Table 3.

Coal and rock mechanics parameters.

Rock Strata	Thickness (m)	Density (Kg/m3)	Elastic Modulus (Pa)	Poisson’s Ratio	Tensile Strength (Pa)	Cohesion (Pa)	Internal Friction (°)
loose layer	50	1700	1.34 × 109	0.42	1.30 × 105	1.00 × 105	30
clay layer	5	1700	1.34 × 109	0.42	1.30 × 105	1.00 × 105	30
sandy mudstone	5	2697	8.37 × 109	0.3	1.76 × 107	2.14 × 106	44
sandstone layer	1	2684	1.56 × 1010	0.3	2.65 × 107	3.77 × 106	44
mudstone layer	1	2740	9.11 × 109	0.3	1.54 × 107	1.59 × 106	44
sandstone layer	0.5	2684	1.56 × 1010	0.3	2.65 × 107	3.77 × 106	44
sandy mudstone	2	2697	8.37 × 109	0.3	1.76 × 107	2.14 × 106	44
sandstone layer	1	2684	1.56 × 1010	0.3	2.65 × 107	3.77 × 106	44
sandy mudstone	5	2697	8.37 × 109	0.3	1.76 × 107	2.14 × 106	44
medium-grained sandstone layer	9	2684	1.56 × 1010	0.3	2.65 × 107	3.77 × 106	44
sandy mudstone	6	2697	8.37 × 109	0.3	1.76 × 107	2.14 × 106	44
mudstone layer	0.5	2740	9.11 × 109	0.3	1.54 × 107	1.59 × 106	44
coal seam	3.5	1426	2.80 × 109	0.32	9.50 × 106	2.60 × 106	30
sandy mudstone	20	2697	8.37 × 109	0.3	1.76 × 107	2.14 × 106	44