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<p>The issue of TBM shield jamming in jointed rocks is a significant challenge in deep tunnel construction, especially with double shield and single shield TBMs. To realistically assess the potential for shield jamming in such grounds, a discrete fracture network-discrete element-finite difference (DFN-DE-FD) modelling approach is proposed for simulating double shield excavation in jointed rocks. The DFN model generates the stochastic joints in the jointed rocks, while the combined discrete element-finite difference (DE-FD) model helps reduce computational time and hardware resource requirements. To accurately model multiple fracture sets in jointed rock masses, a novel DFN generation technique was implemented using a FISH script developed within 3DEC. Furthermore, another FISH script was developed in 3DEC to simulate the continual TBM excavation and the TBM advance rate. The approach is demonstrated through the simulation of the third shield jamming in the DXL tunnel, excavated by a double shield TBM, to validate its applicability. The modelling results indicate that the proposed model is efficient for simulating DS TBM excavation in jointed rocks.</p>

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A DFN-DE-FD Modelling Approach for Simulating Double Shield TBM Excavation in Jointed Rocks

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Bo Sun,
  • Renkun Wang,
  • Yong Xia,
  • Yue Liu,
  • Tuan Zhang

摘要

The issue of TBM shield jamming in jointed rocks is a significant challenge in deep tunnel construction, especially with double shield and single shield TBMs. To realistically assess the potential for shield jamming in such grounds, a discrete fracture network-discrete element-finite difference (DFN-DE-FD) modelling approach is proposed for simulating double shield excavation in jointed rocks. The DFN model generates the stochastic joints in the jointed rocks, while the combined discrete element-finite difference (DE-FD) model helps reduce computational time and hardware resource requirements. To accurately model multiple fracture sets in jointed rock masses, a novel DFN generation technique was implemented using a FISH script developed within 3DEC. Furthermore, another FISH script was developed in 3DEC to simulate the continual TBM excavation and the TBM advance rate. The approach is demonstrated through the simulation of the third shield jamming in the DXL tunnel, excavated by a double shield TBM, to validate its applicability. The modelling results indicate that the proposed model is efficient for simulating DS TBM excavation in jointed rocks.