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The influence of spatial variability of soils on spudcan penetration responses is found significant through numerical methods. However, due to the difficulty of preparing spatially variable soils, the penetration mechanism of the spudcan through random soils remains physically unclear. Therefore, this study aims to investigate the effects of the spatial variability of soils on the penetration behaviour of spudcan foundations by laboratory tests. A new method to prepare the spatially variable soils was proposed first. Then, three physical soil models with different scales of fluctuation and coefficients of variation were carefully prepared. The spudcan penetration was conducted in these three soil models and the penetration mechanism of the spudcan was investigated. The penetration resistances of the three cases were obtained and compared with that predicted by the methods suggested by ISO and SNAME standards. The results show that the predicted error of the penetration resistance can reach 50% when the soils have a large coefficient of variation and a small horizontal scale of fluctuation. The large difference is the significant spatial variability that has been ignored in the standards. This study paves the way to an accurate prediction of the spudcan penetration analysis in strong variable soil seabed.

Experimental modelling of spudcan penetration in spatially variable soils