Table 1 Specification of TBM used in the Nepal Himalaya.

From: Machine learning approach for prediction of TBM performance and risk of jamming in Himalayan geology using a cross-project tunnelling database

TBM features

BBDM project

SMDM project

TBM Type

Double shield

Double shield

Excavation diameter (m)

5.06

6.40

Total length of machine (m)

274

274

Cutterhead speed (rpm)

0–11.4.4

0–11.4.4

Rated torque (kNm)

3475

4054

Break out torque (kNm)

5733

6081

Maximum thrust (kN)

20,826

31,220

Number of 17-inch disc cutters

33

41

Power of main drive (kW)

6*330 = 1980

7*330 = 2310

Total power (kW)

3027

3513

Back to article page