Study on the restraint control of an isolation pile on an existing high-speed railway during the close passing of a shield machine

The impact of shield construction on the close lateral passing high-speed railways can threaten safety operating railways. To study deformation characteristics structure after application isolation piles from ground surface and bridge piers an overpassing railway, we analyze mechanism pile restraint control establish a three-dimensional numerical model to situation railway with metro interval under passenger line project. Combined measured data simulation same stage, surrounding in terms disturbance changes effect isolation, as well tunnel area deformation. results show that block development soil layer rupture stress path. has good vertical displacement pier. pier decreases 0.6 mm 1.1 single- double-track tunneling, along depth direction non-uniform relatively uniform. includes both uplift settlement, which occur at time. When tunneling advances, form settlement trough is changed “V” shape formed by right single-track “W” tunneling. effectively influence range excavation; its regularly, always “double-C outward expansion” shape. initial excavation greatly disturbs field, so it necessary pay attention management measures destroy field.