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Underwater explosive ram is adopted to treat the foundation inthe project of petrochemical dock in Lanshan harbor. Feasibility of this kind of foundation reinforcement method in the project of petrochemical dock in Lanshan harbor is discussed based on the analysis and comparison of the difference of sea-bottom elevation, physical and mechanical properties of sediments before and after explosive ram tests. The rational parameters of explosive ram are designed according to the result of the test. The quantitative data of underwater explosive ram are offered for large scale strengthening foundation of petrochemical dock in Lanshan harbor.