Accession Number : ADA186797

Title :   Statistical Analysis of Geotechnical Data.

Descriptive Note : Final rept.,

Corporate Author : NEXUS ASSOCIATES WAYLAND MA

Personal Author(s) : Baecher, Gregory

PDF Url : ADA186797

Report Date : Sep 1987

Pagination or Media Count : 154

Abstract : This report provides a tutorial introduction to practical techniques of statistical data analysis for geotechnical engineering--the intended audience is the practicing geotechnical engineer with little or no background in statistics. The approach summarizes soil parameters by two numbers: a best estimate and a measure of uncertainty. Uncertainties in soil parameter estimates of four types are considered--(a) variability in the soil deposit; (b) random measurement error; (c) measurement bias; and (d) limited numbers of tests. The first two cause data scatter. The second two cause systematic error. A procedure is developed to assess each source individually and then to combine them into a statistical soil profile. The statistical profile shows the best estimate of soil properties with depth and uncertainty envelopes about that profile. The statistical design profile is the first step in error analysis, as described in the accompanying report. AD-A186795. Keywords: Embankment dams; Risk assessment.

Descriptors :   *STATISTICAL ANALYSIS, *ENGINEERING GEOLOGY, BIAS, DAMS, DEPOSITS, EMBANKMENTS, ERROR ANALYSIS, ERRORS, ESTIMATES, MEASUREMENT, PROFILES, RISK, SCATTERING, SOILS, STATISTICAL DATA, STATISTICS, SOIL MECHANICS, DATA REDUCTION, HISTOGRAMS, CORRELATION TECHNIQUES, REGRESSION ANALYSIS

Subject Categories : Civil Engineering
      Statistics and Probability

Distribution Statement : APPROVED FOR PUBLIC RELEASE