Blasting mud displacement technology has always played a crucial role in reclamation projects. To further analyze the effectiveness and application of blasting dike construction technology in complex thick silt soft soil layers, this study first utilized the excellent linear classification and prediction capabilities of Support Vector Machines (SVM) to construct a prediction model for dike slope displacement. Additionally, the traditional blasting mud displacement process was optimized by proposing a full lateral blasting mud displacement technique aimed at achieving mud-rock displacement in thick silt soft soil layers. The full lateral blasting mud displacement technique eliminates the need for end blasting, instead using lateral fixed-point and dike widening blasting methods to accomplish the mud displacement task. In the experimental results analysis section, the performance of SVM prediction models with different kernel functions was tested. The results indicated that the SVM model with the RBF kernel had the best prediction performance, with mean squared error values for different measurement points not exceeding 0.35. By adjusting the blasting parameters at different blasting sites and comparing the settlement values at four blasting sites using the full lateral blasting mud displacement technique, it was found that the construction plan is feasible, with all settlement values remaining within reasonable ranges. This study provides a new approach for mud-rock displacement in thick silt layers using blasting mud displacement technology in dike construction.