Journal of Northeastern University(Natural Science) ›› 2025, Vol. 46 ›› Issue (11): 115-124.DOI: 10.12068/j.issn.1005-3026.2025.20240242

• Resources & Civil Engineering • Previous Articles     Next Articles

Numerical Simulation on Tunneling Parameter Optimization of Shield Machine in Cutting Obstacle Piles in Existing Stations

Peng JIA1(), Bin-yu SUN1, Li ZHU2, Li-min SONG2   

  1. 1.School of Resources & Civil Engineering,Northeastern University,Shenyang 110819,China
    2.The Fourth Engineering Co. ,Ltd. ,China Railway Third Bureau Group,Beijing 102300,China.
  • Received:2024-12-31 Online:2025-11-15 Published:2026-02-07
  • Contact: Peng JIA

Abstract:

When the shield machine encounters obstacle piles while tunneling beneath an existing station, it often needs to directly cut through the piles. During this process, the control of the shield machine’s tunneling parameters is crucial for ensuring the safety and stability of the existing upper structure. For the pile-cutting construction of the Shenyang Metro passing beneath existing stations, ABAQUS finite element numerical simulation software was used to simulate the dynamic cutting process of the cutterhead through the obstacle piles. The results show that during the pile-cutting process, whether the shield machine is advancing towards or away from the station, both the field penetration index (FPI) and the tunneling specific energy increase with the advancing speed. The length of the rebar cut during the pile-cutting process also increases with the advancing speed and cutterhead rotation speed. When the advancing speed is less than 0.35 mm/s, the number of rebars with lengths shorter than 350 mm is relatively high. However, when the cutterhead rotation speed exceeds 0.140 rad/s, the number of long rebars increases significantly. As the advancing speed increases, the disturbance degree to the surrounding piles also increases, and the disturbance degree notably increases when the advancing speed exceeds 0.4 mm/s.

Key words: shield tunneling, dynamic pile-cutting, rebar cutting, tunneling specific energy, stress disturbance degree

CLC Number: