Three-Dimensional Finite Element Analysis of Deep Excavations

Ou, Chang‐Yu; Chiou, D. Y.; Wu, Tzong-Shiann

doi:10.1061/(asce)0733-9410(1996)122:5(337)

Cited by 183 publications

(84 citation statements)

References 10 publications

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“…This result is similar to the previous study of Ou et al (1996) for excavations in clays. However, for B/L more than 1.0, PSR is smaller than in sand rather than in clay.…”

Section: Conslusionsupporting

confidence: 92%

“…The PSR value (Ou et al, 1996), which is based on excavations in clays, is also not able to well estimate the maximum wall deflections. The maximum wall deflections predicted from the PSR value (this study) are very close to those obtained from 3D finite element analysis (3D FEA).…”

Section: Application Of Psrmentioning

confidence: 99%

“…The wall deflections have been studied by many researches such as Clough and O'Rourke (1990), Ou et al (1996) Likitlersuang et al (2013) and Khoiri and Ou (2013). However, most of these researches mainly focused excavations in clays, not in sands.…”

Section: Introductionmentioning

confidence: 99%

“…However, most of these researches mainly focused excavations in clays, not in sands. In the study of Ou et al (1996), a concept of plane strain ratio (PSR) was first proposed, which is the ratio of the maximum wall deflection of a certain section along the wall to the maximum wall deflection of the section under the plane strain condition. The PSR values were also determined and evaluated for a typical excavation in condition of clayey soils in Taipei, Taiwan.…”

Section: Introductionmentioning

confidence: 99%

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Impacts from three-dimensional effect on the wall deflection induced by a deep excavation in Kaohsiung, Taiwan

Hsiung

Dao

2016

JGS Special Publication

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In this paper, it aims to examine impacts from three-dimensional effect on the wall deflection induced by a deep excavation in Kaohsiung city, Taiwan. The commercial software PLAXIS 3D was used as a numerical tool for 3D finite element analyses in this study. First, a benchmark analysis was performed to simulate a case history of deep excavation in thick layers of sand (Case A) to verify the performance of 3D numerical analysis model in predicting the wall displacements. It is aware that there is a little limitation in prediction of the wall movements by using a constitutive soil model having single elastic modulus. Next, a series of parametric studies that uses the same input parameters as the benchmark analysis was conducted to model the excavation of Case A with various values of excavation length (L) and width (B). From these parametric studies, plane strain ratio (PSR), which is the ratio of the maximum wall deflection of a certain section to the maximum wall deflection of the section under the plane strain condition, was determined with various values of distance from evaluated section to the excavation corner (d), length (L) and width (B) of excavation. A relationship between PSR, d and ratio of B/L was thus interpreted. It is summarized that PSR is smaller than in sand rather than in clay for B/L more than 1.0, but it is larger than in sand rather than in clay for B/L less than 0.5. Further verification may have to be delivered later in order to explore the reason for the difference.

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“…This result is similar to the previous study of Ou et al (1996) for excavations in clays. However, for B/L more than 1.0, PSR is smaller than in sand rather than in clay.…”

Section: Conslusionsupporting

confidence: 92%

Section: Application Of Psrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Impacts from three-dimensional effect on the wall deflection induced by a deep excavation in Kaohsiung, Taiwan

Hsiung

Dao

2016

JGS Special Publication

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“…There are common methods to predict the expected movements, like empirical correlation with case histories of deep excavation pits [1,2] or numerical calculation of the retaining walls especially in urban areas [3,4]. The finite element method, in conjunction with adequate constitutive soil models, is a powerful tool to calculate ground deformations which arise during the stepwise excavation of a pit.…”

Section: Introductionmentioning

confidence: 99%

Modelling of earth and water pressure development during diaphragm wall construction in soft clay

Schäfer

Triantafyllidis

2004

Num Anal Meth Geomechanics

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SUMMARYThe influence of a diaphragm wall construction on the stress field in a soft clayey soil is investigated by the use of a three-dimensional FE-model of seven adjacent wall panels. The installation procedure comprises the excavation and the subsequent pouring of each panel taking into account the increasing stiffness of the placed fresh concrete. The soft clay deposit is described by a visco-hypoplastic constitutive model considering the rheological properties and the small-strain stiffness of the soil. The construction process considerably affects the effective earth and pore water pressures adjacent to the wall. Due to concreting, a high excess pore water pressure arises, which dissipates during the following construction steps. The earth pressure finally shows an oscillating, distinct three-dimensional distribution along the retaining wall which depends on the installation sequence of the panels and the difference between the fresh concrete pressure and the total horizontal earth pressure at rest. In comparison to FE-calculations adopting the earth pressure at rest as initial condition, greater wall deflections and surface ground settlements during the subsequent pit excavation can be expected, as the average stress level especially in the upper half of the wall is increased by the construction procedure of the retaining structure.

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Comparative study of the effects of three data‐interpretation methodologies on the performance of geotechnical back analysis

Wang

Goh

Koh

et al. 2020

Num Anal Meth Geomechanics

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Summary Back analysis can provide engineers with important information for better decision‐making. Over the years, research on back analysis has focused mainly on optimisation techniques, while comparative studies of data‐interpretation methodologies have seldom been reported. This paper examines the use of three data‐interpretation methodologies on the performance of geotechnical back analysis. In general, there are two types of approaches for interpreting model predictions using field measurements, deterministic versus population‐based, both of which are considered in this study. The methodologies that are compared are (a) error‐domain model falsification (EDMF), (b) Bayesian model updating and (c) residual minimisation. Back analyses of an excavation case history in Singapore using the three methodologies indicate that each has strengths and limitations. Residual minimisation, though easy to implement, shows limited capabilities of interpreting measurement data with large uncertainty errors. EDMF provides robustness against incomplete information of the correlation structure. This is achieved at the expense of precision, as EDMF yields wider confidence intervals of the identified parameter values and predicted quantities compared with Bayesian model updating. In this regard, a modified EDMF implementation is proposed, which can improve upon the limitations of the traditional EDMF method, thus enhancing the quality of the identification outcomes.

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Three-Dimensional Finite Element Analysis of Deep Excavations

Cited by 183 publications

References 10 publications

Impacts from three-dimensional effect on the wall deflection induced by a deep excavation in Kaohsiung, Taiwan

Impacts from three-dimensional effect on the wall deflection induced by a deep excavation in Kaohsiung, Taiwan

Modelling of earth and water pressure development during diaphragm wall construction in soft clay

Comparative study of the effects of three data‐interpretation methodologies on the performance of geotechnical back analysis

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