Application and Principle of Bolt-Mesh-Cable Control Technology in Extremely Soft Coal Seam Roadway

Table 2

Mechanical parameters of the structural plane in the model.

Structural plane	Normal stiffness (GN·m^-1)	Tangential stiffness (GN·m^-1)	Angle of internal friction (°)	Cohesion (MPa)	Tensile strength (kPa)
Medium-grained sandstone	362	145	18	1.5	1.2
Fine-grained sandstone	164	66	15	1.0	1.0
Sandy mudstone	126	50.3	12	0.5	1.0
No. 2-1 coal	12	4.8	10	0.4	0.6
Mudstone	89.8	35.9	12	0.4	0.8
Sandy mudstone	167	66.8	15	0.1	1.0
Sandstone	166	66	20	1.5	1.2