Experimental and Theoretical Investigation of Overburden Failure Law of Fully Mechanized Work Face in Steep Coal Seam

Table 1

Mechanical parameters of surrounding rock.

Lithology	Δ (m)	P (kg.m^-3)	E (GPa)	σc (MPa)	σt (MPa)	C (MPa)	υ	φ (°)
Siltstone	58.36	2590	19.5	56.26	1.84	55	0.21	37
Medium sandstone	40.4	2600	13.5	36.42	1.13	16	0.12	38
Siltstone	21.04	2590	19.5	56.26	1.84	55	0.21	37
Sandy mudstone	5.74	2150	5.4	28.65	0.75	45	0.18	31
Coal seam #6	1.75	1450	5.1	14	0.45	1.35	0.36	24
Medium sandstone	13.8	2800	14.2	36.42	1.13	16	0.12	38
Sandy mudstone	35.06	2150	5.4	28.65	0.75	45	0.18	31
Siltstone	27.65	2590	19.5	56.26	1.84	55	0.21	37