Performance of a top-down excavation in shanghai: case study and numerical exploration

Yang, Zhenkun; Chen, Youliang; Azzam, Rafig; Yan, Chao

doi:10.1080/19648189.2021.2013950

Cited by 10 publications

(6 citation statements)

References 31 publications

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“…Typical characteristics of trough settlements are that the maximum settlements occur at a certain distance behind the wall, and the settlements gradually decrease to zero with increasing distance to the wall. According to previous studies [14,18,21,23,47], ground settlements caused by triangle-type wall movements and parabolic-type wall movements are in accordance with realistic responses of the ground to deep excavations.…”

Section: Distribution Patterns Of Ground Surface Settlement Under Dif...supporting

confidence: 73%

“…In recent years, emphasis has been placed on the study of responses of existing properties to deep excavations. Several commonly used techniques to investigate deformation behaviors and the corresponding environmental effects of braced excavations are FEM analyses based on numerical tools [11][12][13][14][15][16], empirical/semiempirical methods based on field measurements [17][18][19][20][21][22]; or a published database [23][24][25][26], analytical solutions [27][28][29][30][31][32], and model tests [33,34]. In addition, machine learning (ML), artificial intelligence (AI), and artificial neural network (ANN) algorithms are becoming increasingly accurate and reliable in predicting elastic fields of soil around retaining walls under various scenarios of wall movements [35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

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Analytical Solution for the Deformation of Pipe Galleries Adjacent to Deep Excavation

Xiang,

Liu,

Cui

et al. 2024

Buildings

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Deep excavations clearly impact adjacent existing properties and threaten their operational safety. Predicting the deformation of existing infrastructure induced by nearby underground construction is the main concern of urban underground development. This paper presents an analytical calculation method for predicting underground pipe gallery deformations induced by adjacent deep excavations. First, the authors assume the existing pipe gallery to be nonexistent in the soil and propose a solution to calculate the excavation-induced vertical movements of the soil at the position of the existing pipe gallery. Thereafter, the authors simplify the existing pipe gallery as an elastic beam on a Winkler foundation to calculate its deformation. Finally, the method is verified by the good agreement found between the calculated result and the field measurement of the construction of the Shanghai Hongqiao CBD project. The proposed analytical method of this work can provide accurate evaluation results for similar engineering projects.

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Section: Distribution Patterns Of Ground Surface Settlement Under Dif...supporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Analytical Solution for the Deformation of Pipe Galleries Adjacent to Deep Excavation

Xiang,

Liu,

Cui

et al. 2024

Buildings

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“…In order to make clear this influence, a further parametric study concerning the soil-wall contact was conducted. According to a previous study [14], the value range of ultimate side friction of cast-in-place piles is 15 kPa~100 kPa. In the current parametric study, a domain of 5 kPa~100 kPa for the values of τ max is considered.…”

Section: Influence Of the Shear Stress Limit τ Maxmentioning

confidence: 92%

“…Several approaches are generally used to conduct deformation analyses of deep excavations: simplified theoretical analyses (e.g., linear-and elastic-based close form approach, beam-spring approach, and limit equilibrium method), empirical/semi-empirical methods [3][4][5][6][7], laboratory tests [8][9][10][11][12], and numerical approaches [13][14][15]. Simplified theoretical methods are generally used to provide some basic understanding of the performance of deep excavations during the design, but they have many limitations because they are oversimplified [16].…”

Section: Introductionmentioning

confidence: 99%

Parametric Study of the Deep Excavation Performance of Underground Pumping Station Based on Numerical Method

Zhang,

Yang,

Azzam

2024

Buildings

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Environmental responses to deep excavations are combined results of numerous factors. The effects of some factors are relatively straightforward and can be considered carefully during the design. On the other hand, more features impact excavation-induced performances indirectly, making their influences difficult to be clearly understood. Unfortunately, the complexity and non-repeatability of practical projects make it impossible to thoroughly understand these issues through realistic deep excavation projects. Therefore, parametric studies based on repeatable laboratory and numerical tests are desired to investigate these issues further. This work examines the influence of several key features on excavation-induced displacements through a series of 3D numerical tests. The study includes the choice of soil constitutive models, the modeling method of the soil–wall interface, and the influences of various key soil parameters. The comparison shows that the MCC model can yield a displacement field similar to the HSS model, while its soil movement is greatly improved compared to the MC model. Both the soil–wall interface properties and soil parameters impact the excavation-induced displacement to a large extent. In addition, the influence mechanisms of these parameters are analyzed, and practical suggestions are given. The findings of this paper are expected to provide practical references to the design and construction of future deep excavation projects.

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“…In order to evaluate the potential negative impacts of this type of work on neighboring buildings, it is necessary to evaluate the displacements that occur as a result of deep excavation. The aforementioned can be carried out using empirical and semi-empirical methods, laboratory tests, analytical methods and numerical simulations (Yang et al 2021). With the development of computers, the finite element method (FEM) is becoming one of the most widely used methods in geotechnical analyses of deep excavations (Chen et al 2022).…”

Section: Introductionmentioning

confidence: 99%

An example of the protection of a deep excavation in an urban environment

et al. 2022

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The paper presents the design of deep excavation support system in an urban environment. Excavation is carried out in the vicinity of surrounding buildings whose structural stability must be ensured during the execution of the construction works. The 60 cm thick diaphragm wall supported by the two rows (17.00 m and 18.25) of geotechnical anchors was selected as an excavation support system. The approximate floor plan dimensions of the diaphragm wall are 81x118 m, and the maximum excavation depth is 10.5 m. An additional challenge in designing the diaphragm wall is the presence of groundwater, whose maximum level is observed at a depth of approximately 5.8 m. In order to ensure the execution of construction works in dry conditions, a system of drainage trenches and wells is designed at the bottom of the pit. The diaphragm wall is designed in accordance with Eurocode 7.

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Performance of a top-down excavation in shanghai: case study and numerical exploration

Cited by 10 publications

References 31 publications

Analytical Solution for the Deformation of Pipe Galleries Adjacent to Deep Excavation

Analytical Solution for the Deformation of Pipe Galleries Adjacent to Deep Excavation

Parametric Study of the Deep Excavation Performance of Underground Pumping Station Based on Numerical Method

An example of the protection of a deep excavation in an urban environment

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