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Calibri 83ffff̙̙3f3fff3f3f33333f33333.5TU Delft Repositoryg l/uuidrepository linktitleauthorcontributorpublication yearabstract
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departmentresearch group programmeprojectcoordinates)uuid:1e82ac26c5db42479619e482e8916390Dhttp://resolver.tudelft.nl/uuid:1e82ac26c5db42479619e482e8916390NModel experiments on geosynthetic reinforced piled embankments, 3D test series!Van Eekelen, S.J.M.; Bezuijen, A.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 paper focuses on the starting points of the test series, the test setup and the scaling rules and gives a summary of the results. Van Eekelen et al., (2011b and 2011c) describe the results of the tests extensively. Five starting points were leading to the development of the test setup. (1) Possibility to evaluate the two calculation steps separately, (2) Possibility to evaluate the influence of consolidation of the subsoil, (3) Inclusion of GR, (4), Modelling the fill realistically, (5) a realistic stress level and scale. For the test conditions (static load, laboratory scale), it was found that consolidation of the subsoil results in an increase of arching. This is not in agreement with the current calculation models. Loading on the GR is concentrated on the strips lying above and between adjacent piles (the GR strips) which is in agreement with the current calculation models. The measured load on a GR strip has the distribution of an inverse triangle, although the load may be even more concentrated around the pile caps than this indicates. This is not in agreement with the current calculation models. Implementing this in the CUR/EBGEO calculation model results in 1926% less GR strain.Ngeosynthetic reinforcement; piled embankments; experiments; arching; membramesenconference paper)uuid:53c0934e4e914756b55e7e407ca69c35Dhttp://resolver.tudelft.nl/uuid:53c0934e4e914756b55e7e407ca69c354An analytical model for arching in piled embankments0Van Eekelen, S.J.M.; Bezuijen, A.; Van Tol, A.F.Most analytical models for the design of piled embankments or load transfer platforms with geosynthetic reinforcement (GR) include two calculation steps. Step 1 calculates the arching behaviour in the fill and step 2 the loaddeflection behaviour of the GR. A calculation method for step 2 based on the results of model tests has been published by Van Eekelen et al. (2012a,b). The present paper analyses and presents a new model for step 1, which is the arching step. Additional tests, which are also presented in this paper, were conducted for this purpose. The new model is a limitstate equilibrium model with concentric arches. It is an extension of the models of Hewlett and Randolph (1988) and Zaeske (2001). The new model results in a better representation of the arching measured in the experiments than the other models mentioned, especially for relatively thin fills. Introducing GR in a piled embankment results in a more efficient transfer of load to the piles in the form of an arching mechanism. The load is then exerted mainly on the piles and the GR strips between the piles, on which the load is approximately distributed as an inverse triangle. The new model presented in this paper describes this behaviour and is therefore meant to describe the situation with GR. The new model provides a physical explanation for observations of the arching mechanism, especially the load distribution on the GR. Other observations with which this model concurs are the dependency on fill height and friction angle. The amount of arching increases with increasing subsoil consolidation and GR deflection. The paper describes how the new model relates to the development of arching as a result of subsoil consolidation.sload t<ransfer platforms; arching; piled embankments; soil reinforcement; concentric arches model; analytical modelsjournal articleElsevier!Civil Engineering and GeosciencesGeoscience & Engineering)uuid:8ffdcdce76c243ebbe53647e5ca36a09Dhttp://resolver.tudelft.nl/uuid:8ffdcdce76c243ebbe53647e5ca36a09TValidation of analytical models for the design of basal reinforced piled embankmentsVan Eekelen et al., 2012a, Van Eekelen et al., 2012b and Van Eekelen et al., 2013) have introduced an analytical model for the design of the geosynthetic reinforcement (GR) in a piled embankment. This paper further validates this model with measurements from seven fullscale tests and four series of scaled model experiments. Most of these measurements have been reported earlier in the literature. The new model describes arching with the Concentric Arching model (CA model). This model is an extension of the single arch model of Hewlett and Randolph (1988) and the multiscale model of Zaeske (2001), which is also described in Kempfert et al. (2004). For loaddeflection behaviour, Van Eekelen et al., 2012a, Van Eekelen et al., 2012b and Van Eekelen et al., 2013) proposed the use of a net load distribution that is inverse triangular instead of uniform or triangular. These authors also proposed the inclusion of all the subsoil support beneath the GR in the calculations. On the basis of comparisons between the measurements and calculations, it is concluded that the CA model matches the measurements better than the models of Zaeske or Hewlett and Randolph. Where there is no subsoil support, or almost no subsoil support, the inverse triangular load distribution on the GR strips between adjacent piles gives the best match with the measurements. Cases with subsoil support generally lead to less GR strain. In the cases with significant subsoil support, the load distribution is approximately uniform. In the cases with limited subsoil support, it should be determined which load distribution gives the minimum GR strain to find the best match with the measurements.pgeosynthetics; piled embankments; load transfer platforms; geosynthetic reinforcement; field monitoring; arching
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