Study on Safety Control of Large-Section Roadway with High Stress and Broken Surrounding Rock

Table 1

Mechanics calculation parameters of strata.

Name	Bulk modulus B (GPa)	Shear modulus S (GPa)	Cohesion C (MPa)	Internal friction angle Φ (°)	Tensile strength Rt (MPa)	Density γ (g·cm^−3)
Lamellar shale	6.79	4.47	2.65	31	1.20	2.50
Sweeping groove coal seam	4.15	1.36	1.10	19	0.60	1.40
Thin shale	6.79	4.47	2.65	31	1.20	2.50
Coal seam 1	4.15	1.36	1.10	19	0.60	1.40
Grayish-black fine sandstone	21.00	10.23	4.25	39	1.85	2.64
Coal seam 2	4.15	1.36	1.10	19	0.60	1.40
Layered medium-fine sandstone	21.00	10.23	4.25	37	1.85	2.64