Table 2 The detailed factors and levels of the orthogonal experiment.

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

Levels

Factors

A

B

C

Layout of grouting holes

Spacing between adjacent grouting holes S (mm)

Deflection angle of grouting holes α (°)

1

Single grouting hole

417

40

2

Double grouting holes

467

65

3

Triple grouting holes

517

90

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