Table 1 Rock test results of overlying strata.

From: Failure and development height of overlying rock of a water flowing fracture in goaf under a karst aquifer

Lithology

Compressive strength

(Mpa)

Modulus of elasticity (Gpa)

Poisson’s ratio

Cohesion (Mpa)

Internal friction

(°)

Tensile strength (Mpa)

Siltstone

44.55

18.50

0.29

3.80

39.50

2.39

Fine sandstone

50.75

38.70

0.28

3.70

38.90

8.06

Mudstone

18.50

11.90

0.20

1.40

34.10

1.59

Silty mudstone

29.30

14.90

0.21

2.90

27.20

2.57

Argillaceous limestone

37.50

26.40

0.20

3.70

41.50

3.87

Limestone

42.20

40.00

0.20

4.00

40.30

8.80

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