Reinforcement Effects of Isolation Piles on the Adjacent Existing Tunnel in Building Construction

Table 13

Influencing factors and levels.

Influencing factors	Level 1	Level 2	Level 3
Pile bottom depth (A)	1.8H	1.9H	2H
Pile top depth (B)	0.5Z	0.625Z	0.75Z
Pile spacing (C)	1.6 m	2.4 m	3.2 m
Pile diameter (E)	0.8 m	1 m	1.2 m