Deformation Response and Safety Evaluation of Buildings Affected by Subway‐Station Construction

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.

Numerical Analysis of the Influence of Deep Excavation on Nearby Pile Foundation Building

“…All structural elements of the above buildings are considered to be ideal elastic bodies [8]. Due to the elongated shape of the excavation pit, deformations along the long side of the pit are relatively complex [25,36]. Based on the actual engineering characteristics introduced in Section 2, the research in this paper considers the impact of different distances, angles, and floors between buildings and the excavation pit on the interaction between the building and the pit excavation.…”

“…The interactions between the upper structure of the building, the pile foundation, and the surrounding soil layers are comparatively complex, and this mechanism is much more intricate than that of shallow foundations. Currently, research on this topic has not been conducted in-depth [23][24][25]. Ding et al [24] investigated the influence of factors such as the number of building floors, types of building foundations, and the relative position between tunnels and buildings on the three-dimensional structural characteristics of neighboring buildings during tunnel excavation.…”

“…The results indicate that the type of building foundation has a significant impact on the deformation characteristics of the structures. Feng et al [25] considered factors such as the relative position between the excavation pit and buildings and the method of pit construction. They studied the mutual interactions between the excavation pit and neighboring buildings and established a multi-angle safety assessment method for evaluating the impact of excavation on neighboring structures.…”

Analysis of Deep Foundation Pit Pile-Anchor Supporting System Based on FLAC3D

“…Kim [39] carried out full-scale model tests on lowpressure grouting anchors in weathered soil, such as pullout resistance and stress relaxation, and obtained research results on the transmission mechanism of the anchor's axial force. Ding et al [40][41][42][43][44][45][46][47] used FLAC3D software to establish the numerical model of pile-anchor supporting structure of foundation pit and analyzed the influence of foundation pit excavation on adjacent buildings. Zhang et al [48] used FLAC3D software to analyze the pileanchor support of the deep foundation pit and obtained the stress deformation characteristics of the support structure and the deformation form of the surrounding soil.…”