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Interpretation of CPT Data for Design of Earth Dams Near Tehachapi, California

by William A. Ward, USDA, Davis, CA, USA,



Document Type: Proceeding Paper

Part of: Use of In Situ Tests in Geotechnical Engineering

Abstract:

The Static Cone Penetration Test (CPT) was used to obtain needed geotechnical information for design and construction of two small earth dams near Tehachapi, California. The basic CPT data provided an excellent picture of the general soil profiles including location of limited weak silty sand zones in the upper 8 to 14 ft (2. 4 to 4. 3 m) at both sites. Equivalent SPT data interpreted from the CPT data were felt to be the best quantitative measure of cyclic strength for the silty sand zones. This information used in a simplified procedure for liquefaction analysis indicated potential for liquefaction in the upper silty sands considering the magnitude of the expected earthquake.

Subject Headings: Penetration tests | Soil strength | Soil liquefaction | Soil analysis | Soil properties | Data analysis | Cyclic tests | California | United States

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