Interval Fields for Geotechnical Engineering Uncertainty Analysis under Limited Data: Fid-Bau Portal

Interval Fields for Geotechnical Engineering Uncertainty Analysis under Limited Data

Feng, Chengxin / Broggi, Matteo / Hu, Yue / Faes, Matthias G. R. / Beer, Michael

Spatial uncertainty is a critical challenge in many engineering fields. To date, probabilistic methods have been applied to describe the uncertainty of engineering parameters with considerable achievements. However, they rely heavily on the availability of large quantities of informative data, but in practice, acquiring enough informative data is impossible. This paper proposes an interval field-based framework to analyze the influence of parameter uncertainty on their safety performance under sparse test data, in which the locations of test values are taken into account. It also considers uncertainties in stratigraphy and spatial properties in the geotechnical engineering case, allowing the research framework to utilize more available test information compared with previous studies. First, the interval field samples based on B-spline basis functions are generated, allowing for flexibility in accounting for realistic situations and integrating measured data from in situ exploration. Then, the finite-element strength-reduction method is used to estimate the safety factor ( $f_{s}$ ) of geotechnical engineering. Subsequently, a Bayesian global optimization is used to efficiently evaluate the upper and lower bounds of the $f_{s}$ interval. Finally, three geotechnical engineering cases are presented to illustrate the validity of the proposed framework. This framework provides new insights into engineering uncertainty analysis even with sparse data, highlighting its potential for practical applications in geotechnical engineering projects.