Table 1 Physical and mechanical parameters of coal specimens.

From: Mechanical behavior and reloading reinforcement characteristics of fractured coal under low confining pressure

Number

Density/g cm−3

P-wave velocity/m s

Uniaxial compressive stress/GPa

Elastic modulus/GPa

C-1

1.22

895.59

24.68

1.58

C-2

1.26

687.9

25.46

1.64

C-3

1.28

1104.65

27.61

1.95

Average

1.25

896.05

25.91

1.72

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