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Statistical analysis of thaw index for thaw weakening design purposes
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
Luleå University of Technology.
2016 (English)In: Proceedings of Nordic Conference on Soil Mechanics and Geotechnical NGM: Reykjavik, Iceland 25th – 28th of May 2016, 2016, 1321-1327 p.Conference paper (Refereed)
Abstract [en]

In frost action research and design most focus has been put on frost heave. There are several models available to predict frost heave and the concept of statistical re-occurrence times of frost index is commonly used in design. Less effort has been put on thaw weakening modeling and design even though thaw weakening causes a lot of damage on infrastructure such as road and railways. In e.g. Sweden the Transport Administration collects temperature data during the freezing season for frost heave design purposes on project levels but thawing effects are conventionalized by reference tables on a regional level.The aim of this study is to define and quantify the thawing event in such way that it could be applied on a project level in a similar way as temperature measurements are used for frost design. In this study thaw index has been analysed statistically based on air temperature data from 50 stations, collected from year 1951 and onwards by the Swedish Meteorological and Hydrological Institute (SMHI), in Sweden. The temperature thaw seasons have been correlated to the Swedish Transport Administrations frost depth measurement stations.A reference table has been developed based on reoccurrence times of thawing seasons based on the magnitude of thawing index. Based on the statistical distribution of thawing indexes Sweden was divided into three regions in this study. It seems, by statistical means, to be fully possible to develop reference values for thawing periods where thawing index is the working unit. In order to implement the results in e.g. pavement design thawing temperature measurements on a local or semi-regional level are required.

Place, publisher, year, edition, pages
2016. 1321-1327 p.
Keyword [en]
Civil engineering and architecture - Building engineering
Keyword [sv]
thaw weakening, thaw design, Samhällsbyggnadsteknik och arkitektur - Byggnadsteknik
Research subject
Soil Mechanics; Sustainable transportation (AERI)
URN: urn:nbn:se:ltu:diva-38768Local ID: d4323efa-7d85-4ea5-8868-cd161d7bb6d4OAI: diva2:1012269
Nordic Geotechnical Meeting : Challanges in Nordic Geotechnics 25/05/2016 - 27/05/2016
Godkänd; 2016; 20160530 (tomede)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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