During the construction of shie ld tunnels，support pressure is usually applied at the work face to prevent x q93>Hs
excessive tunneling—induced soil movement or collapse．However，the selection and control of appropriate support @]f"X>
pressure is difficult due to variation of soil conditions and uncerlainty in construction．Support pressure should be !x. ^ya
controlled SO that it is not SO low as to cause face collapse and not SO high as to induce ground hogging．Numerical "r0z( j
simulation is employed to study how the soil parameter and ground water affect the support pressure，and to give the zx\N^R;Jq
proper support pressure at the excavation face in a case study． )>,b>7
Keywords：shield tunnel；excavati‘on face；numerical solution；support pressure
