Study on the Development Height of Overburden Water-Flowing Fracture Zone of the Working Face

Table 1

Test results of physical and mechanical parameters.

Sample No.	Rock name	Uniaxial compressive strength (MPa)	Average (MPa)	Tensile strength (MPa)	Average (MPa)	Elastic modulus(GPa)	Average (GPa)	Bulk density (g/cm^3)	Average (g/cm^3)
1	No. 4 fine sandstone	69.91	69.78	9.47	9.25	6.65	8.29	2.56	2.54
2	No. 6 fine sandstone	65.33		8.55		8.60		2.58
3	No. 8 fine sandstone	69.07		9.21		8.01		2.55
4	No. 10 fine sandstone	71.26		9.55		7.88		2.56
5	No. 12 siltstone	73.63		9.90		10.07		2.43
6	No. 14 fine sandstone	70.08		9.33		8.24		2.56
7	No. 16 fine sandstone	68.52		8.74		8.59		2.54
8	No. 3 sandy mudstone	28.57	25.61	2.11	1.76	2.96	2.96	2.43	2.39
9	No. 5 mudstone	21.43		1.80		2.73		2.35
10	No. 7 mudstone	24.18		1.91		2.74		2.41
11	No. 9 mudstone	21.66		2.36		3.52		2.39
12	No. 11 mudstone	30.40		1.42		2.99		2.39
13	No. 13 mudstone	27.43		1.17		2.73		2.35
14	No. 15 mudstone	25.63		1.55		3.11		2.40
15	No. 17 mudstone	25.61		1.76		2.89		2.37
16	No. 18 conglomerate	55.70	55.70	6.63	6.63	6.80	6.80	2.63	2.63