During the construction of shie ld tunnels，support pressure is usually applied at the work face to prevent bDxPgb7N=
excessive tunneling—induced soil movement or collapse．However，the selection and control of appropriate support D 86 K$IT
pressure is difficult due to variation of soil conditions and uncerlainty in construction．Support pressure should be ]%b0[7[
controlled SO that it is not SO low as to cause face collapse and not SO high as to induce ground hogging．Numerical lv*Wnn@k
simulation is employed to study how the soil parameter and ground water affect the support pressure，and to give the }Ox2olUX
proper support pressure at the excavation face in a case study． O<gP)ZW~
Keywords：shield tunnel；excavati‘on face；numerical solution；support pressure
