Ground Settlement of High-Permeability Sand Layer Induced by Shield Tunneling: A Case Study under the Guidance of DBN

Table 6

Summary of construction parameters.

Influence factors	Section/rings
	0~50	50~150
Soil pressure (bar)	1~1.3	1.3
Jack thrust (kN)	12000~18000	16000~24000
Cutter head torque (kN·m)	5000~6000	7500~8500
Tunneling speed (mm/min)	20~30	25~35
Grouting volume (m^3)	4.5~6.0	4.5~6.0
Grouting pressure (bar)	2~3	3~4
Permeability coefficient (cm·s)
Slurry density (g/cm^3)	1.32	1.32