Table 2 Center Sound Level and Exposure Time for Each Segment.

From: The impact of obstacle parameters on mid-high frequency noise propagation in comprehensive mining workfaces and safety implications

Section Number

1

2

3

4

5

6

7

8

Center Sound Level(Li)/dB

80

85

90

95

100

105

110

115

Exposure time(Tn)/min

T1

T2

T3

T4

T5

T6

T7

T8

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