Analysis of Driving Parameters of Shield Tunnel on Metro Section in Water-Bearing Sand Layer

Based on the construction of sectional tunnel from Genjia station to Longchuan Road station in the first phase of Harbin Rail Transit Line 2, relevant driving parameters were analyzed during the excavation of the shield tunnel in water-rich sandy stratum. The results showed that the main thrust of shield machine was controlled between 10-18 MN, the speed of cutter was about 1.3 r/min and the torque of cutter head is between 2-4 MN·m. The driving speed was kept within the range of 40-70 mm/min, while the earth pressure was mainly 0.1-0.2 MPa, and the average excavated volume was about 43 m³. Terzaghi Theory was used to calculate the earth pressure, by which the accuracy of the earth pressure monitoring results was verified accordingly.