Research Of Cyclic Loading And Bioturbation's Influence On Seabed Sediment Permeability In Yellow River Estuary

Cyclic loading and bioturbation's influence on seabed sediment permeability in Yellow River estuary is studied. The approaches adopted as follows. (1) The research of seabed sediment permeability's change induced by cyclic loading is done in the Diaokou area of Yellow River estuary. And undisturbed soil samples are taken for laboratory testing, such as permeability testing. (2) Macrophthalmus japonicus beds and nearby areas without bioturbation are selected to study the influence of bioturbation on seabed sediment permeability through permeability testing. Undisturbed soil samples are taken for laboratory permeability testing, etc. (3) The high-density resistivity method is used to test the resistivity of sediment both Macrophthalmus japonicus bed and nearby area without bioturbation.The basis of Yellow River estuary sediment is silt. The relationship between silt's coefficient of permeability and vibration energy of cyclic loading can be expressed with cubic polynomial. The expelling of granule substance under the cyclic loading accelerates accretion of coefficient of permeability. The change of density and particle size distribution of soils results in the change of coefficient of permeability.The Yellow River estuary is commonly dominated by benthic species, especially crabs, which are important factors in changing the sedimentary conditions. The burrowing of Macrophthalmus japonicus and up transfers of granule substance induced by its activity accelerates the coefficient of permeability in the Macrophthalmus japonicus beds. The conclusion is approved through high-density resistivity method.In the research area, cyclic loading has a stronger effect on seabed sediment permeability than Macrophthalmus japonicus'activity.