Systematic Transformation Error in the Depth-Average Undrained Shear Strength
Mark van der Krogt (TU Delft - Hydraulic Structures and Flood Risk)
T Schweckendiek (TU Delft - Hydraulic Structures and Flood Risk)
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Abstract
In this paper we show how to calibrate a site-specific transformation model to measure the undrained shear strength from CPTs. This practically unbiased transformation model can then be used to make a better estimation of the spatial average parameter, such as the depth-average of a soil layer in a homogenous deposit, using less costly indirect measurements. We show that there is a considerable difference in terms of characteristic value and probability density, between the assumptions of entirely random or systematic transformation uncertainty. Ultimately we show what the effect is of making more realistic choices for the random and systematic part in the transformation uncertainty for a case study with actual data.