The influence of correlation between cohesion and friction angle on the probability of failure for sliding of concrete dams
2012 (English)In: Proceedings of the 3rd International Forum on Risk Analysis, Dam Safety Dam Security and Critical Infrastructure Management / [ed] Ignacio Escuder-bueno, Enrique Matheu, Luis Altarejos-garcfa, CRC Press, 2012, 75-80 p.Conference paper (Refereed)
In the latest years there has been a trend towards an implementation of structural reliability analysis, SRA, in the stability assessment of concrete dams. In these analyses, it is in general assumed that the basic variables are independent of each other. However, this may be incorrect. For example, when the shear strength of the bonded concrete-rock interface is approximated with the Mohr-Coulomb failure criterion, the linear approximation of the curved failure envelope implies that a negative correlation between cohesion and friction could be expected. The aim of this paper is to study how correlation between friction angle and cohesion for a bonded interface may affect the sliding stability of concrete gravity dams founded on rock. For this purpose, experimental data from uniaxial and triaxial compressive tests performed on intact rock were used in order to study the existence and magnitude of a possible negative correlation between friction angle and cohesion. After that, the reliability index for a concrete gravity dam was calculated using negatively correlated and uncorrelated friction angle and cohesion. The results showed that the safety index increased significantly as the correlation coefficient decreased. Therefore, in order to calculate the reliability of dams correctly in the future, it is important to study and determine the magnitude of this correlation.
Place, publisher, year, edition, pages
CRC Press, 2012. 75-80 p.
Adhesion, Concrete dams, Critical infrastructures, Friction, Gravity dams, Hydraulic structures, Public works, Reliability analysis, System stability, Tribology
Civil Engineering Geotechnical Engineering
IdentifiersURN: urn:nbn:se:kth:diva-75319ISI: 000300401800011ScopusID: 2-s2.0-84856750729ISBN: 978-0-415-62078-9OAI: oai:DiVA.org:kth-75319DiVA: diva2:490455
3rd International Week on Risk Analysis, Dam Safety, Dam Security, and Critical Infrastructure Management, October 17-21, 2011. Valencia, Spain
QC 201204132012-02-052012-02-052016-04-11Bibliographically approved