Investigating influence factors and developing regression model for sandy silt strength in Inner Mongolia section of Yellow River under freeze-thaw cycles
To investigate the relationship between the strength characteristics of soil at the bank slope of the Inner Mongolia section of the Yellow River and its dry density,water content and freeze-thaw cycles,based on the triaxial shear test,the effects of initial dry density,initial water content,freeze-thaw cycle and their interaction on soil shear strength parameters of sandy silt in Inner Mongolia section of the Yellow River are studied,the order and significance of influencing factors are analyzed,and the regression model for prediction of shear strength parameters of sandy silt in Inner Mongolia section of the Yellow River is constructed.The results reveal that the cohesion,internal friction angle and shear strength of sandy silt are proportional to the initial dry density,and inversely proportional to the initial water content.The cohesion and shear strength are greatly affected by freeze-thaw cycles.After 10 freeze-thaw cycles,the cohesion of the soil decreases by 22.53%-58.85%,and the shear strength decreases by 22.67%-58.91%.The internal friction angle is less affected by freeze-thaw cycles and tends to be stable as a whole.The order of factors influencing the cohesion,internal friction angle and shear strength of sandy silt is initial dry density＞initial water content＞freeze-thaw cycles.The cohesion and shear strength of soil are not only significantly affected by the single factor of initial dry density,initial water content and freeze-thaw cycles,but also significantly affected by the interaction of initial dry density and initial water content,initial dry density and freeze-thaw cycles.The internal friction angle of the soil is only significantly affected by the initial dry density and initial water content of the soil and their interaction.The regression model for soil shear strength parameters,established based on initial dry density,initial moisture content,and the number of freeze-thaw cycles,demonstrates a high degree of fit,which can be used to estimate the strength of the bank-slope sandy silt in the Inner Mongolia section of the Yellow River,The research results can provide technical guidance for the regulation engineering practice of riverbank embankment.
freeze-thaw effectshear strengthorthogonal testregression modelInner Mongolia section of Yellow River
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