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Table 2 Important technical parameters of the 10.22 m diameter shield

From: Use of a 10.22 m diameter EPB shield: a case study in Beijing subway construction

Items Parameters
Excavation diameter (mm) 10,220
External diameter (mm) 10,000
Internal diameter (mm) 9000
Segment thickness (mm) 500
Segment ring width (mm) 1800
Configuration of segments 9 (8 + 1 keystone)
Machine length (mm) 11550
Cutterhead rotation speed (r/min) 0–0.68
Advance rate (mm/min) 0–85
Total thrust (kN) 108,000
Maximum torque coefficient (α) α = 32.2
Working torque (kN m) 22,896–34,344