Report on US Activities

ICOLD 85th Annual MeetingCommittee on Seismic Aspects of Dam Design

Lelio Mejia, PhD, PE, GEGeosyntec Consultants

Chair, USSD Earthquakes Committee

July 4, 2017

Outline

• USSD Earthquakes Committee– Membership– Current initiatives

• Other Activities• Key US Seismic Projects

USSD Earthquakes CommitteeMembership

• 35 members• Owners, regulators, consultants

SAM ABBASZADEH HUSEIN HASANRICHARD ARMSTRONG GEORGE F. HOROWITZENG SEW AW PETER J. HRADILEKDONALD H. BABBITT (Vice) JENNIFER HUGGINSJOHN BARNEICH DINA HUNTMICHAEL H. BEATY C. MICHAEL KNARRMOHSEN BEIKAE RICHARD W. KRAMERNAJIB BOUAANANI C. ERIC LINDVALLROSS BOULANGER FAIZ I. MAKDISIBRUCE BRAND LELIO MEJIA (Chair)THOMAS BROWN JACK MONTGOMERY (Vice)WILLIAM BROWN LARRY NUSSCLINTON CARLSON WARREN J. PAULKERRY CATO PHOEBE PERCELLANDREW DINSICK MARC RYANJOSEPH L. EHASZ MARK SCHULTZNICOLAS VON GERSDORFF JOHN C. STOESSELYUSOF GHANAAT

Current Initiatives• Publications

– Report on “Blind Prediction of Seismic Response of Monticello Dam” - Paper No. 277 by P. Percell

– Guidelines for seismic deformation analysis of embankment dams

– Update of guidelines for selection of ground motion parameters for dams

– Update of guidelines for seismic design and evaluation of structures appurtenant to dams

• Workshop on “Seismic Analysis of Concrete Dams”, 2017 USSD Conference

• Workshop on “Validation of Numerical Models in the Analysis of Concrete Dams”, 2018 USSD Conference

Guidelines for Seismic Deformation Analysis of Embankment Dams

• Introduction• Seismic performance of embankment dams• Overview of deformation analysis approaches • Simplified analyses • Sliding block analyses • Non-linear deformation analyses • Evaluation and documentation of analysis results • Guidance on use of deformation analyses • Summary

Workshop on Seismic Analysis of Concrete Dams

• Case histories and seismic PFMs• Field investigations and material properties• Comparison of recorded and computed responses• Linear analysis• Non-linear analysis• Selection of ground motions• Accuracy of analysis• Practical considerations• Research needs

Other Activities• National Resources Council Project on ” State of the

Art and Practice in Earthquake Induced Soil Liquefaction Assessment”, Report at: https://www8.nationalacademies.org

• TVA Engineering Guidelines for “Seismic Assessment of Embankment Dams”, 2017

• Report on USBR Workshop on “Assessing the State of Practice in Seismic Analysis of Embankment Dams”, 2017

• Workshop on “Special Issues for Design and Construction of Dams in Cold Climates”, Anchorage, Alaska, September 18 – 20, 2017

• USSD Annual Meeting & Conference, Miami, Florida, May, 2018

On-going US Dam Seismic Projects (1)

• Under Construction– Perris Dam Retrofit, DWR, California– Calaveras Dam Replacement, SFPUC, California

• In Design– Lake Isabella Dam Retrofit, USACE, California– Priest Rapids Dam Retrofit, GCPUD, Washington– Howard Prairie Dam Retrofit, USBR, Oregon– North Haiwee Dam Replacement, LADWP, CA– Anderson Dam Replacement, SCVWD, California– Calero Dam, SCVWD, California– Guadalupe Dam, SCVWD, California

On-going US Dam Seismic Projects (2)

• In Planning– Boca Dam, USBR, California– Scoggins Dam, USBR, Oregon– Blue Ridge Dam Retrofit, TVA, Georgia

Thank You

On-going Key US Dam Seismic Projects

• Perris Dam Retrofit, DWR, California• DSM foundation treatment and downstream

buttress

Key US Dam Seismic Projects (2)

• Calaveras Dam Replacement, SFPUC, California• New replacement embankment dam, downstream

of existing dam• New spillway and outlet works

Key US Dam Seismic Projects (3)

• Lake Isabella Dam Retrofit, USACE, California• Downstream buttress on alluvium foundation

treated with shear walls• Special zoning for foundation fault rupture• New spillway and dam crest raise