Study of the Roof Deformation Characteristics of Roadway Excavation Face and Unsupported Roof Distance

Table 5

Parameters of bolt and anchor cable.

Name	Diameter (mm)	Length (mm)	Spacing (mm × mm)	Quantity	Preload (kN)	Elastic modulus (Pa)	Cohesive force (Pa)	Stiffness of anchoring agent (Pa)
Bolt	20	2,000	1,000 × 1,000	5	80	2 × 10^10	1 × 10^5	2 × 10^7
Anchor cable	15.24	6,300	2,000 × 3,000	2/1/2	150	2.5 × 10^10	2 × 10^5	2 × 10^7