The design to foundation pit sectional supporting and analysis to the deformation monitoring

Based upon the bracing engineering of a deep foundation pit in Changchun,the design for foundation pit supporting system and deformation monitoring are discussed and analyzed.According to the complexity of the surroundings,subsection design is adopted.Near the side of existing buildings and roads,there are three forms of supporting respectively:pile-anchor bracing,composite soil nailing wall with micro pile and soil nailing and prestress anchorage cable,and soil nail wall supporting.From the perspective of excavation monitoring,it monitors the top horizontal displacement of retaining structure,observes the x-offset and subsidence of the surrounding buildings,and monitors the displacement of deep soil.By analyzing the monitoring results,it proves that the composite soil nail wall can control the deformation effectively except for the condition of rapid excavation.By monitoring,the dangers of supporting structure are timely treated,avoiding the accident and effectively proving the necessity of the foundation pit monitoring.