Discrete Element Simulation of Roadway Stability in an Efflorescent Oxidation Zone

Table 5

Calibrated microparameters.

Lithology	Matrix properties			Contact properties
	Density (kg/m^3)	K (GPa)	G (GPa)	kn (GPa/m)	ks (GPa/m)	Cj (MPa)	Φj (peak/residual, °)	(MPa)
Mudstone #1	2370	0.53	0.32	54.69	21.88	1.85	35/30	0.30
Gritstone #1	2652	0.86	0.57	91.30	36.52	4.20	37/33	0.80
Mudstone #2	2346	0.23	0.12	22.29	8.92	1.15	35/30	0.20
Number 9 coal	1498	0.13	0.08	13.67	5.47	0.70	30/24	0.10
Mudstone #3	2346	0.30	0.21	31.92	12.77	1.45	35/30	0.28
Medium-fine sandstone	2641	1.98	1.30	208.69	83.47	6.30	30/24	1.00
Gritstone #2	2450	1.93	1.16	113.29	45.32	6.90	37/33	1.20
Mudstone #4	2332	1.36	0.70	133.73	53.49	3.60	35/30	0.50
Number 11 coal	1498	0.98	0.51	96.58	38.63	2.70	30/24	0.40