Research on the Control of Excavation Deformation of Super Deep Foundation Pit Adjacent to the Existing Old Masonry Structure Building

In order to ensure the safety and stability of existing old masonry structure houses in process dewatering excavation super deep foundation pit subway, support form a water stop curtain combined with bored cast-in-place piles internal is adopted, rotary jet grouting are constructed around houses, sleeve valve pipes embedded, soil house grouted strengthened. The deformation building analyzed by finite element method. results show that adjacent buildings mainly uniform at initial stage excavation. With increase depth, shows significant differential characteristics, maximum displacement settlement deformation. field monitoring data actual trend value range basically consistent calculation results, no new damage found during construction process. Effective method layer reinforcement can effectively reduce impact on buildings.