Advanced finite element analysis of a complex deep excavation case history in Shanghai

doi:10.1007/s11709-014-0232-3

Front Struc Civil Eng

2014, Vol. 8

Issue (1) : 93-100 https://doi.org/10.1007/s11709-014-0232-3

RESEARCH ARTICLE

Advanced finite element analysis of a complex deep excavation case history in Shanghai

Yuepeng DONG¹(

), Harvey BURD¹, Guy HOULSBY¹, Yongmao HOU²

1. University of Oxford, Oxford OX1 2JD, UK; 2. Shanghai Tunnel Engineering Co LTD, Shanghai 200082, China

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Abstract

The construction of the North Square Shopping Center of the Shanghai South Railway Station is a large scale complex top-down deep excavation project. The excavation is adjacent to several current and newly planned Metro lines, and influenced by a neighboring Exchange Station excavation. The highly irregular geometry of this excavation greatly increases the complexity in 3D Finite Element modeling. The advanced numerical modeling described in this paper includes detailed structural and geotechnical behavior. Important features are considered in the analysis, e.g., 1) the small-strain stiffness of the soil, 2) the construction joints in the diaphragm wall, 3) the shrinkage in the concrete floor slabs and beams, 4) the complex construction sequences, and 5) the shape effect of the deep excavation. The numerical results agree well with the field data, and some valuable conclusions are generated.

Keywords advanced finite element analysis deep excavations case history small-strain stiffness

Corresponding Author(s): DONG Yuepeng,Email:yuepeng.dong@chch.ox.ac.uk

Issue Date: 05 March 2014

Cite this article:

Yuepeng DONG,Harvey BURD,Guy HOULSBY, et al. Advanced finite element analysis of a complex deep excavation case history in Shanghai[J]. Front Struc Civil Eng, 2014, 8(1): 93-100.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-014-0232-3
https://academic.hep.com.cn/fsce/EN/Y2014/V8/I1/93

Fig.1 The North Square excavation and instrumentation (plan view)

Fig.2 Geotechnical profile and soil properties (Notes: = unit weight, = water content, = plastic limit, = liquid limit, = void ratio, = compressive index, = field vane shear strength, = cohesive strength, = internal friction angle)

Fig.3 Sectional view of the excavation

Fig.4 Plan views of the top floor slab

Tab.1 Construction sequence

Fig.5 Mesh of the whole model (plan view)

Fig.6 Mesh of the retaining wall

Fig.7 Mesh of the supporting system

Fig.8 Multi yield surface model []

Fig.9 Normalized S-shaped curves

Fig.10 Wall deflections

Fig.11 Ground settlement along BC

Fig.12 Soil lateral deflection at IT10

Fig.13 Vertical displacement of the soil

Fig.14 Displacement of the diaphragm wall

Fig.15 Displacement of the supporting system

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