Mining-Induced Damage Characteristics of Floors during Fully Mechanized Caving Mining: A Case Study

Table 1

Lithology and mechanical parameters of the floor strata rocks.

Drilling distance from floor	Strata rocks	Tensile strength (MPa)	Compressive strength (MPa)	Poisson ratio	Elastic modulus (GPa)
–	Roof	9.43	47.57	0.28	46.49
–	Coal	0.36	14.60	0.25	2.50
2.300–3.570	Mudstone	1.12	15.47	0.27	15.31
3.570–3.700	Allophone mudstone	1.12	15.47	0.27	15.31
3.700–4.700	Sandy mudstone	2.61	19.71	0.26	27.00
4.700–8.700	Mudstone	1.12	15.47	0.27	15.31
8.700–13.035	Allophone mudstone	1.12	15.47	0.27	15.31
13.035–13.190	Coal	0.81	14.60	0.23	2.7
13.190–13.310	Carbonaceous mudstone	2.27	23.41	0.26	10.03
13.310–13.868	Allophone mudstone	1.12	15.47	0.27	15.31
13.868–15.874	Sandy mudstone	2.61	19.71	0.26	27.00
15.874–18.632	Mudstone	2.30	15.22	0.25	8.0
18.632–20.679	Mudstone	1.12	15.47	0.27	15.31
20.679–22.500	Sandstone	10.95	55.26	0.21	22.67