Evolution of Characteristics of the Zone of Rock Loosening with Cross-Sectional Area

Table 1

Model parameters.

Rock	Youngs modulus/GPa	Poisson ratio/GPa	Density/kgm^-3	Cohesion/MPa	Internal friction angle (°)
Sandy mudstone	6.2	0.17	2676	7.80	36
Fine sandstone	7.2	0.17	2787	3.5	37
Mudstone	5.6	0.18	2700	2.60	38
Coal	1.06	0.30	2460	2.35	22
Siltstone	5.65	0.22	2672	2.35	32