Effect of Compressive Behaviours of Tail Salt Filling Materials on Roof Deformation in Potash Mine

Table 4

Physical and mechanical parameters of the ore body.

No.	Lithology	Height (m)	Density (kg/m^3)	Tensile (MPa)	Cohesion (MPa)	Internal friction angle (°)	Bulk modules (GPa)	Shear modulus (GPa)
12	Silty clay	5	2500	3.83	4.2	31	2.0	1.6
11	Ferromanganese nodules	3	5500	2.67	5.3	27	4.0	2.1
10	Sandy gravel	4	3000	2.29	6.5	28	3.0	2.1
9	Carbonaceous mudstone	47	3500	2.27	5.4	27	3.5	1.6
8	Anhydrock	15	2000	1.49	6.3	26	2.0	1.8
7	Silty mudstone	50	2510	2.27	5.0	26	2.51	1.5
6	Halite	113	2125	2.17	5.0	25	1.1	0.6
5	Mudstone	60	2239	2.23	3.90	25	1.18	0.58
4	Sylvite	4	2081	2.13	3.93	28	1.08	0.56
3	Tail salt	4	2802	—	—	—	0.5	0.36
2	Carnallite	12	1830	1.43	3.13	26	0.6	0.3
1	Halite	30	2125	1.87	3.5	26	2.0	1.2