Evaluating Stability Failure Modes due to Cracks in a Concrete Buttress Dam
2013 (English)In: Changing Times: Infrastructure Development to Infrastructure Management, United States of America: U.S. Society on Dams , 2013, 415-424 p.Conference paper (Refereed)
Several concrete buttress dams in northern Sweden have been found to be subjected to, more or less severe, cracks according to recent assessments and investigations. Theoretical analyses and field measurements have shown that most of these cracks have developed or propagated as a result of the seasonal temperature variations. Most dams in Sweden were built for more than 50 years ago and it is therefore important to also consider the influence of long-term effects and degradation to assess the condition of the dam. In this paper, simulations have been performed with detailed 3D nonlinear numerical analyses in order to study crack initiation and crack propagation due to stochastic variation in material properties, which represent concrete degradation. The structural response due to loads from gravity, hydrostatic water pressure and thermal seasonal effects have been considered in the studies. It was shown that weak material properties near the crack-tip will govern the trajectory of the crack. According to the analyses, significant amount of cracking can occur in the front-plate and buttress if the strength of the concrete is reduced, which lead to new potential failure modes. In addition, the extent of cracking in the buttress dam is largely governed by the induced cracking in the front-plate since these cracks have a tendency to propagate into the concrete buttress. Based on the calculated extent of cracking in the dam body, different failure modes can be assessed in order to determine the dam stability failure.
Place, publisher, year, edition, pages
United States of America: U.S. Society on Dams , 2013. 415-424 p.
IdentifiersURN: urn:nbn:se:kth:diva-129555OAI: oai:DiVA.org:kth-129555DiVA: diva2:652909
ICOLD 2013 International Symposium, Seattle, Washington USA, 14 August, 2013
QC 201403192013-10-022013-10-022014-03-19Bibliographically approved