Experimental study on creep behavior of red clay of existing foundation in Guiyang City

In order to further understanding the creep characteristics of red clay in the existing foundation, a uniaxial creep consolidation and triaxial creep tests were carried out in the laboratory respectively, with samples collected from the Guizhou Aluminum Plant, Guiyang City. Then a uniaxial creep empirical equation and Singh-Mitchell model were established based on the test data. The results show that under unidirectional consolidation there is a linear relationship between t/s and t, with a very high correlation coefficient. Because of the high correlation, the parameter b of the uniaxial creep equation can be used to assess total settlement in an uniaxial consolidation condition. The Singh-Mitchell three-parameter creep model established can better express the stress-strain and time relation of tested soil in the range of 25% to 100% deviatoric stress. At the same time, the SEM images show that with the increase of vertical pressure, the pore area and the number of micro particles of the red clay decrease, while the particle area gets larger, and the three-dimensional porosity grows in the uniaxial consolidation test, indicating that the change of the clay particle pores on a micro scale can be used to explain the macro phenomenon.