Table 1 The ultrasonic testing results of the experimental samples.

From: Stability of surrounding rock in roadways with fractured rock mass: mechanisms and effects of layout optimization

Fracture dip angle

(\(\:^\circ\:)\)

Intact rock mass

0

15

30

45

60

75

90

Acoustic transit time

(\(\:\mu\:s)\)

Top

15.30

15.85

14.80

14.40

15.65

15.20

15.60

15.80

Middle

15.05

17.15

15.70

15.75

16.10

16.05

16.10

16.45

Bottom

15.10

15.20

14.65

14.45

15.60

15.30

15.45

15.75

Wave velocity

(\(\:m/s)\)

Top

3267.97

3154.57

3378.38

3472.22

3194.89

3289.47

3205.13

3164.56

Middle

3322.26

2915.45

3184.71

3174.60

3105.59

3115.26

3105.59

3039.51

Bottom

3311.26

3289.47

3412.97

3460.21

3205.13

3267.97

3236.25

3174.60

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