波浪对黄河水下三角洲浅表沉积物非均匀改造过程监测与机制研究

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Abstract The superficial saturated silty soil of the Yellow River submerged delta represents space heterogeneity，which leads to some geological disasters happening. To reveal the formation mechanism of heterogeneity，flume experiment is used to simulate the process of waves to the silty soil seabed. The soil strength，pore pressure and particle size changes are real-time monitored. Monitoring results show that the soil nonuniform changes are directly related to the strong wave later reconstructions. After the liquefaction of surface soil under the action of waves，fine particle material upward migration causes sediment vertical nonuniform of sediment. In a certain depth，also strength and particle size nonuniform body appears at the same time. For further analysis of the causes of formation，wave cyclic loading is in-situ simulated in the tidal flat of delta and the electrical resistivity testing technology is used for monitoring the state changes of soils. The research shows that in a certain depth，for fine grains of material，lateral migration occurs under the cyclic load，which causes uneven distribution of material. Vertical and lateral migrations contribute together to the nonuniform transformation of superficial sediments. Sharp increase of excess pore water pressure caused by wave is the major impetus of material migration；and the lateral displacement of soil grain induced by wave shearing action promotes the migration. In the process of wave action，it is also found that there is a stable layer under the violent area of silty soil all along.

Key words： soil mechanics water wave silty soil layer nonuniform transformation electrical resistivity method

Received: 31 October 2011

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http://www.rockmech.org/EN/Y2012/V31/I4/799

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