<p>The analysis of suction-assisted penetration resistance necessitates consideration of inherent variability in sand properties within suction foundations must be considered during the analysis of suction-assisted penetration resistance. This paper derives the critical particle size for particle initiation on the soil surface based on the upward seepage effect on soil particles. An exponential decay function is introduced to explain the erosion mechanism of soil particles during transport and blockage. The study analyzes penetration depth during suction and establishes a database of 66 measured data points on sand erosion, enabling optimization analysis of the particle activation distribution coefficient <i>A</i> in the exponential decay function. The research yields a highly accurate and moderately dispersed soil particle transport mathematical model. This model enables precise calculation of soil particle erosion during suction-assisted penetration processes in suction foundations, facilitating inference of changes in internal porosity and permeability coefficient. The enhanced understanding significantly improves suction foundation penetration design, particularly regarding permeability impacts on both sides of the foundation.</p>