Interaction between a large-scale triangular excavation and adjacent structures in Shanghai soft clay

Shi, Jiangwei; Liu, Guobin; Huang, Pei Yan; Ng, Charles Wang Wai

doi:10.1016/j.tust.2015.07.013

Cited by 80 publications

(17 citation statements)

References 28 publications

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“…Sun et al [7] and Xu et al [8] investigated the relationship between deformation in foundation pit excavation and the geometric shape of the foundation pit. e effect of foundation pit excavation on the surrounding environment was examined by Tan and Wei [9] and Shi et al [10].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Axial Force Compensation and Deformation Control Effect of Servo Steel Struts in a Deep Foundation Pit Excavation in Soft Clay

Guo

Zhou

et al. 2019

Advances in Civil Engineering

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This study presents a comparative analysis of the deformation control effect of the hydraulic servo steel struts and ordinary steel struts of a foundation pit based on the measured axial force of the steel struts, lateral wall deflection, and ground surface settlement due to pit excavation. The results indicate that ordinary steel struts installed via axial preloading exhibit a disadvantageous axial force loss with a maximum value equal to 86.7% of the axial preloading force. When compared with ordinary steel struts, the hydraulic servo steel strut exhibits a superior supporting effect. The hydraulic servo steel strut adjusts the axial force in real time based on the deformation of the retaining structure and the axial force of the struts. Thus, the ratio of maximum lateral deflection to the excavation depth of a deep foundation pit in soft soil is less than 0.3%. Concrete struts undergo unsupported exposure during the excavation process, leading to sharply increasing deformation of the retaining structure. Therefore, regarding a foundation pit with strict requirements for deformation control, the use of hydraulic servo steel struts rather than concrete struts is recommended.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Axial Force Compensation and Deformation Control Effect of Servo Steel Struts in a Deep Foundation Pit Excavation in Soft Clay

Guo

Zhou

et al. 2019

Advances in Civil Engineering

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“…At present, scholars have studied the effects of adjacent construction on existing tunnels through various approaches such as field observations, numerical analyses, and theoretical derivations, and have obtained useful conclusions. Based on field observations, He et al [1], Simpson et al [2], Shi et al [3], Chen et al [4] and Chen et al [5] obtained the deformation laws of existing tunnels during adjacent tunnelling progresses and provided control recommendations. However, the observed deformation laws notably vary due to engineering designs, stratum environments, construction modes and other factors.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal Deformation of Deep Shield Tunnels Caused by Upper Load Reduction

Zheng

et al. 2021

Materials

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Above-crossing excavations may cause uplift damages on existing shield tunnels. Therefore, to accurately calculate the deformation of shield tunnels is very necessary for geotechnical engineers. At present, the single-sided elastic foundation beam model is usually used in longitudinal deformation calculations for shield tunnels, which overestimates the uplift of deep shield tunnels. Because of the existence of the ground arch, deep shield tunnels are subjected to two-sided foundation reaction forces. Therefore, this paper proposes a partial missing double-sided elastic foundation beam model and the related fourth-order partial differential equations. In this model, the shield tunnel is subjected to double Winkler foundation springs and is simply considered a Euler–Bernoulli beam. A two-stage analysis method is used to solve the problem. First, the vertical unloading stress due to the above-crossing tunnelling at the tunnel location is calculated through Mindlin’s solution. Second, the deformation response of the beam subjected to an unloading stress is calculated by the finite difference method. Two engineering cases are used to verify the research. The results indicate that the proposed model is more accurate than traditional models in predicting the maximum uplift value, which is basically consistent with the observations. Due to the existence of segment staggering, the longitudinal influence range of the calculation by two models is larger than the actual measurement.

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“…Deep basements for underground facilities such as subway stations are usually excavated near existing buildings and bridges. Basement excavation-induced stress relief and ground movements inevitably cause additional deformation and stress on adjacent pile foundations [2,3]. It is highly likely that excavation-induced ground movement and stress relief may lead to severe damage and might result in collapse of structure.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Multipropped Deep Excavation‐Induced Ground Movements on Adjacent High‐Rise Building Founded on Piled Raft in Sand

Soomro

Mangi

Cheng

et al. 2020

Advances in Civil Engineering

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In this paper, a three-dimensional numerical parametric study was conducted to predict the deformation mechanism of a 20-storey building sitting on a (4 × 4) piled raft to an adjacent 25 m deep basement excavation. The influences of different excavation depths were investigated. An advanced hypoplastic sand model (which is capable of taking small-strain stiffness into account) was adopted to capture soil behaviour. The computed results revealed that excavation adjacent to a building resting on the piled raft caused significant settlement, differential settlement, lateral deflection, and interstorey drift in the building. With settlement due to working load (i.e., 4.8dp%), the total settlements of the building (7.8dp%) exceed the maximum allowable foundation settlement (i.e., 50 mm). In addition, substantial bending moment, shear forces, and changes in axial load distribution along pile length were induced. The findings from this study revealed that the building and pile responses are significantly influenced by the excavation depth.

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Interaction between a large-scale triangular excavation and adjacent structures in Shanghai soft clay

Cited by 80 publications

References 28 publications

Investigation of the Axial Force Compensation and Deformation Control Effect of Servo Steel Struts in a Deep Foundation Pit Excavation in Soft Clay

Investigation of the Axial Force Compensation and Deformation Control Effect of Servo Steel Struts in a Deep Foundation Pit Excavation in Soft Clay

Longitudinal Deformation of Deep Shield Tunnels Caused by Upper Load Reduction

The Effects of Multipropped Deep Excavation‐Induced Ground Movements on Adjacent High‐Rise Building Founded on Piled Raft in Sand

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