Response Monitoring and Analysis in Deep Foundation Pit Excavation: A Case Study in Soft Soil at Subway Tunnel Intersections

With the rapid development of urban rail transit and underground space development, occurrence excavation near existing tunnels is becoming more common. This unloading will inevitably cause soil deformation outside pit tunnel buried therein. paper presents an investigation into entire process effects on adjacent subway structure under complex construction environments, including soft foundations intersections, based measured data construction. The horizontal vertical displacements deep soils in two pits were analyzed along with safety management measures to determine displacement curve pattern lateral distribution law soils. analysis shows that after excavation, undergoes “lateral expansion” “vertical compression” type deformation, accompanied by “in-pit” “settlement” displacement. Furthermore, a correlation reveals clear linear relationship between which can be used as prediction method for deformation. Finally, comparative relevant influence zone models formulas carried out monitoring. results this study have significant guiding implications vicinity crossings.