Robust assessment of shear parameters from direct shear tests
by Wolfgang Fellin; Michael Oberguggenberger
International Journal of Reliability and Safety (IJRS), Vol. 6, No. 1/2/3, 2012

Abstract: In the geotechnical determination of the cohesion c and the angle of internal friction ? of a soil from shear tests, a linear regression model is fitted to normal and shear stress data, and confidence bounds are computed. The applicability of standard linear regression is limited by the physical requirement of non-negative cohesion and the statistical requirement of normality. We propose two methods from computational statistics that are able to overcome both obstacles: a bootstrap resampling method in case the experimental data set is sufficiently large, and a Bayesian approach for small samples. The methods are demonstrated at the hand of a real data set for glacial silt.

Online publication date: Sat, 27-Dec-2014

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