Table 9 Average PPV value.

From: Calculation of hole spacing and surrounding rock damage analysis under the action of in situ stress and joints

Peripheral hole spacing/cm

Average PPV value/cm·s−1

Group 1

Group 2

Group 3

Group 4

40

189

132

92

63

45

175

123

87

60

50

104

75

56

41

55

75

58

42

28

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