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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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Di Emidio, G. (author), Peiffer, H. (author), Malengier, B. (author), Kison, P. (author), Bezuijen, A. (author)The purpose of this research is to validate a mathematical model for flow through saturated and unsaturated porous media using a bench-scale centrifuge for an accurate determination of the hydraulic conductivity (function of the saturation degree of a soil) within a limited time at a reasonable price. The aim of this paper is to show preliminary...conference paper 2012
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Kim, D.S. (author), Kim, M.K. (author), Kim, S.H. (author), Choo, Y.W. (author)The investigation on the seismic behavior of dams becomes crucial but is limited due to lack of experimental or field data. This paper aims to experimentally simulate the seismic behavior of three types of dams; earth-core rock-fill dam (ECRD), concrete-faced rock-fill dam (CFRD), and composite dam which combines concrete dam and CFRD. A series...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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Holscher, P. (author), Van Tol, A.F. (author), Huy, N.Q. (author)Centrifiige experiments were carried out to gain insight into the factors that affect the mobilized resistance during rapid load testing on piles in sand. The influence of generated pore water pressure during rapid load tests is shidied, and its effect on the commonly used unloadmg point method to derive the staticpile capacity. This paper...conference paper 2012
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Shuku, T. (author), Nishimura, S-I. (author), Yoshida, I. (author)Strong nonlinear behavior such as slope failure involves large uncertainties. Even if we conduct model tests on slope failure under the same test conditions, we cannot reproduce the same results although the linear behavior can be reproduced with relative ease. This kind of uncertainties is well known as “aleatory uncertainty” and they should be...conference paper 2015
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- Takahashi, A. (author), Horikoshi, K. (author), Maruyama, T. (author) conference paper 2017
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Yoshida, I. (author), Shuku, T. (author)We sometimes encounter a case in which very small change of computation or experiment condition causes the significant difference in response when strong nonlinearity is involved. Slope failure simulation due to gravity by MPS method is performed to examine feature of uncertainty. The simulation results show that the output uncertainty is...conference paper 2015
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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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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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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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Nguyen, T.C. (author), Van Lottum, H. (author), Holscher, P. (author), Van Tol, A.F. (author)Rapid and static load tests were conducted on open-ended and close-ended piles in the Deltares GeoCentriflige. hi flight, a pile was driven into the soil. Both fme-grained sand and silt beds were tested. Both the rapid and static soil resistances o f a close-ended pile were higher than the soil resistance o f an open-end pile in both sand and...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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Gorasia, R.J. (author), McNamara, A.M. (author)Ribbed bored piles are known to give increased shaft capacity in comparison to conventional straight shafted bored piles. The commercial benefit of greater pile capacity is cheaper foundations. Significant environmental benefits will also accrue from the use of efficient foundations that are able to carry higher load, leading to less excavation...conference paper 2012
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Bertalot, D. (author), Brennan, A.J. (author), Knappett, J.A. (author), Muir Wood, D. (author), Villalobos, F.A. (author)Current procedures relate potential liquefaction induced settlements to foundation size and liquefiable depth. However, the analysis of field case histories suggests that the influence of foundation bearing pressure may also be a significant factor influencing such phenomena. Data from 24 buildings that suffered settlement and tilting as a...conference paper 2012
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Ng, W.K. (author), Damodaran, M. (author)The paper describes the computational flow analysis inside industrial ventilation fans to facilitate computational design to achieve optimal fan performance characteristics eventually. Finite volume computation using the notion of sliding meshes with rotational zonal grids is used to solve the unsteady Navier-Stokes equations to simulate...conference paper 2006
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Klinkvort, R.T. (author), Leth, C.T. (author), Hededal, O. (author)The pile-soil interaction is of great importance in the design of monopiles supporting offshore wind turbines. Especially the predication of accumulation of rotations, change in stiffness and damping is difficult. The design tools used today cannot in a proper way take the effects from cyclic, lateral loading into account. In order to develop...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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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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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