Abstract
Based on the sand and pebble stratum in the Beijing area, this paper studies the interaction between deep-foundation-pit excavation for subway stations and surrounding buildings using an orthogonal test. Moreover, it considers the relative position relationship between buildings and how the foundation pit is set up as well as different design schemes for foundation pits and the surrounding buildings. Results show that the horizontal distance s between the building and foundation pit and stiffness of the building itself have a clear impact on the differential settlement δij and relative deflection Δ, and the degree of deformation of the building near the corner of the foundation pit is complex. Simultaneously, based on numerical simulation results, the deformation characteristics and degree of deformation of the building under different relative position relationships with the foundation pit are analyzed. Finally, by establishing a relationship among the comprehensive deformation index Dj, surrounding environmental safety evaluation index Sj, and scheme safety grade Lj, a multiangle safety evaluation method for buildings affected by foundation-pit construction is formed, which can provide a reference for the research and design of similar projects.
Highlights
Deep-foundation-pit engineering is accompanied by different degrees of environmental impact in construction processes, which causes a change in the stress field of surrounding soil, resulting in foundation soil deformation within a certain range that affects surrounding buildings and structures
If foundation-pit excavation deformation is not properly controlled, it can threaten the safety of the surrounding environment because the deformation of the surrounding soil leads to uneven settlement or even damage caused by cracking in the building and structure, and the building can no longer be used for its normal purpose
The excessive settlement of the adjacent buildings exacerbates the deformation of the surrounding soil, which may lead to a further increase in the deformation of the retaining structure
Summary
Deep-foundation-pit engineering is accompanied by different degrees of environmental impact in construction processes, which causes a change in the stress field of surrounding soil, resulting in foundation soil deformation within a certain range that affects surrounding buildings and structures. If foundation-pit excavation deformation is not properly controlled, it can threaten the safety of the surrounding environment because the deformation of the surrounding soil leads to uneven settlement or even damage caused by cracking in the building and structure, and the building can no longer be used for its normal purpose. At present, existing research on the environmental response of deep-foundation-pit excavation mostly focuses on the influence of foundation-pit deformation on surrounding structures, including actual deformation statistics [2,3,4] and numerical simulations and model test [5,6,7]. A comprehensive evaluation method for the influence of multiangle foundation-pit excavations on surrounding buildings was developed, which provides a reference for subsequent related research and design
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