Overconsolidation Characteristic And Causes Study Of Modern Yellow River Delta Sediments

80% of silts abundantly contained in Yellow River water rapidly deposit at Yellow River estuary, the consolidation process, the overconsolidation characteristic and causes of such sediments have been not clear at present. In the former researches, scholars mainly studied following independent aspects: topography and geomorphy, ocean hydrodynamic condition and soil engineering features.In order to reveal the overconsolidation characteristic and formation mechanism of modern Yellow River Delta sediment. In this paper a series of experiments were conducted on the tide flat of Diaokou delta-lobe which lies in the north of Yellow River delta. The fluid sediments imitating the rapidly deposited seabed silts were made in situ, and the fluid sediments were promptly filled into a one-meter deep pit excavated at the tide flat. By field testing methods, such as static cone penetration test(CPT), field vane shear test(FVT) and pore water piezometer test, the variation of strength and pore water pressure was measured at real time. And the strength changes of such silts and undisturbed soils of Yellow River estuary has been observed for a long time (about 16 months).For the sake of further disclosing quasi-overconsolidation state, structure strength and the relationships between structure strength and soil chemical composition of Yellow River Delta soils, laboratory testing that studied consolidation process were carried out based on aforementioned in situ test, the purpose of such experiments is that the rational explanation of the formation mechanism of quasi-overconsolidation state can be obtained.In this paper, based on Biot's poro-elastic consolidation theory, the analytical solution had proposed for the wave-induced Yellow River Delta sea-bed soils response, liquefaction depth, shear failure depth and pore water pressure field had been calculated under the wave loading that recurs one times within 50 years, the influence of liquefaction, shear failure and pore water pressure field to the over...