Distribution Law of Mining Stress of the Gob-Side Entry Retaining in Deep Mining Thin Coal Seam

Table 1

Basically physical and mechanical parameters.

	The lithology	Volume modulus (GPa)	Shear modulus (GPa)	Cohesive force (MPa)	Tensile strength (MPa)	Within the angle of wipe (°)	Density (kg/m^3)
1	Pulverous sandstone	6.53	3.92	16	2.6	42	2690
2	Coal seam	1.94	1.46	3	1.2	35	1400
3	Pulverous sandstone	11.0	6.60	15	2.7	38	2697
4	Medium sandstone	2.60	1.56	8	2.9	37	2688
5	Coarse sandstone	3.53	2.12	10	1.7	42	2741
6	Medium sandstone	2.60	1.56	13	2.9	48	2665
7	Fine sandstone	10.49	6.30	15	2.6	55	2690
8	Pulverous sandstone	6.53	3.92	16	2.6	42	2690
9	Goaf	0.5	0.3	0.1	0.1	35	2600