The vertical scale of fluctuation of soils properties and parameters has been frequently characterized by means of cone penetration testing (CPTu), as the test provides nearly continuous and repeatable data. The variability described by CPTu is not the inherent variability of a soil parameter, but the effect of the soil’s inherent variability onto the mechanical response of the CPTu [1], as the volume of soil influencing the tip and shaft resistance and the failure mode of the soil should surely have an influence. The objective of this work -of an openly prospective nature- is to examine how the inherent spatial variability of undrained, unsensitive geomaterials is transferred into the cone tip resistance and friction sleeve resistance by means of numerical modelling. Numerical simulations of CPTu insertion are performed using GPFEM [2]. A total approach is employed, and the undrained shear strength of the soil is described as a spatially-variable random field. Numerical results show that the scale of fluctuation of the tip resistance and the friction sleeve resistance is higher than the inherent scale of fluctuation of the soil. The mean value of the undrained shear strength interpreted from the cone tip resistance using a deterministic cone factor is similar to that of the soil, and the variance of the inferred shear strength is lower than the inherent variance of the shear strength of the soil. [1] Uzielli, M., Vannucchi, G., Phoon, K.K. “Random field characterization of stress-normalised cone penetration testing parameters” Géotechnique 55(1), pp. 3-20, 2005 https://doi.org/10.1680/geot.2005.55.1.3 [2] Carbonell, J.M., Monforte, L., Ciantia, M.O., Arroyo, M., Gens, A. “Geotechnical particle finite element method for modelling of soil-structure interaction under large deformation conditions”, Journal of Rock Mechanics and Geotechnical Engineering, 14(3), pp. 967-983, https://doi.org/10.1016/j.jrmge.2021.12.006