Strata Movement and Fracture Propagation Characteristics due to Sequential Extraction of Multiseam Longwall Panels

Table 4

Prototype material properties and mixture proportions of the construction material.

Rock mass	Prototype rock mass parameters				Model mixture
	Compressive strength (MPa)	Tensile strength (MPa)	Density (kg/m^3)	Poisson’s ratio	Sand : kalk : plaster
Fine sandstone	98.76	1.03	2600	0.23	6 : 0.6 : 0.4
Mudstone	35.70	0.07	2680	0.25	7 : 0.7 : 0.3
Coal	18.87	0.03	1530	0.21	10 : 0.5 : 0.5
Siltstone	11.45	0.83	2591	0.22	9 : 0.5 : 0.5
Sandy mudstone	42.52	0.33	2720	0.22	8 : 0.7 : 0.3
Fine sandstone	90.42	1.06	2660	0.22	6 : 0.6 : 0.4
Medium-grained sandstone	60.45	0.55	2700	0.23	8 : 0.7 : 0.3