Table 4 Numerical simulation schemes for different deep reaming spacings.

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

Scheme

1

2

3

4

5

Borehole spacing (m)

0.5

1.0

1.5

2.0

2.5

Shallow borehole diameter (mm)

100

100

100

100

100

Deep reaming diameter (mm)

250

250

250

250

250

Shallow borehole depth (m)

4

4

4

4

4

Deep reaming depth (m)

16

16

16

16

16

Back to article page