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Impact of groundwater level on the mechanical response of a flexible pavement structure: a case study at the Torpsbruk test section along county road 126 using Falling Weight Deflectometer
Swedish National Road and Transport Research Institute, Infrastructure, Pavement Technology.ORCID iD: 0000-0001-9482-1691
Swedish National Road and Transport Research Institute, Infrastructure, Pavement Technology.
2014 (English)Report (Other academic)Alternative title
Påverkan av grundvattennivån på den mekanistiska responsen av en vägkonstruktion : en studie på provväg Torpsbruk på länsväg 126 med fallviktsmätningar (Swedish)
Abstract [en]

Excess moisture presence in pavement unbound layers can result in lower structural stiffness and reduce the service life of road systems. A field study was conducted along the county road 126 near Torpsbruk to investigate the effect of the moisture content on the bearing capacity of a flexible pavement structure and its unbound layers stiffness. The subsurface drainage system of the test road was clogged during a three-month period in summer 2010, raising the groundwater level under pavement structure and therefore increasing the moisture content of the pavement unbound layers. During this period, the groundwater level and the volumetric moisture content of the pavement was continuously monitored using the instrumentations at test site and the structural response of the pavement was evaluated by conducting frequent Falling Weight Deflectometer (FWD) tests with multilevel loads. Using the FWD data, the unbound layers stiffness were back-calculated and their sensitivity to the moisture content and load level were studied. The field measurements showed that the groundwater level can significantly affect the moisture condition of the unbound layers and therefore their stiffness. Both the unbound granular layer and the subgrade showed stress dependent behavior to multilevel FWD loads.

Abstract [sv]

Ökad fuktkvot i vägars obundna lager kan inverka på vägkonstruktionens strukturella styvhet och minska dess livslängd. En fältstudie gjordes längs riksväg 126 nära Torpsbruk för att undersöka de obundna lagrens fuktkvoter på vägkonstruktionens strukturella respons och styvhet. Vägkonstruktionens dräneringssystem täpptes till under tre månader under sommaren 2010. Tilltäppningen av dräneringssystemet resulterade i en snabb höjning av grundvattennivån, samtidigt ökade de obundna lagrens fuktkvot. Under studieförloppet har grundvattennivåns läge och fuktkvoten i vägkonstruktionens obundna lager mätts kontinuerligt med hjälp av fältinstrumenteringar. Dessutom gjordes frekventa fallviktsmätningar med tre lastnivåer för att mäta konstruktionens strukturella respons. På så sätt kunde lastnivåns och fuktkvotens inverkan på de obundna lagrens beteende studeras med målsättningen att bestämma egenskaperna hos de obundna materialen genom bakberäkning av fallviktmätningsdata. Enligt bakberäkningarna resulterade konstruktionens fuktökning till en betydande reducering av de obundna lagrens styvhet. Det observerades dessutom att de obundna lagren visade ett spänningsberoende beteende under de olika lastnivåerna vid fallviktsmättningarna.

Place, publisher, year, edition, pages
Linköping: VTI , 2014. , 49 p.
Series
VTI rapport, ISSN 0347-6030 ; 808A
Keyword [en]
Bearing capacity, Water table, Moisture content, Deflection, Unbound base, Flexible pavement, Falling weight deflectometer, Experimental road
National Category
Other Materials Engineering
Research subject
Road: Highway design, Road: Pavement design
Identifiers
URN: urn:nbn:se:vti:diva-6825OAI: oai:DiVA.org:vti-6825DiVA: diva2:706306
Available from: 2014-03-19 Created: 2014-03-19 Last updated: 2016-02-25Bibliographically approved

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