Implementation of Shakedown and Packing theories for Unbound Granular materials
(English)In: Construction and Building Materials, ISSN 0950-0618Article in journal (Other academic) Submitted
The shakedown theory is a tool to characterize the state of the structural system of an unbound granular material that is subjected to repeated loading when its response has become resilient in nature and no further accumulation of plastic strain occurs. This paper demonstrates the application of both shakedown and packing theories to characterize permanent deformation behaviour of unbound aggregate materials. Ranges of shakedown phenomenon (Ranges A, B and C) for some selected unbound materials have first been investigated based on their permanent strain responses. The disruption potential (DP) of the primary structure (PS) of the aggregate assemblage has then been determined for each grain size distribution based on a packing theory model. The DP was found to characterize satisfactorily the three types of shakedown ranges. A sensitivity analysis has also been done on DP values by changing the dry density and specific gravity, revealing the importance of these characteristics for shakedown. Further, a finite element analysis was performed to determine the shakedown limit load as a mean stress and a dimensionless shakedown load. The analysis was simulated using the Mohr-coulomb yield criteria for a three-dimensional cylindrical sample. From this study the DP value was found to compare favorably with the predicted mean stress and dimensionless shakedown load.
Shakedown theory, packing theory, unbound material, disruption potential, permanent strain
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-143485OAI: oai:DiVA.org:kth-143485DiVA: diva2:706694
QS 20142014-03-212014-03-212014-03-24Bibliographically approved