Failure Mechanism and Control Technology for a Large-Section Roadway under Weakly Cemented Formation Condition

Table 2

Physico-mechanical parameters of ore-rocks.

Lithology	Density (kg/m^3)	Bulk modulus (GPa)	Shear modulus (GPa)	Tensile strength (MPa)	Cohesion (MPa)	Internal friction angle (°)
Fine sandstone	2650	6.2	4.8	2.2	3.2	43
Sandy mudstone	2600	2.52	1.5	1.3	1.9	40
3-1 coal	1600	1.6	1.13	0.9	1.3	32
Medium sandstone	2620	3.52	2.65	1.8	2.8	38