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What is the thickness of sediment layer required by the highway construction code of underwater cast-in-place pile friction pile?

Meet the design requirements. Unless otherwise specified, the settlement thickness of piles with diameter ≤ 1.5m ≤ 200mm; For piles with diameter > > 1.5m, or pile length > 40m, or poor soil quality, the settlement thickness shall be ≤300mm.

See JTG Technical Specification for Construction of Highway Bridges and Culverts T F50-20 1 1, table 8.7.3 on page 75.