Application technique on thrust jacking pressure of shield TBM in the sharp curved tunnel alignment by model tests

A Geometric Model for a Shield TBM Steering Simulator

“…Kang et al [7] undertook a numerical simulation to evaluate the structural stability of the TBM shield during a tightly curved excavation, identifying the load transfer mechanism from articulation and shield jacks to the shield skin and the effect of load transfer on the structural stability of the shield skin.…”

“…However, the navigation system was considered in two-dimensional space. Further studies have also aided the understanding of the overall TBM steering system [7][8][9].…”

“…As there are no connected pins in the system, it is easy to rotate through any articulation angle in any direction. However, as the articulation angle increases, the gaps between shields also increase and it is difficult to prevent the inflow of muck and water during articulation [7][8][9]. As shown in Figure 1b, there are two types of thrust system: reaction force at the front shield and reaction force at the middle and tail shields.…”

“…As shown in Figure 1b, there are two types of thrust system: reaction force at the front shield and reaction force at the middle and tail shields. The latter is generally more appropriate for curved excavation; it can supply a constant thrust force to the segment ring without eccentric force, regardless of the rotation of the front shield [7][8][9].…”