Analysis of Response and Development of Permanent Deformation of Unbound Granular Materials Using a Testing Box Technique
Author
Summary, in English
The main objective of this thesis is to study the response and development of permanent deformation in unbound granular materials, theoretically and experimentally. A testing box technique is used here to more closely simulate the behaviour of unbound aggregates subjected to external vertical loading.
A small box device (800×800×800 mm) is employed to test both the response and permanent deformation characteristics of unbound granular materials (UGM) subjected to external pulsating loading. The response is measured with LVDTs within the tested materials. A subbase, 200 mm in thickness, is compacted in layers up to a desired degree of compaction, and thereafter a base course, 80 mm or
150 mm in thickness, is compacted, over the subbase material. After a series of tests of different quality of unbound base course materials, the material response and performance are modelled using a multilayer elastic approach and three different simple performance models. The principal conclusion is that the testing box method captures the main behaviour of the materials. Good correspondence is achieved between the calculated and the observed behaviours for different levels of applied stress.
A small box device (800×800×800 mm) is employed to test both the response and permanent deformation characteristics of unbound granular materials (UGM) subjected to external pulsating loading. The response is measured with LVDTs within the tested materials. A subbase, 200 mm in thickness, is compacted in layers up to a desired degree of compaction, and thereafter a base course, 80 mm or
150 mm in thickness, is compacted, over the subbase material. After a series of tests of different quality of unbound base course materials, the material response and performance are modelled using a multilayer elastic approach and three different simple performance models. The principal conclusion is that the testing box method captures the main behaviour of the materials. Good correspondence is achieved between the calculated and the observed behaviours for different levels of applied stress.
Department/s
Publishing year
2011
Language
English
Publication/Series
Bulletin
Volume
268
Document type
Dissertation
Publisher
Department of Technology and Society, Lund University
Topic
- Infrastructure Engineering
Keywords
- Unbound granular materials
- testing box
- response
- permanent deformation
Status
Published
Supervisor
- Christer Hydén
ISBN/ISSN/Other
- ISBN: 978-91-7473-162-0
Defence date
9 September 2011
Defence time
10:15
Defence place
Lecture hall K:D, Sölvegatan 39, Lund University Faculty of Engineering
Opponent
- Pauli Kolisoja (Professor)