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Some recent developments in reliability based slidingstability assessments for concrete dams
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.ORCID iD: 0000-0002-8152-6092
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.ORCID iD: 0000-0003-2584-1183
KTH, School of Architecture and the Built Environment (ABE).ORCID iD: 0000-0003-4555-0471
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.ORCID iD: 0000-0001-5372-7519
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2018 (English)In: 26th International Congress on Large Dams, 2018, CRC Press/Balkema , 2018, p. 1277-1294Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, a reliability based framework for the assessment of sliding stability for concrete dams was presented. The framework consists of several parts based on the Probabilistic model code for concrete dams developed by Westberg-Wilde and Johansson and includes guidelines on how reliability based sliding stability assessment should be performed, together with recent work by Krounis et al. how to account for partially bonded interfaces. In the proposed framework, the assessments start with performing preliminary calculations using a priori assumptions on parameters included in the analysis. If cost-benefit analyses show that further analyses could be beneficial, investigations are undertaken on relevant parameters in the failure modes. The results from the investigations are used to update the calculations in the assessment and decisions on stability enhancing measures are undertaken if necessary. In the presented example the preliminary sliding stability analysis of the interface, before testing was performed, showed a reliability index of 4.91, indicating an unacceptable failure probability of the dam without any testing. Taking into account the information obtained from testing the basic friction angle of the interface increased the reliability index from 4.91 to 7.24, clearly showing the gain of including test results in the assessment. When the influence of cohesion was accounted for a reliability index of 6.49 was obtained, which shows that cohesion can give a potential gain to the stability, even though it in this case still is lower than the gain from updating the basic friction angle. When both limit states of the interface were considered as a system the reliability index increased to 8.1.

Place, publisher, year, edition, pages
CRC Press/Balkema , 2018. p. 1277-1294
Keywords [en]
Concrete dams, Concretes, Cost benefit analysis, Friction, Interface states, System stability, Failure Probability, Partially bonded interfaces, Presented examples, Probabilistic modeling, Reliability Index, Reliability-based, Sliding stability, Sliding stability analysis, Reliability analysis
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-247231Scopus ID: 2-s2.0-85061499340ISBN: 9781138612280 (print)OAI: oai:DiVA.org:kth-247231DiVA, id: diva2:1301622
Conference
26th International Congress on Large Dams, 2018, 4 July 2018 through 6 July 2018
Note

QC 20190402

Available from: 2019-04-02 Created: 2019-04-02 Last updated: 2019-04-02Bibliographically approved

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Johansson, FredrikWestberg Wilde, MarieKrounis, AlexandraSpross, JohanRíos Bayona, Francisco

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Johansson, FredrikWestberg Wilde, MarieKrounis, AlexandraSpross, JohanRíos Bayona, Francisco
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Soil and Rock MechanicsSchool of Architecture and the Built Environment (ABE)
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