Study on the Upper Limit of Roof Failure in Soft Rock Roadway

Table 3

Parameters of bolt and anchor cable.

Anchor type		Length (m)	Diameter (mm)	Spacing (mm)	Array pitch (mm)	Breaking load (N)
The roof bolt	Prototype	2.40	22.0	900	900	197820
	Model	0.24	2.2	90	90	123.60
The bolt in the sidewall	Prototype	2.20	20.0	1100	900	179836
	Model	0.22	2.0	110	90	112.40
Anchor cable	Prototype	7.20	18.9	900	900	391000
	Model	0.72	1.89	90	90	182.120