| 1. |
- Björnsson, G, et al.
(författare)
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Thaw induced bearing capacity of road materials
- 2007
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Ingår i: Proceedings of the XIV European Conference on Soil Mechanics and Geotechnical Engineering. ; , s. 1613-1618
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Konferensbidrag (refereegranskat)
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| 2. |
- Charlier, R, et al.
(författare)
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Modelling Coupled Mechanics, Moisture and Heat in Pavement Structures
- 2009
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Ingår i: Water in Road Structures. - Dordrecht : Springer. ; , s. 243-281
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Bokkapitel (refereegranskat)abstract
- Different physical problems have been analysed in the preceding {chapters}: they relate to water transfer, to heat transfer, to pollutant transfer and to mechanical equilibrium. All these problems are governed by differential equations and boundary conditions but analytical solutions are, in general, unobtainable because of the complex interaction of the various aspects which are always present in real-world situations. In such circumstances, numerical modelling can give a valuable alternative methodology for solving such highly coupled problems. The first part of this chapter is dedicated to a brief statement of the finite element method for highly coupled phenomena. In the second part, a number of numerical simulations are summarised as an illustration of what could be done with modern tools. The chapter shows that it is possible to achieve realistic results although, at present, some simplification is often required to do so.
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| 3. |
- Charlier, R, et al.
(författare)
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Water Influence on Bearing Capacity and Pavement Performance : Field Observations
- 2009
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Ingår i: Water in Road Structures. - Dordrecht : Springer. - 9781402085611 ; , s. 175-192
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Bokkapitel (refereegranskat)abstract
- This chapter presents a mechanical behaviour study, i.e. the bearing capacity as a function of the moisture degree. The field point of view is expressed and the chapter summarises a number of observations on road behaviour, in relation to variations of moisture. First, the road structure is recalled with respect to the mechanical analysis point of view. Then some observations on field under temperate climate, humid, are given. In a second step, the specific case of frost and thawing are discussed.
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| 4. |
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| 5. |
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| 6. |
- Erlingsson, Sigurd, et al.
(författare)
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Measurements Techniques for Water Flow
- 2009
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Ingår i: Water in road structures. - : Springer. - 9781402085611 ; , s. 45-67
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Bokkapitel (refereegranskat)
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| 7. |
- Erlingsson, Sigurd
(författare)
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Numerical Modeling of Thin Pavements Behavior in Accelerated HVS Tests
- 2007
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Ingår i: International Journal of Road Materials and Pavement Design. - 1468-0629. ; 8:4, s. 719-744
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Tidskriftsartikel (refereegranskat)abstract
- Two thin road structures have been tested in accelerated testing by using a Heavy Vehicle Simulator (HVS). Both were surface dressed structures, one with a target 20 cm thick unbound base course layer and the other with the base divided into a 10 cm bitumen stabilized base over 10 cm unbound base. The tested road structures were instrumented to estimate deflections, strains and stresses in various locations inside the structure. Numerical analyses, by using two different techniques, the multilayer elastic theory (MLET) and the finite element (FE) have been carried out to simulate the response behaviour of the tested structure and compared with the actual measurements. For both techniques linear and non-linear behaviour of the base was assumed. For the FE method both 2D axisymmetric and a 3D analysis were carried out. The results have further been used to model the permanent deformation development in each layer. The main finding of the study was that induced vertical stresses were generally well predicted in both structures. Better agreement was generally found between the vertical stresses and the actual response with the non-linear response, especially for high loading conditions. The best prediction of surface deflections was obtained in a three dimensional linear elastic analysis where a rectangular loading area was used instead of a circular one in the two dimensional axisymmetric solutions. Generally poor or moderate agreement was found between the strain measurements and the numerical estimations. The simple work. hardening model used to model the accumulated deformation relied on results from repeated load triaxial test results and gave generally good agreement with the results from the testing.
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| 8. |
- Erlingsson, Sigurd
(författare)
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Numerical Modeling of Unbound Granular Materials in Pavement Structures
- 2005
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Ingår i: Proceedings of the 16th International Conference on Soil Mechanics and Geotechnical Engineering. ; , s. 1699-1702
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Konferensbidrag (refereegranskat)abstract
- New pavement design methods are under development where the aim is to predict functional and structural conditions of the road over time. To be able to take advantage of these new design methods a better understanding of the ability to calculate the response of pavement structures due to vehicle load is needed were the mechanical properties of the constituent materials are properly presented. For thin pavement structures the granular materials, base and subbase layers, play an essential role in the overall structural performance. However they show a complex elasto-plastic behaviour under external loading. An instrumented thin surface dressed pavement structure has been tested in accelerated testing by using a Heavy Vehicle Simulator (HVS). The response of the structure due to traffic loading was measured and thereafter two different numerical techniques used to predict the structural behaviour, the Multilayer Elastic Theory (MLET) and the Finite Element (FE) method. Both linear and nonlinear elastic analyses have been carried out to simulate the response of the structure. It was found that analyses where the nonlinear base behaviour is taken into account gave better agreement with measurements compared to a linear elastic analyses. Based on the calculated response of vertical strain in the pavement structure as well as from results from Repeated Load Triaxial (RLT) testing a simple power law function is used to estimate the development of rutting in the pavement structure and compared to actual measurements. Good agreement was found between the actual measurements and the calculations.
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| 10. |
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