Table 3 Comparison of dense drilling height.

From: Research on the pressure relief mechanism and application of roof dense drilling of gob side entry retaining by roadway-side filling

Scheme No.

Dense drilling height/m

Invariant

B1

5

Roadway section size,

Surrounding rock support strength,

Coal seam thickness,

Yieldable concrete parameters,

Dense drilling angle

B2

6

B3

7

B4

8

B5

9

B6

10

B7

11

Back to article page