Embankment supported on piles with biaxial geogrids

The case study consists of a piled embankment built over a very soft, organic compressible clay layer 10 m deep. The height of the embankment supported on piles was about 1·3 m, and the piles, which measured 0·18 m × 0·18 m, were spaced 2·5 m apart in a square pattern, with 0·8 m wide square pile ca...

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Bibliographic Details
Published in:Proceedings of the Institution of Civil Engineers. Geotechnical engineering 2007-10, Vol.160 (4), p.185-192
Main Authors: ALMEIDA, M. S. S, EHRLICH, M, SPOTTI, A. P, MARQUES, M. E. S
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Exact sciences and technology
Geotechnics
Miscellaneous
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Summary:The case study consists of a piled embankment built over a very soft, organic compressible clay layer 10 m deep. The height of the embankment supported on piles was about 1·3 m, and the piles, which measured 0·18 m × 0·18 m, were spaced 2·5 m apart in a square pattern, with 0·8 m wide square pile caps covered with a bidirectional 200 kN/m geogrid polyester reinforcement. A region of the piled supported embankment was instrumented to provide a better understanding of the overall embankment-reinforcement-pile cap system. Three-dimensional and two-dimensional pile layouts were adopted. An excavation of 1 m under the geogrid was carried out to induce rapid load transference to the geogrid. The settlement in between pile caps was 0·10–0·4 m, whereas settlements in the region under similar embankment heights were much higher, thus demonstrating the efficacy of pile-supported embankments with geogrids in controlling settlements. Strains at the reinforcement were also measured, and showed values in the range 0·25–2·05%.
ISSN:1353-2618
1751-8563
DOI:10.1680/geng.2007.160.4.185