Investigation of Water Leakage of Metro Segments Caused by Metro Underpass Structures

Table 1

Main parameters of Herrick shield machine.

Number	Item	Parameter
1	Diameter/length of shield machine	6.450/8.000 m
2	Cutter disc device type/opening rate	Panel/36%
3	Cutting disc drive	Hydraulic slewing drive
4	Radius of the adaptive minimum curve	250 m
5	Maximum heading speed	8 cm/min
6	Number of thrust cylinders/maximum total thrust	16 sets of twin cylinders/42575 kN
7	Synchronous grouting system grouting pump	2
8	Grouting system cleaning loop	1
9	Shield tail seal/shield tail grease injection hole	3 rows of seal plate brushes/2 × 6
10	Soil pressure sensor/gate emergency closing device	5/1