Research on Hydraulic Fracturing Pressure Relief Technology in the Deep High-Stress Roadway for Surrounding Rock Control

Table 1

In situ stress measurement results of hydraulic fracturing in Zaoquan coal mine.

Measuring point no.	Buried depth (m)	Fracturing parameters			Principal stress (MPa)			Fracture direction (°)	Saturated uniaxial compressive strength (MPa)
		Pb	Pr	Ps
1	608.8	5.44	5.03	3.99	6.52	3.78	15.22	N15.2°E	14.18
2	658.1	17.30	10.28	9.00	16.30	8.79	16.45	N23.2°E	12.93
3	525.4	11.74	7.47	6.13	10.49	5.91	13.14	N15.5°E	28.75
4	571	11.34	6.60	6.21	11.65	6.02	14.28	N8.2°E	29.64