Biot's "u − p" approximation Environmental aspects Fujian sand Hardin model Marine engineering Technology: general issues aerodynamics binary packing model centrifugal experiment clay consolidation theory constitutive relationship continental margin continental slope coral sand coral sands cyclic loads dispersion double-frequency microseisms double-layer foundation drainage boundary dredging and reclamation dynamic response field application footprint gas distribution heavy metal immersed tunnel interior of sediment jack-up