Table 4 Free space filling amount of each rock formation.

From: Study of the development patterns of water-conducting fracture zones under karst aquifers and the mechanism of water inrush

Rock lithology

Stratum thickness (m)

Middle stratum thickness (m)

Expansion coefficient

Free space volume (m)

Limestone

38.53

19.27

1.044

− 0.73

Mudstone

1.36

0.68

1.053

0.96

Limestone

1.95

0.98

1.054

1.03

Silty mudstone

4.56

2.28

1.056

1.14

Siltstone

2.08

1.04

1.059

1.40

Fine sandstone

2.90

1.45

1.061

1.52

Coal seam 4

0.78

0.39

1.063

1.70

Fine sandstone

4.48

2.24

1.066

1.75

Coal seam 5

2.50

1.25

1.071

2.04

Silty mudstone

2.20

1.10

1.075

2.22

Mudstone

1.61

0.81

1.080

2.39

Siltstone

5.07

2.54

1.094

2.52

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