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Blanc, M. (author), Rault, G. (author), Thorel, L. (author), Almeida, M.S.S. (author), Almeida, M.C.F. (author)
Reinforcing compressible soils by rigid inclusions is a method to reduce and homogenize settlements under many types of structures. A granular mattress, located between the structure and the group of piles, transfers part of the loads on the surface to the head of the piles anchored in rigid substrate. An experimental device, a mobile tray, has...
conference paper 2012
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Gaudin, C. (author)
Offshore geotechnical engineering is characterized by unusual soil and loading conditions, a continuously moving frontier resulting in the requirement for innovative geotechnical solutions, and the very high cost associated with in-situ soil characterization and field testing in remote and deep oceans. As a consequence, offshore engineering...
conference paper 2012
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Lawson, C.R. (author)
The paper details the role modelling (analytical, physical and numerical) has played in the development of design methods for basal reinforced piled embankments; specifically the level of embankment arching and the determination of the magnitude of the tensile loads in the basal reinforcement. The paper also reviews the major national design...
conference paper 2012
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Beijer Lundberg, A. (author), Dijkstra, J. (author), Van Tol, A.F. (author)
The use of a geotechnical centrifuge for properly capturing the mechanisms in the sand adjacent to a foundation pile is well established. Larger centrifuge facilities were previously preferred over small centrifuges, because of the difficulties of the required miniature instrumentation. The technology since then has moved on and recent technical...
conference paper 2012
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De Jager, R.R. (author), Molenkamp, F. (author)
For the experimental investigation of the static liquefaction of a slope of water-saturated fine sand first a uniform submerged sand layer is composed in a large liquefaction tank by applying fluidisation by upward flowing pore water from the bottom of the tank. Subsequently a submerged slope is created by applying hydraulic suction-dredging....
conference paper 2012
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Van Eekelen, S.J.M. (author), Bezuijen, A. (author)
In the Netherlands, several field measurements were carried out in piled embankments with a geosynthetic basal reinforcement (GR). This paper presents a series of nineteen 3D model experiments on piled embankments. Purpose of the tests was to find an explanation why the calculated GR strains exceed the GR strains measured in the field. This...
conference paper 2012
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De Groot, M.B. (author), Lindenberg, J. (author), Mastbergen, D.R. (author), Van den Ham, G.A. (author)
Massive failure of submerged slopes form a major threat for many dikes along estuaries in the Netherlands, the subsoil of which consists of alternating layers of loosely packed and more densely packed sand. Static liquefaction in the loosely packed sand plays an important role. Insufficient knowledge is available to predict the flow of sand and...
conference paper 2012
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Detert, O. (author), Konig, D. (author), Schanz, T. (author)
Centrifuge tests are conducted to analyze the behavior of a new adaptive foundation system for embankments on very soft soils. The embankment is constructed in-flight in three stages. Various measurements are taken during the test, which are used for the calibration and verification of a numerical model. This paper describes the new adaptive...
conference paper 2012
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Divall, S. (author), Goodey, R.J. (author), Taylor, R.N. (author)
The expansion of urban populations comes with an associated demand for increased public transport. An often utilised solution is to construct a rapid transit system within tunnels. Generally, a pair of tunnels are constructed within relative close proximity. The construction of these tunnels will generate ground movements which have the...
conference paper 2012
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Saghaee, G. (author), Meguid, M.A. (author), Bayoumi, A. (author)
Animal burrows have been reported to cause extensive damage to existing levees and other earthen structures in different parts of the world. In this study a centrifuge model that has been designed to investigate the impact of animal burrows on the performance of an existing earthen structure is described. The proposed methodology simulates...
conference paper 2012
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Askarinejad, A. (author), Laue, J. (author), Iten, M. (author), Zweidler, A. (author), Bleiker, E. (author), Buschor, H. (author), Springman, S.M. (author)
A series of small scale physical modelling tests are performed in a geotechnical drum centrifuge in order to investigate the triggering mechanisms of landslides due to rainfall. They are conducted under controlled conditions of rainfall intensity and duration, ambient relative humidity, wind, and temperature. These tests have been designed to...
