Table 1 Drilling parameters.

From: Research on the variation law of floor stress information entropy in upper protective layer mining based on Brillouin optical fiber sensing

Drill hole number

Azimuth (°)

Dip angle (°)

Aperture (mm)

Borehole depth (m)

Vertical height (m)

Dip offset (m)

Strike offset (m)

1#

270

15

110

133

34.42

128.47

0

2#

270

45

110

37

26.16

26.16

0

3#

200

20

110

108

36.94

34.71

95.37

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