In geotechnical centrifuge modelling the use of a pore fluid having viscosity greater than distilled water is a well-established method to satisfy the scaling laws required to model by a single prototype both diffusion and dynamic phenomena. However, the use of a pore fluid different from distilled water might influence the physical and hydro-mechanical properties of this soil. To analyse these possible effects, the paper presents results of a quite comprehensive experimental study carried out on Pontida sandy clayey silt compacted using two different pore fluids, namely hydroxypropyl methylcellulose (HPMC) and distilled water, recently used for centrifuge modelling in Seriate (Italy). Comparing the optimum Proctor standard of both mixtures, it was found that for the soil tested the use of HPMC has little effect on strength and small strain behaviour but affects the Atterberg limits, the Proctor compaction curve, the soil compressibility, the soil-liquid retention curve and the hydraulic behaviour both in the saturated and in the unsaturated soil range. Beside discussing the above, the aim of the paper is also to present a possible laboratory testing strategy to detect the soil properties relevant to numerical simulation of the observed behaviour of model soil structures used in geotechnical centrifuge testing.
来源平台：ITALIAN GEOTECHNICAL JOURNAL-RIVISTA ITALIANA DI GEOTECNICA
