Study on the Monitoring Program and Data Analysis of Deep and Large Pits

With the rapid development of urban construction, modern foundation pits present increasing excavation depth and scale. Most pits are close to building red lines, characterized by complex surrounding environments and rigorous deformation control limits. Targeting the defects of conventional monitoring methods, this study optimizes equipment layout and monitoring technologies based on the Vanke Nanbeikang B-6 project, and proposes an improved monitoring scheme for deep and large foundation pits. Monitoring results reveal that the maximum horizontal displacement at the pit top is 25.20 mm, and the maximum deep horizontal displacement reaches 26.18 mm at a depth of 17.0 m. Field verification indicates that the proposed scheme can quantify foundation pit deformation with measured data and guide dynamic construction adjustment. Through analysis of field deformation data, an efficient monitoring system is established and reasonable deformation control indicators are determined. The research results can provide technical references for similar foundation pit excavation projects.