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Soil property changes below existing embankments
Swedish Geotechnical Institute.
Swedish Geotechnical Institute.
2019 (English)In: ECSMGE 2019 - Geotechnical Engineering Foundation of the Future: Proceedings of the 17th European Conference on Soil Mechanics and Geotechnical Engineering, Reykjavik, 1-6 September, 2019 / [ed] Sigursteinsson, H, Erlingsson, S, Bessason, B, Reykjavik: Icelandic Geotechnical Society , 2019, p. 1-8Conference paper, Published paper (Refereed)
Abstract [en]

The properties of cohesive soils below embankments change with time after construction. The changes depend mainly on initial properties and structure of the soil layers, the size and distribution of the embankment load and time since the embankment was built. In order to analyse changes in soil properties, 80 embankments in southern Sweden built 100-150 years ago have been studied. Properties determined based on tests beside and below the embankments have been compared with empirically determined values. The results show that for embankments where the load has caused stresses above the preconsolidation pressure, the undrained shear strength (cu), the density and the natural water content have all changed within the same soil volume below the embankment. The sizes of changes in cu were mostly in the order of 20-25 % of the increase in effective stresses above the preconsolidation pressure. Additional increase in cu due to creep should also be accounted for. A methodology for estimating the increase in cu, has been developed. The methodology consists of geotechnical investigations outside existing embankments, settlement calculations, a specially proposed laboratory procedure and empirical relationships. Knowledge of the original overconsolidation ratio and shear strengths, the total load applied and perception of changes in K0 due to an embankment, are required to determine the property changes.

Place, publisher, year, edition, pages
Reykjavik: Icelandic Geotechnical Society , 2019. p. 1-8
Keywords [en]
Clay, Cohesive soil, Embankment, Subgrade, Shear strength, OCR, At rest pressure, Settlement, Creep, Time factor, Sweden, Conference, Reykjavik, 2019, English
National Category
Geotechnical Engineering
Identifiers
URN: urn:nbn:se:swedgeo:diva-804DOI: 10.32075/17ECSMGE-2019-0149Local ID: 000086297OAI: oai:DiVA.org:swedgeo-804DiVA, id: diva2:1358439
Conference
17th European Conference on Soil Mechanics and Geotechnical Engineering, Reykjavik, 1-6 September, 2019
Available from: 2019-10-07 Created: 2019-10-07 Last updated: 2019-10-18

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