Estimations of the Jacking Forces of Large-Sized Rectangular Jacking Pipes Based on a Displacement Control Method

Table 14

The logarithmic function coefficients a and b of the jacking force.

Case A1 [y = a ln (x) − b]			Case B1 [y = a ln (x) − b]			Buried depth (m)
a	b	The outer wall perimeter (m)	a	b	The outer wall perimeter (m)
6471.0	8985.8	25.8	11099	14352	34.7	3.5
6497.1	7775.6		14804	21232		5.5
7150.4	7593.3		19381	29776		7.5
7661.1	7201.7		23851	37053		9.5