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Geofluids
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2020
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Article
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Tab 1
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Research Article
Physical Simulation of the Water-Conducting Fracture Zone of Weak Roofs in Shallow Seam Mining Based on a Self-Designed Hydromechanical Coupling Experiment System
Table 1
Main physical and mechanical properties of rock strata.
Layer number
Lithology
Density (kg/m
3
)
Compressive strength (MPa)
Poisson’s ratio
Modulus of elasticity (GPa)
1
Silt
1700
0.7
0.31
1.6
2
Gravel
2450
12.0
0.24
22.0
3
Mudstone
2300
9.5
0.30
7.6
4
Coarse sandstone
2410
23.2
0.27
17.8
5
Muddy siltstone
2350
19.6
0.26
14.8
6
Mudstone
2300
9.5
0.30
7.6
7
Middle sandstone
2450
26.0
0.25
22.4
8
Fine sandstone
2550
27.5
0.26
23.2
9
Mudstone
2300
9.5
0.30
7.6
10
Fine sandstone
2550
27.5
0.26
23.2
11
Mudstone
2300
9.5
0.30
7.6
12
Siltstone
2500
25.5
0.26
22.0
13
Carbonaceous mudstone
2250
8.4
0.29
6.8
14
21-1 coal
1400
6.8
0.28
3.2
15
Mudstone
2300
9.5
0.30
7.6