Stability for a high embankment founded on sulphide clay
2013 (English)In: Proceedings of the Institution of Civil Engeneers: Geotechnical Engineering, ISSN 1353-2618, Vol. 166, no 1, 31-48 p.Article in journal (Refereed) Published
During staged construction of embankments on clay foundations, the undrained shear strength s(u) increases due to consolidation during the construction process. The increase is usually related to the pre-consolidation pressure sigma'(p) by way of the ratio s(u)/sigma'(p) and is important when assessing the stability of an embankment. Properties controlling the increase are usually associated with various unknowns that can be difficult to predict before construction. A case involving a large embankment built on vertically drained sulfide clay is presented. Empirical knowledge and experience of similar constructions on sulfide clay were limited, therefore there were uncertainties of the soil-drain interaction and how the soil would behave under the embankment load. A trial embankment was built to gather knowledge and experience of this particular soil and the observational method was adopted. The study presents how embankment stability was predicted at design stage and controlled during construction. It highlights the importance and usefulness of obtaining measurement data from different types of measurements. Laboratory tests and a large number of in situ tests at different stages during construction were performed to assess s(u)/sigma'(p) ratios in the sulfide clay. The mean s(u)/sigma'(p) ratio was estimated by means of statistical analysis to 0.25 for a large stress interval.
Place, publisher, year, edition, pages
2013. Vol. 166, no 1, 31-48 p.
embankments, field testing & monitoring, geotechnical engineering
Civil Engineering Geotechnical Engineering
IdentifiersURN: urn:nbn:se:kth:diva-25824DOI: 10.1680/geng.9.00080ISI: 000313738500005ScopusID: 2-s2.0-84878074873OAI: oai:DiVA.org:kth-25824DiVA: diva2:359975
QC 201302132010-11-012010-11-012013-05-29Bibliographically approved