Table 5 The results of variance analysis based on the orthogonal experiment.

From: Experimental research on the structural optimization of grouting holes in circular and rectangular pipe sections for trenchless pipe jacking

Shape of pipe sections

Source of variation

Sum of squared deviations

Degree of freedom

Mean sum of squares

F-ratio

F critical values

Significance

Circular pipe sections

A

12438.222

2

6219.111

128.376

F0.1(2,2) = 9

Significant

B

1340.222

2

670.111

13.833

F0.05(2,2) = 19

More significant

C

508.222

2

254.111

5.245

F0.01(2,2) = 99

Insignificant

Error e

96.889

2

48.444

N/A

N/A

N/A

Total T

14383.555

8

N/A

N/A

N/A

N/A

Rectangular pipe sections

A

17,912

2

8956

30.223

F0.1(2,2) = 9

More significant

B

372.667

2

186.333

0.629

F0.05(2,2) = 19

Insignificant

C

760.667

2

380.333

1.283

F0.01(2,2) = 99

Insignificant

Error e

592.667

2

296.334

N/A

N/A

N/A

Total T

19638.001

8

N/A

N/A

N/A

N/A

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