Accurate Perception of Rock Strata Movement for Environmental Protection in Coal Mining: Taking Thick and Hard Roof Cooperative Control as an Example

Table 1

Physical-mechanical parameters and ratio of coal rock in the model.

Name	Thickness (m)	Tensile strength (MPa)	Modulus of elasticity (GPa)	Cohesion (MPa)	Compressive strength (MPa)		Volume weight (g/cm^3)		Matching
					Prototype	Model	Prototype	Model	Sand : plaster : lime
Sandy mudstone	65.0	6.45	5.72	2.17	42.47	0.23	2.65	1.70	4 : 3 : 7
Fine sandstone	4.80	9.57	3.72	1.98	69.58	0.37	2.64	1.69	4 : 3 : 7
Conglomerate	60.0	4.50	1.79	7.30	67.79	0.36	2.72	1.74	3 : 3 : 7
Mudstone	1.20	2.61	0.99	3.87	19.01	0.10	2.51	1.61	3 : 7 : 3
Fine sandstone	4.20	11.56	2.72	9.15	69.76	0.37	2.64	1.69	4 : 3 : 7
Mudstone	6.36	3.06	3.06	1.94	7.42	0.0.4	2.34	1.50	3 : 7 : 3
8# coal	9.60	1.05	1.98	1.63	7.78	0.15	1.43	0.91	5 : 3 : 7