This study experimentally investigates the variation patterns of mobile jet excavation on soft cohesive bed with a dual-nozzle jet structure.Low shear strength clay specimens of loess,kaolin,and cement are prepared,elucidating the influence of nozzle jet velocity and nozzle translation velocity on scour pit dimensions.The morphological changes of craters are analyzed based on boundary layer shear stress,and a dimensionless erosion characteristic value Z,reflecting erosion intensity under low jet-target distances,is introduced for regression analysis.Results indicate that craters formed by vertically impinging dual jets exhibit a centrally symmetrical cross-sectional profile,and the longitudinal profile of craters formed by mobile jets demonstrates geometric similarity.The scour pit dimensions show an approximate linear increase with jet velocity and a decreasing trend with increasing nozzle translation velocity.The increase in shear strength enhances the clay's resistance to erosion,leading to a gradual transition of the stable crater cross-sectional curve from V-shaped to U-shaped.
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