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Bearing Capacity of Soil Layers between Shallow Foundations and near Surface Bedrock: A Laboratory Study on Geotechnical Properties
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Shallow foundations are a common design for the base of any construction. Allowable ground pressure limits below such foundations are until today calculated based on Terzaghis General Bearing Capacity Equation, which gives a limit to the maximal allowable value. Shallow bed rock levels are a common scenario on Swedish construction sites and its effect on the allowable bearing capacity is not considered yet. This Master Thesis investigates the increase of bearing capacity for foundations on a thin soil layer above bedrock. In a laboratory 1G model scale test, a model foundation’s settlement under loading is investigated. It is observed that ground failure comes to a stop as the remaining soil layer thickness is sufficiently thin. From this point on bearing capacity increases significantly. The results are compared to literature and a study in PLAXIS 2-D. The results are judged indicative and further laboratory testing with usage of a centrifuge is recommended.

Abstract [sv]

Grunda fundament är en vanlig design för grunden av många byggnader. Tillåtna grundtrycket för sådana fundament är tills idag beräknat baserat på Terzaghis Allmänna bärighetsekvation, vilket ger en gräns för det maximala tillåtna värdet. Grunda bergsnivåer är ett vanligt scenario på svenska byggarbetsplatser och dess effekt på den tillåtna bärkraften övervägs inte ännu. Detta examensarbete undersöker ökningen av bärförmågan för fundament på ett tunt fyllningsskikt ovanför berggrunden. I ett 1G-modellskalestest i laboratorieförhållanden undersöks ett modell-fundaments  sättning  under  last.  Det  observeras  att  markbrottet  upphör  när  det  återstående fyllningsskiktets tjocklek är tillräckligt tunn. Från denna tidpunkt ökar bärkraften signifikant. Resultaten jämförs med litteratur och en studie i PLAXIS 2-D. Resultaten bedöms vägledande och ytterligare laboratorietestning med användning av en centrifug rekommenderas. 

Place, publisher, year, edition, pages
2018. , p. 60
Keywords [en]
shallow foundation bedrock bearing capacity thin
National Category
Geotechnical Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-71362OAI: oai:DiVA.org:ltu-71362DiVA, id: diva2:1259199
External cooperation
Erik Westerberg (NCC Teknik Solna)
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering, master's level (120 credits)
Presentation
2018-09-25, Luleå, 15:00 (English)
Supervisors
Examiners
Available from: 2018-11-06 Created: 2018-10-28 Last updated: 2018-11-06Bibliographically approved

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