Calibration of soil dilatancy parameters using CPT data – the case of Lucerne in central Switzerland
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Date
2022Type
- Conference Paper
ETH Bibliography
yes
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Abstract
While assessing seismic hazard for strong ground motion, non-linear soil behaviour has to be considered. However, the realistic modelling of the non-linear wave propagation requires defining complex soil models and calibration of several parameters including the soil dilatancy parameters if the effects of pore pressure excess development are taken into account. Typically, they are calibrated using triaxial experiment or trial and error method. In this study, we test the procedure by Roten (2014), in which the dilatancy parameters are calibrated using CPT data with the Neighbourhood inversion algorithm. We use the data from the city of Lucerne in Switzerland located on a very soft sedimentary basin prone to strong site effects and liquefaction. Based on synthetic tests, we conclude that the initial set of dilatancy parameters can be recovered using the presented procedure, however, in some cases, the problem is non-unique. The experiments on real data also allow obtaining realistic results but it is important to define a reasonable search range for each dilatancy parameter and calibrate the inversion algorithm to explore extensively the model space. We will investigate the influence of the obtained dilatancy parameters on the ground-motion modeling. Show more
Publication status
publishedBook title
Proceedings of the Third European Conference on Earthquake Engineering and Seismology – 3ECEESPages / Article No.
Publisher
Editura ConspressEvent
Subject
Site effects; Nonlinear soil behaviour; Cyclic mobility; Inverse problemOrganisational unit
02818 - Schweiz. Erdbebendienst (SED) / Swiss Seismological Service (SED)
Funding
813137 - New challenges for Urban Engineering Seismology (EC)
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ETH Bibliography
yes
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