Experimental Investigation on the Influence of Regional Concrete Spalling on Shield Tunnel Segments

Table 6

Groups of test schemes.

Grouping number	Assembly method	Center point for the target block “F”	Range of regional spalling	Spalling length (mm)	Spalling width (mm)	Spalling depth (mm)
1	Relatively rotate 180°between segment rings	45°left to the bottom of the arc	None	0	0	0
2			45° at vault	2159.8	15.5	8.0
3			60° at vault	2879.8	15.5	8.0
4			75° at vault	3599.7	15.5	8.0