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

Table 8

Numerical model support structure parameters.

Programs	Classification	Density (kg/m^3)	Elastic modulus (Pa)	Angle of friction (°)	Cross-section area (m^2)	Anchoring strength (MPa)	Anchoring stiffness (N/m)	Pretightening force (kN)
Programs 1	Bolt	7800	2 × 10^10	25	0.00038	1	2 × 10^7	100
	Anchor cable	8000	2 × 10^11	30	0.00028	1.6	2 × 10^8	150
Programs 2	Bolt	7800	2 × 10^10	25	0.00038	1	2 × 10^7	120
	Anchor cable	8000	2 × 10^11	30	0.00037	1.6	2 × 10^8	200