During the construction of shie ld tunnels，support pressure is usually applied at the work face to prevent <EO<x D=:
excessive tunneling—induced soil movement or collapse．However，the selection and control of appropriate support
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pressure is difficult due to variation of soil conditions and uncerlainty in construction．Support pressure should be N6Z{BLZ
controlled SO that it is not SO low as to cause face collapse and not SO high as to induce ground hogging．Numerical ;,O fJ'q^
simulation is employed to study how the soil parameter and ground water affect the support pressure，and to give the qO`qJ /
proper support pressure at the excavation face in a case study． PKq-@F%X
Keywords：shield tunnel；excavati‘on face；numerical solution；support pressure
