Ground Improvement Evaluation by In-Situ Tests

by James K. Mitchell, Univ of California, Berkeley, CA, USA,

Document Type: Proceeding Paper

Part of: Use of In Situ Tests in Geotechnical Engineering


The application of in-situ testing to the design and evaluation of a large sand densification project for the Jebba Hydroelectric Development is described. Correlation between the standard penetration test (SPT) N-value and the cone penetration test (CPT) tip resistance was established so that the CPT could be used for the major portion of the project after the feasibility study and liquefaction analysis were done using the SPT. Correlations between CPT tip resistance, relative density and depth were used successfully to assure that the required ground improvement had been achieved. Attempts to define the bedrock profile beneath thick alluvial sand deposits at this site by seismic refraction yielded poor results.

Subject Headings: Penetration tests | Field tests | Soil stabilization | Compacted soils | Soil properties | Sandy soils | Correlation | Load and resistance factor design

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