During the construction of shie ld tunnels，support pressure is usually applied at the work face to prevent 7TCY$RcF,I
excessive tunneling—induced soil movement or collapse．However，the selection and control of appropriate support E? >
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pressure is difficult due to variation of soil conditions and uncerlainty in construction．Support pressure should be uY]nqb
controlled SO that it is not SO low as to cause face collapse and not SO high as to induce ground hogging．Numerical w}= "}Cb
simulation is employed to study how the soil parameter and ground water affect the support pressure，and to give the 69)- )en
proper support pressure at the excavation face in a case study． aiP.\`>}
Keywords：shield tunnel；excavati‘on face；numerical solution；support pressure
