Alternative Title
Paper No. 2.43
Location
St. Louis, Missouri
Date
10 Mar 1998, 2:30 pm - 5:30 pm
Abstract
An inspection of Ivins Bench dam and reservoir was performed following a 5.8 magnitude (Mw) earthquake in southern Utah. Sand was observed flowing from the drainage collection system and the Utah Division of Dam Safety requested that the reservoir be drained and the embankment repaired. Dames & Moore evaluated the liquefaction potential of the embankment and concluded that the embankment was not suitable for maximum storage. A repair concept using a soil-cement mix wall was developed and a dynamic stability analysis was performed using the computer program PLAC. The dynamic analysis indicated that the soil-cement wall would improve embankment stability and significantly lower the phreatic surface downstream of the wall, thus reducing the liquefaction potential. One hundred and fourteen (114) soil-cement panels (6.83-feet wide and 34-inches thick) ranging from 18 to 50 feet in depth were installed parallel to the upstream crest of the embankment. The panels penetrated 3-feet into the bedrock underlying the embankment. Subsequent to construction, a 36-inch diameter outlet pipe was installed through both the embankment and soil-cement mix wall by microtunneling methods. A new intake structure was also constructed. Construction began in January, 1996 and the reservoir was filled during spring 1997 runoff.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
4th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 1998 University of Missouri--Rolla, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Owens, Russell L., "Seismic Evaluation, Soil-Cement Mix Wall and Outlet Pipe Installation, Ivins Bench Dam, Utah" (1998). International Conference on Case Histories in Geotechnical Engineering. 21.
https://scholarsmine.mst.edu/icchge/4icchge/4icchge-session02/21
Seismic Evaluation, Soil-Cement Mix Wall and Outlet Pipe Installation, Ivins Bench Dam, Utah
St. Louis, Missouri
An inspection of Ivins Bench dam and reservoir was performed following a 5.8 magnitude (Mw) earthquake in southern Utah. Sand was observed flowing from the drainage collection system and the Utah Division of Dam Safety requested that the reservoir be drained and the embankment repaired. Dames & Moore evaluated the liquefaction potential of the embankment and concluded that the embankment was not suitable for maximum storage. A repair concept using a soil-cement mix wall was developed and a dynamic stability analysis was performed using the computer program PLAC. The dynamic analysis indicated that the soil-cement wall would improve embankment stability and significantly lower the phreatic surface downstream of the wall, thus reducing the liquefaction potential. One hundred and fourteen (114) soil-cement panels (6.83-feet wide and 34-inches thick) ranging from 18 to 50 feet in depth were installed parallel to the upstream crest of the embankment. The panels penetrated 3-feet into the bedrock underlying the embankment. Subsequent to construction, a 36-inch diameter outlet pipe was installed through both the embankment and soil-cement mix wall by microtunneling methods. A new intake structure was also constructed. Construction began in January, 1996 and the reservoir was filled during spring 1997 runoff.
