Location
St. Louis, Missouri
Presentation Date
30 Apr 1981, 1:30 pm - 5:30 pm
Abstract
The Spinney Mountain Dam, now under construction in central Colorado, is a zoned earth embankment with a maximum height of 95 feet above foundation. Detailed geological investigations revealed rejuvenated sediments of nearby older faults, which have undergone tectonic movement within the past 13,000 to 30,000 years and hence are considered capable. Studies indicate the largest earthquake expected on the controlling fault would have a Richter Magnitude of about 6.2, implying peak ground accelerations at the site of about 0.6g and a 15-second duration of strong motion. Displacement on a branch of the main capable fault during such an event is estimated at four to six inches. Slope deformation analyses estimate a movement at the crest of the dam of not more than two inches horizontally and considerably less vertically, which would not result in a significant decrease in strength of the compacted soils. Reservoir induced seismicity is not considered to be a hazard.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
1st International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 1981 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
Williamson, J. V. and Shaffer, M. E., "Seismic Analysis of Spinney Mountain Dam" (1981). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 3.
https://scholarsmine.mst.edu/icrageesd/01icrageesd/session07/3
Included in
Seismic Analysis of Spinney Mountain Dam
St. Louis, Missouri
The Spinney Mountain Dam, now under construction in central Colorado, is a zoned earth embankment with a maximum height of 95 feet above foundation. Detailed geological investigations revealed rejuvenated sediments of nearby older faults, which have undergone tectonic movement within the past 13,000 to 30,000 years and hence are considered capable. Studies indicate the largest earthquake expected on the controlling fault would have a Richter Magnitude of about 6.2, implying peak ground accelerations at the site of about 0.6g and a 15-second duration of strong motion. Displacement on a branch of the main capable fault during such an event is estimated at four to six inches. Slope deformation analyses estimate a movement at the crest of the dam of not more than two inches horizontally and considerably less vertically, which would not result in a significant decrease in strength of the compacted soils. Reservoir induced seismicity is not considered to be a hazard.
