Pullout Test on Fully Grouted Bolt Sheathed by Different Length of Segmented Steel Tubes

Table 1

Samples grouping and labels specification.

Sample labels	Combining forms	Sample labels	Combining forms
S1 (S1-1, S1-2, S1-3)	15 + 5 + 5 + 5	S5 (S5-1, S5-2, S5-3)	9 + 7 + 7 + 7
S2 (S2-1, S2-2, S2-3)	15 + 5 + 10	S6 (S6-1)	10 + 5 + 15
S3 (S3-1, S3-2, S3-3)	15 + 10 + 5	S7 (S7-1, S7-2)	10 + 10 + 10
S4 (S4-1, S4-2)	15 + 15	S8 (S8-1, S8-2)	10 + 15 + 5

The terms sequence means the order for different lengths of segments from tube-clamp end to bolt-clamp end.