Height of Mining-Induced Fractured Zones in Overlying Strata and Permeability of Rock with Nonpenetrative Fractures

Table 2

Tested sandstone specimens in this research.

Specimen	Length; (mm)	Diameter; (mm)	Mass; (g)	Dry density; (kg/m^3)	Clay content; (%)	Position of the NFZ
F1	99.26	49.57	458.88	2395.51	28.3	Upper
F2	100.05	49.57	462.88	2397.31	31.2	Middle
F3	99.63	49.33	455.63	2392.82	29.6	Lower
S1	97.92	49.48	453.04	2406.11	32.5	Upper
S2	99.96	49.58	464.61	2407.46	34.9	Middle
S3	98.73	49.59	458.67	2405.32	32.7	Lower
A2	100.82	49.58	464.77	2387.75	44.9	Lower
A4	99.89	49.4	456.66	2385.21	40.1	Middle
A5	100.79	49.58	463.89	2383.94	39.0	Upper