Determination of the Installation Time of Secondary Liner during Excavation of Large Cross-Section Double-Arch Tunnels

Table 6

Fitting equation and actual displacement of each section.

Monitoring section	Fitting equation	Relation coefficient	Actual total displacement
Section 1	U = 32.405[exp (−0.106t) − 1]	0.99488	51.5
Section 2	U = 33.504[exp (−0.083t) − 1]	0.98665	52.0
Section 3	U = 31.840[exp (−0.090t) − 1]	0.98531	49.8