Roadway Support in Deep “Three-Soft” Coal Seam: A Case Study in Yili Mining Area, China

Table 2

Mechanical parameters of coal and rock samples.

Properties	Tension (Mpa)	Compression (Mpa)	Young (Mpa)	Poisson	Friction (°)	Cohesion (Mpa)
Fine sandstone	0.60	4.22	1336	0.20	39	2.43
Roof mudstone	0.66	3.11	1032	0.24	35	2.19
3# coal seam	0.21	6.20	1140	0.26	32	1.98
Floor mudstone	0.77	4.56	1075	0.23	36	1.83
Sandy mudstone	0.69	9.61	1991	0.23	42	2.32
Medium sandstone	0.72	5.65	1683	0.21	43	2.72