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Abstract Electrodes and pore water pressure probes are laid at different depths of silty soil strata in Yellow River Delta. With them，resistivity and pore water pressure are measured when the silty soil is vibrated vertically with the effects of outside force. Based on the analysis of key factors influencing the resistivity of saturated silty soil，it is revealed that the state of silty soil varies with time along depth when the silty soil is vibrated vertically and after the vibration stopped. Furthermore，the deformation characteristics of soil are analyzed to research the failure mechanism of soil mass under wave actions. Research results show that，under the vibration loading，the electrical resistivity of soil tends to show heterogenous changes at certain depth，and hence the stratified changing regularity of soil mass is discovered. The stratified changes mainly happen in the initial stage of vibration，corresponding to the rising stage of pore water pressure. But in the whole course of loading and unloading，the electrical resistivity of soil in the depth from 40 to 50 cm does not change prominently，which indicates that the soil at certain depth does not suffer corresponding vibration displacement，but keeps relatively stable. Laboratory analyses of soil microstructures and in-situ monitoring of soil intensity also prove these findings. The stratified characteristics may cause resonance vibration of the silty soil under wave actions，and consequently form the dominant factor of slope failures in the subaqueous Yellow River Delta.
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Received: 06 July 2006
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