.33