Experimental Study on the Complex Contact Frictional Property of an Ultralong Distance Large-Section Concrete Pipe Jacking and Prediction of Pipe String Stuck

Table 4

Prediction of the maximum number of pipes driven by adjacent IJSs under different contact conditions.

Contact condition	Curve series	μint	γ (kN/m^3)	r (m)	φr (°)	π	D (m)	JFfrict (kN)	L (m)	Pipe quantity
A	(I)	0.55	25.0	1.585	31	3.14	3.17	22000	123.67	49
	(II)	0.52							130.81	52
B	(I)	0.58							117.27	46
	(II)	0.53							128.34	51
C	(I)	0.35							194.34	77
	(II)	0.47							144.72	57
D	(I)	0.47							144.72	57
	(II)	0.65							104.64	41
E	(I)	0.45							151.16	60
	(II)	0.65							104.64	41
F	(I)	0.44							154.59	61
	(II)	0.65							104.64	41
G	(I)	0.45							151.16	60