| Summary: | Currently, <i>p-y</i> models have been broadly adopted for estimating the lateral bearing capacity of large-diameter monopiles in offshore engineering. However, the existing <i>p-y</i> curves cannot reflect the effect of pile diameter <i>D</i> on the lateral response of monopiles under local scouring conditions. In order to extend the existing <i>p-y</i> model to a large-diameter pile, a well-calibrated three-dimensional pile-soil model performed by ABAQUS is used to study the effect of the pile diameter <i>D</i> on the ultimate soil resistance <i>P</i> and the initial stiffness <i>k</i> of the Lin’s <i>p-y</i> model. Based on the numerical simulation results, two diameter-related parameters <i>A</i> and <i>B</i>, which represent the relationships between the ultimate soil resistance and the initial stiffness obtained by the numerical model and the Lin’s <i>p-y</i> model, respectively, are proposed and introduced into the Lin’s <i>p-y</i> model to present a modified <i>p-y</i> model. The comparison results show that the proposed modified <i>p-y</i> model is capable of providing a better estimation of the lateral response of large-diameter monopiles than the existing <i>p-y</i> model under a scouring condition.
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