conference paper 2012
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Marques, A.S. (author), Coelho, P.A.L.F. (author), Cilingir, U. (author), Haigh, S.K. (author), Madabhushi, S.P.G. (author)
Liquefaction-induced effects are a major threat to shallow foundations built on saturated sand deposits, in seismically active regions. This type of structure is frequently used to support different structures, namely bridges, buildings, gravity walls, etc. Currently, there are few procedures in practice with limited scientific basis for...
conference paper 2012
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Van Beek, V.M. (author), Bezuijen, A. (author), Schenkeveld, F.M. (author)
Piping is one of the possible failure mechanism for dams and levees with a sandy foundation. Water flowing through the foundation causes the onset of grain transport, due to which shallow pipes are formed at the interface of the sandy layer and an impermeable blanket layer. In the past, the mechanism has been investigated predominantly in...
conference paper 2012
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Vanadit-Ellis, W. (author), Gran, J.K. (author), Vaughan, D. (author)
A 1/18-scale model of a 4-story reinforced concrete structure was tested at 18 g in the US Army Centrifuge to support the development of computational modeling of progressive collapse of multi-story buildings. The model structure was 4 bays long and 3 bays wide with column spacing about 33 cm in each directions and story height of 20.3 cm. Three...
conference paper 2012
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Halai, H. (author), McNamara, A.M. (author), Stallebras, S.E. (author)
Current guidance given on plate bearing testing of granular soils suggests that the plate be at least five times the nominal size of the coarsest material. However this limiting ratio can have a huge influence on the reaction load required from plant and resources when conducted to confirm strength parameters used in the design of the sub grade...
conference paper 2012
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McNamara, A.M. (author), Divall, S. (author), Goodey, R.J. (author), Gorasia, R.J. (author), Halai, H. (author), Rose, A.V. (author), Stallebras, S.E. (author), Taylor, R.N. (author), Xu, M. (author)
The London Geotechnical Centrifuge Centre located at City University, London is one of four currently active centrifuges in the UK. The centrifuge is well used and much of the geotechnical research at City University employs physical modelling but supported by a large element testing facility and numerical modelling capability. The centre was...
conference paper 2012
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Stanier, S.A. (author), Hu, P. (author), Cassidy, M.J. (author)
This paper demonstrates the use of a geotechnical drum centrifuge in the calibration of a model to predict the peak punch-through penetration (qpeak) resistance of a spudcan on sand overlying clay. A series of loose sand overlying clay tests was performed and combined with an existing database of tests performed on dense sand overlying clay. The...
conference paper 2012
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Bezuijen, A. (author), Van Beek, V.M. (author), Van den Ham, G.A. (author), Zwanenburg, C. (author)
Three on-going dike safety studies (on: macro stability, piping and flow slides) in the Netherlands make use of geotechnical physical models. A short outline of these projects is presented; the physical models chosen are described and discussed. The three studies use different physical models, depending on the research questions at the beginning...
conference paper 2012
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Morales, W.F. (author), Laue, J. (author), Springman, S.M. (author)
Correct scaling of breach analysis of river levees is a challenging task that is not easily accomplished by physical modelling. Several small-scale physical model tests have been conducted at 1-g level, which cannot truly represent the stress-dependency of soils, whereas the scaling issues arising from centrifuge modelling have not been fully...
conference paper 2012
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Meijer, G.J. (author), Dijkstra, J. (author)
The current paper presents a novel experimental method which is able to capture the effects of suffusion by substitution of the fines in a sample by salt of a similar grain size. The setup is tailored to optically capture the change in soil structure behind a glass window in a plane strain strongbox using a digital camera. Subsequently, digital...
conference paper 2012
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