Fig 1.
Screw conveyor in the EPB shield machine (from http://cn.herrenknecht.com/cn).
Fig 2.
Schematic view of the screw conveyor structure.
Fig 3.
The definition of the helical angle.
Fig 4.
The studied object.
Fig 5.
The size of the soil microbody.
Fig 6.
The forces acted on the soil microbody.
Fig 7.
The movement of the soil microbody.
Fig 8.
The velocity vector between the soil microbody and the blade.
Fig 9.
Screw conveyor model machine.
Table 1.
Parameters of the model screw conveyor.
Table 2.
Geotechnical indices of standard sand.
Fig 10.
The slump tests of composite additive conditioning soil.
(A) Only 15% bentonite slurry. (B) 15% bentonite slurry with 10% foam solution. (C) 15% bentonite slurry with 20% foam solution. (D) 15% bentonite slurry with 30% foam solution. (E) 15% bentonite slurry with 40% foam solution. (F) 15% bentonite slurry with 50% foam solution.
Fig 11.
Slumps under different additive injection ratios.
Fig 12.
Driving torque schedule.
Fig 13.
Shear stress of testing point 1.
Fig 14.
Shear stress of testing point 2.
Fig 15.
Shear stress of testing point 3.
Fig 16.
Shear stress of testing point 4.
Fig 17.
Shear stress of testing point 5.
Fig 18.
Shear stress of testing point 6.
Fig 19.
Fitting residuals at each measuring point.
Fig 20.
Comparison of the mean theoretical value and linear fitting value.