Research on Deformation Mechanisms of a High Geostress Soft Rock Roadway and Double-Shell Grouting Technology

Table 2

Physical and mechanical parameters of the surrounding rock.

No.	Lithology	Tensile strength (MPa)	Friction angle (°)	Poisson’s ratio	Cohesion (MPa)	Compressive strength (MPa)	Elastic modulus (GPa)
1	Coal	0.64	47.20	0.11	2.35	14.20	5.8 × 103
2	Shale	0.79	33.60	0.12	4.28	19.70	6.3 × 10^3
3	Mudstone	1.32	47.70	0.18	1.52	17.71	8.8 × 10^3