Analysis on Influence Factors of Roadway Instability in High-Stress, Steeply Inclined Extra-Thick Coal Seam

Table 2

Summary of pull-out force of bolt with different anchorage lengths.

Type	Number	Design anchorage length (mm)	Actual anchorage length (mm)	Rod diameter (mm)	Failure load (kN)	Mean value (kN)
Screw thread steel	1	150	161	20	93.0	96.7
	2		178		102.5
	3		164		94.5
	4	300	285		142.3	145.1
	5		278		144.2
	6		293		148.9