Systematic Performance Evaluation of Shield TBM Cutters for Excavating Multiple Soft Rock

Table 4

PPM (nondimensional).

	C1–S1	C1–S2	C1–S3	C2–S1	C2–S2	C2–S3	C3–S1	C3–S2	C3–S3
SE	5.75	3.20	1.32	1.51	5.66	7.92	2.65	4.72	8.62
CC	4.89	4.33	1.44	3.00	5.42	6.17	6.67	6.92	9.08
	7.00	7.63	8.50	6.75	7.75	5.88	7.75	8.50	6.75
σmax	7.78	10.00	10.00	1.15	5.53	9.22	0.82	5.29	9.13
	2.96	4.38	9.70	5.68	1.72	9.55	5.28	1.06	9.44