Study on Anchor Cable instead of Single Hydraulic Prop Support in Advance Support of Deep Roadway

Table 3

Data of borehole peeping instrument.

	Fracture development area (m)	Separation zone (m)	Crushing zone (m)
1#	0.1–0.4	0.8–1.0	0.5–0.8
	1.9–2.2		1.9–2.2
2#	0.8–1.3	0.4–0.8	0.8–1.8
3#	0.1–1.0	1.5–1.6	1.0–1.4
			2.7–3.0
4#	0.1–0.5	0.7–1.0	1.5–2.2
5#	0.1–1.0	1.6–1.8	0.9–1.1
			1.4–2.7
6#	0.1–0.3	0.7–1.2	0.9–1.1
			1.4–2.7
7#	0.1–0.7	1.7–1.9	0.3–1.4
	0.9–1.4
8#	0.3–0.7	2.7–3.0	1.6–3.0
9#	0.1–0.3	\	1.7–1.8
			2.6–3.0