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Table 1 Physical and mechanical properties of rocks

From: Strata behavior at fully-mechanized coal mining and solid backfilling face

Rock

Elasticity modulus/GPa

Tensile strength/MPa

Cohesion/MPa

Poisson’s ratio

Density/kN/m3

Sandstone

28

6.0

13

0.26

23.8

Shale

25

3.5

7

0.23

24.2

Ji15 Coal

9

1.5

4

0.33

14.3

Mudstone

23

7.0

12

0.27

25.5