Table 3 The detailed design schemes of the orthogonal experiment.

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

Experimental number

A

Empty

B

C

1

1 (Single grouting hole)

1

1 (417 mm)

1 (40°)

2

1

2

2 (467 mm)

2 (65°)

3

1

3

3 (517 mm)

3 (90°)

4

2 (Double grouting holes)

1

2

3

5

2

2

3

1

6

2

3

1

2

7

3 (Triple grouting holes)

1

3

2

8

3

2

1

3

9

3

3

2

1

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