Influence of Water Inrush from Excavation Surface on the Stress and Deformation of Tunnel-Forming Structure at the Launching-Arrival Stage of Subway Shield

Table 1

Overview of shield machines in the XW section.

No.	Item	Liaoning 33 shield machine	Komatsu shield machine
1	Shield type/model	Composite earth-pressure balance/RME254	Composite earth pressure balance/TM641PMM
2	Diameter of excavation	6480 mm	6480 mm
3	Cutter head shield length	9.62 m	9.33 m
4	Length	73.62 m	67.28 m
5	Weight	450 t	450 t
6	Minimum turning radius	250 m	250 m
7	Maximum thrust	36000 kN	40018 kN
8	Rated torque	6650 kN·m	7500 kN·m
9	Torque relief	8320 kN·m	9000 kN·m
10	Maximum tunneling speed	100 mm/min	80 mm/min
11	Total equipment power	1855 kW	1402 kW
12	Cutter head opening rate	40%	38%
13	Central opening rate of the cutter head	50%	—