Centrifuge Model Tests on Double Propped Wall Excavation in Soft Clay

Takemura, Jiro; Kondoh, Midori; Esaki, Taichi; Kouda, Masayuki; Kusakabe, Osamu

doi:10.3208/sandf.39.3_75

Cited by 53 publications

(19 citation statements)

References 8 publications

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“…Draining it simulates excavation. Coefficient of lateral stress is always 1.0 Kimuara et al (1993); Loh et al (1998); Takemura et al (1999) in-flight excavator…”

Section: = C U / Mobmentioning

confidence: 99%

Ground movements due to deep excavations in Shanghai: Design charts

Bolton

Lam²,

Vardanega

et al. 2014

Front. Struct. Civ. Eng.

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms Abstract: Recent research has clarified the sequence of ground deformation mechanisms that manifest themselves when excavations are made in soft ground. Furthermore, a new framework to describe the deformability of clays in the working stress range has been devised using a large database of previously published soil tests. This paper aims to capitalize on these advances, by analyzing an expanded database of ground movements associated with braced excavations in Shanghai. It is shown that conventional design charts fail to take account either of the characteristics of soil deformability or the relevant deformation mechanisms, and therefore introduce significant scatter. A new method of presentation is found which provides a set of design charts that clarify the influence of soil deformability, wall stiffness, and the geometry of the excavation in relation to the depth of soft ground.

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“…Draining it simulates excavation. Coefficient of lateral stress is always 1.0 Kimuara et al (1993); Loh et al (1998); Takemura et al (1999) in-flight excavator…”

Section: = C U / Mobmentioning

confidence: 99%

Ground movements due to deep excavations in Shanghai: Design charts

Bolton

Lam²,

Vardanega

et al. 2014

Front. Struct. Civ. Eng.

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“…In the same context, Schurmann and Jesberger have performed centrifuged tests to study the pressure profiles developed on a sheet piling driven into dry sand during excavation [11]. In the same period, a qualitative step forward was given to this technique and mainly relates to the first excavator device operating during flight for studying centrifuged excavations models developed by Kimura et al; [12].This tool was used in other studies including those conducted by Takemura et al, [13]. During the year 1998, it became possible to study the three dimensional behavior of structure as done by Loh et al, to observe the behavior of two free standing retaining walls, stuck in a reconsolidated kaolin clay [14].…”

Section: Historical Overviewmentioning

confidence: 99%

Parametric and Comparative Study of a Flexible Retaining Wall

Chogueur¹,

Zadjaoui²

2017

Period. Polytech. Civil Eng.

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IntroductionThe design of retaining walls in day-to-day practice is currently based on different calculation methods. If classical methods considering specific modes of failure, the elastic line and the equivalent beam are still employed for certain types of walls, it is mainly the subgrade reaction and the numerical methods which are most frequently adopted. The subgrade reaction method or spring method is rather well mastered and uncertainties mainly rely in the choice of the coefficient of subgrade reaction [1], [2]. The numerical methods have the advantage of taking into account more accurately the soil behavior, the soil-wall interface and also the ability to consider multiple hydraulic conditions and various options for modeling support conditions. However, the results obtained by these methods still require to be validated by engineer judgment or others experimental results (physical model in centrifuge for example) or measured in-situ. The main objectives of this study were to define the influence factors of the commonly used design methods and the resulting uncertainties encountered by the practitioners. This paper focuses on numerical modeling and analysis the behavior of a free standing diaphragm wall, made of reinforced concrete, embedded in sand, by the subgrade reaction method using the K-Rea software and by the numerical method based on finite elements with Plaxis 2D-v8.5 software. For both methods, different simulations have been performed with non-loaded supported soil. For the first method, we are interested in analyzing the influence of the main factors affecting soil movement and instability of the retaining wall. These factors mainly concern the wall rigidity, the construction sequence and mechanical parameters of the soil. One key step of this method is the difficulty in evaluating the coefficient of subgrade reaction Kh on a rational basis. Concerning the finite element method, the soil is homogeneous and dry; its behavior is described by linear elastic perfectly plastic model Mohr-Coulomb (MC) and nonlinear hardening soil model (HSM). The diaphragm wall is modeled by "beam" elements. The simulations were performed with different mesh sizes and reduction factors of the soil-wall interface. For both methods, the analyses are focuses on wall deformation,

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“…6. Once the whole model preparation was completed, the model was placed on a centrifuge platform and spun up to 50 g using the Mark III centrifuge at the Tokyo Institute of Technology (Takemura et al, 1999). Hereafter, the data of the displacements are presented in the model scale unless otherwise stated.…”

Section: Model and Test Descriptionsmentioning

confidence: 99%

Observed Behaviour of a Tunnel in Sand Subjected to Shear Deformation in a Centrifuge

Shibayama

Izawa

Takahashi

et al. 2010

Soils and Foundations

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The paper describes observed behaviour of a model tunnel embedded in dry sand subjected to cyclic ground shear deformation in a centrifuge, as well as the behaviour of the model ground during shear deformation. Detailed data on earth pressures acting on the tunnel lining and the sectional forces of the lining are presented during ground shear deformation. The data suggest that the earth pressure at tunnel crown before ground shear deformation is smaller than the full overburden pressure probably due to the formation of arch action and the arch action may deteriorate with the cyclic ground shear deformation, resulting in an increase in the earth pressure at crown and changing the distribution of the sectional forces, which are largely in‰uenced by conditions between tunnel lining and invert.

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Centrifuge Model Tests on Double Propped Wall Excavation in Soft Clay

Cited by 53 publications

References 8 publications

Ground movements due to deep excavations in Shanghai: Design charts

Ground movements due to deep excavations in Shanghai: Design charts

Parametric and Comparative Study of a Flexible Retaining Wall

Observed Behaviour of a Tunnel in Sand Subjected to Shear Deformation in a Centrifuge

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