Experimental study on the effect of silt content on freezing strength of aeolian sand-cement interface
The freezing strength of the interface between soil and structure is the main parameter for the design of frost resistance of foundation in cold regions.For the study of wind-blown sand-ce-ment powder content on the influence of interface strength of frozen,with different powder con-tent,normal stress and initial moisture content of soil under the condition of interface in a series of direct shear test,and introduce the soil parameters,volume of ice content to indirectly measure the interface cementation strength,the size of the ice with Mohr coulomb strength theory,define the interface strength parameters,To study the changes of peak shear strength,interfacial ice cemen-tation force and interfacial strength parameters under different silt content.The results show that the interface stress-strain curves harden obviously with the increase of particle content.There is a positive linear correlation between freezing strength and silt content,and the initial moisture con-tent of soil does not affect the enhancement effect of silt on freezing strength.At the same initial water content,with the increase of powder content,the interface ice cementation force decreases,the interface friction Angle increases,and the interface cohesion force changes little.Through the analysis and discussion of the test results,it is concluded that the enhancement effect of silt content on freezing strength is mainly caused by the increase of friction between aeolian sand and interface.
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