Identifying Effective Rock-Breaking Ratio Based on Rock Chip Information for Rock-Breaking Efficiency Evaluation of TBM

Table 6

Rock-breaking efficiency evaluation indices of TBM.

Group	Project	Lithology	Hardness	Integrity grade	Effective rock-breaking ratio (, %)	Coarseness index (CI)	Specific energy (SE, MJ/m^3)	Thrust force (TF, kN)
1	Lanzhou TBM 1	Hornblende quartz schist	Hard	II	99.60	430.81	51.58	9000
2					99.71	448.88	32.22	8000
3					99.78	454.06	29.26	6500
4		Granite			99.81	429.67	46.15	8500
5					99.90	457.58	38.06	8000
6	Lanzhou TBM 2	Sandy mudstone and siltstone interbedded	Soft	III	98.57	326.74	29.87	4500
7					99.26	347.60	19.94	4000
8					99.18	328.00	27.40	4500
9					99.35	350.66	19.62	2500
10					99.40	366.00	17.36	1500
11	Wananxi TBM	Quartz sandy conglomerate	Hard	II	98.96	350.74	68.82	5000
12					98.50	377.28	78.51	5500