Table 3 Numerical simulation schemes for different deep reaming depths.

From: Study on the pressure relief energy dissipation law of variable-diameter boreholes in roadway surrounding rock

Scheme

1

2

3

4

5

Shallow Borehole Depth (m)

0

4

8

12

16

Deep Reaming Depth (m)

20

16

12

8

4

Shallow Borehole Diameter (mm)

100

100

100

100

100

Deep Reaming Diameter (mm)

250

250

250

250

250

Borehole Spacing (m)

1.0

1.0

1.0

1.0

1.0