Full-Scale Laboratory Test of Cutting Large-Diameter Piles Directly by Shield Cutterhead

Table 3

Test results for cutting C35 reinforced concrete layer with disc cutters.

Position of cut	Penetration speed (mm/min)	Rotating speed (r/min)	Total thrust (kN)		Torque (kN·m)		Evaluation of test results
			Ave.	Max.	Ave.	Max.
Concrete layer	9.47	0.61	1942	—	72	—	No stuck, low efficiency
	17.25	0.61	—	3862	—	387	Stuck
	6.47	1.03	—	2500	—	200	No stuck, low efficiency
Reinforced concrete layer	8.36	0.57	2980	3512	206	275	Relatively stable
	13.30	0.51	3200	4052	200	381	Stuck