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Table 5 Variance analysis of the main factors of PE

From: Plugging efficiency of pouring aggregates through multiple boreholes into an inundated tunnel to prevent groundwater inrush disasters

Source of deviation

Deviation sum of squares

Degrees of freedom

Mean square error

F ratio

F0.025 (3,3) critical value

F0.05 (3,3) critical value

Particle size of aggregates A

55.99

3

18.66

12.93

15.44

9.28

Distance between boreholes B

31.95

3

10.65

7.38

15.44

9.28

Initial water flow rate C

102.18

3

34.06

23.59

15.44

9.28

Tunnel inclination D

25.04

3

8.35

5.78

15.44

9.28

Error

4.33

3

1.44

  Â