Permissible spatial variation of CCC data from driving comfort requirements over time. Issue 2 (27th April 2020)

• Record Type: Journal Article
• Authors: Stark, Anne; Törzs, Tom; Grabe, Jürgen
• Is Part Of: Proceedings of ICE. Volume 173:Issue 2(2020:Apr.)
• Page Start: 1
• Page End: 25
• Publication Date: 2020-04-27
• Subjects: dynamics -- pavement design -- statistical analysis; Geotechnical engineering -- Periodicals; 624.151
• DOI: 10.1680/jgeen.19.00195
• Languages: English
• ISSNs: 1353-2618

Abstract

Abstract : Spatial variations of soil properties occur even within nominally homogeneous soil layers. To perform a reliable geotechnical design, it is necessary to consider local variations of soil properties. A varying soil stiffness leads to spatially variable settlements which imply increasing dynamic forces on passing vehicles. Higher dynamic forces result in additional settlements and simultaneously reduce driving comfort. This process continues steadily until a repair of the asphalt pavement is required. The aim of this paper is to provide a new mechanically reasoned method in order to derive the permissible spatial variation of Continuous Compaction Control data from driving comfort requirements. Therefore, a numerical model is presented which allows for modeling the long-term evenness of asphalt pavements due to passing vehicles taking into account a spatial variation of the subsoil stiffness. The numerical model is based on subgrade reaction method modeling surface and subjacent base courses by a series ofspring elements. Thereby, a depth-dependent stress distribution and interaction of base courses are considered. The initial stiffness of the spring elements is derived from oedometer tests. Depending on traffic load and utilisation period, the long-term evenness of the asphalt pavement and effects of a spatially varying subsoil stiffness are investigated.