Table 6 Table of reduction rate of P5 peak overpressure.

From: Experimental study of energy attenuation of protruding shock waves in mines under elastic device buffering

Groups

Schemes

Changes in effective sections

P5max/kPa

reduction rate /%

Experimental group I

1

Without elastic devices

102.3

 

2

Unchanged

32.3

68.4

3

Smaller

35.9

64.9

4

Larger

47.3

53.8

Experimental group II

5

Without elastic devices

119.9

 

6

Unchanged

48.6

59.4

7

Smaller

49.5

58.7

8

Larger

72.2

39.7

Experimental group III

9

Without elastic devices

141.0

 

10

Unchanged

65.6

53.5

11

Smaller

71.4

49.4

12

Larger

93.6

33.7