Lelio Mejia, Ph.D. (California) will present a paper on "Earthquake-induced Cracking of Embankment Dams" at the 87th Annual Meeting and Symposium of the International Commission on Large Dams (ICOLD) at the Shaw Center in Ottawa, Canada from June 9-14, 2019. As the U.S. Delegate on the ICOLD Committee on Seismic Aspects of Dam Design, Lelio will also presenta on the "Performance of Dams During the 2018 M 7.1 Anchorage, Alaska Earthquake."
Lelio is a Senior Principal Engineer based in California with more than 35 years of experience in geotechnical and earthquake engineering. For many years, he has focused on the challenges of dam and levee engineering, and he is a leading international authority in this field, with emphasis on the seismic design and performance of dam structures. Lelio leads Geosyntec's Western U.S. dams and levees practice and is a registered civil and geotechnical engineer.
ICOLD is a non-governmental, international organization that provides a forum for the exchange of knowledge and experience in dam engineering. ICOLD is a leader in setting standards and guidelines to ensure that dams are built and operated safely, efficiently, and economically and are environmentally sustainable and socially equitable.
Every year, ICOLD holds an Annual Meeting and Symposium in a selected country. The ICOLD Annual Meeting is an opportunity for delegates from the 100 ICOLD member countries to come together and collaborate on topics of interest to dam owners, engineers and scientists, and regulators.
ICOLD has established Technical Committees that address current technical issues related to the development and management of water resources. The committees, including the ICOLD Committee on Seismic Aspects of Dam Design, normally meet once a year during the ICOLD Annual Meeting.
Cracking due to embankment seismic deformation is one of the most hazardous consequences of earthquakes on embankment dams. Cracking is commonly observed at the crest of dams and often develops parallel to the dam axis (i.e. longitudinal cracking) or transverse to it. Transverse cracking at the crest is of major concern because, if it extends below the reservoir level, it can lead to leakage from the reservoir. If unimpeded, water flows through cracks can lead to internal erosion, piping, and failure of a dam. Considerable effort has been made by the dam engineering profession over the last few decades to study the nature and effects of earthquake-induced cracking of embankment dams. In addition, defensive design and construction measures to minimize the occurrence of embankment cracking and to mitigate its potential consequences have been developed. This paper provides a synopsis of available methods to assess the potential for earthquake-induced cracking of embankment dams. In addition, the evaluation of potential cracking using three-dimensional nonlinear dynamic analyses is illustrated through a case history of the dynamic response analysis of Lenihan Dam during the M 6.9 1989 Loma Prieta Earthquake.
Learn more about the event: www.icold-cigb2019.ca
Learn more about ICOLD: https://www.icold-cigb.org/
Learn more about Lelio: https://www.geosyntec.com/people/lelio-mejia