A Discrete Numerical Approach for Modelling Face Stability in Slurry Shield Tunnelling

摘要

In this paper, a numerical simulation method for evaluating tun-nelling-induced ground movement is presented. The method involves discrete element simulation of TBM slurry shield advancement and considers explicitly soil excavation from the face, effects of varying face support pressure, and the influence of tunnel cover depth. For the cases studied, it is found that for tunnel cover depths (C/D) between 0.7~2.1, ground deformations inducing by the tunnelling is negligible and tunnel face stability can ensured, provided the support pressure ratio (N) lies between 0.8~1.5.