Table 2 Results of real-time tunneling excavation parameters of double shield TBM.

From: Study on correlation between TBM tailings gradation and granitic gneiss surrounding rock stability

Parameter index

Penetration (mm/rot)

Torque (MN m)

Shoe pressure (bar)

Shoe displacement (mm)

Data range

5.60–7.80

2.60–2.85

156.00–158.00

287.00–289.00