Mechanical Properties and Mechanism Analysis of Kaolin Improved by 2-Line-Ferrihydrite
In order to study the influence of 2-line-ferrihydrite on the mechanical properties of kaolin,the consolidated undrained(CU)triaxial shear test,the unconsolidated undrained(UU)triaxial shear test and the scanning electron microscope test were carried out on the samples with different 2-line-ferrihydrit content to analyze the difference of shear strength index and the mechanism affecting the me-chanical properties.The shear strength index of kaolin improved by 2-line-ferrihydrite has been improved,and effect is the most signifi-cant when the content of 2-line-ferrihydrite is 7%;The increase of cohesion under the condition of CU test has a greater effect on the shear strength of improved kaolin.Under the condition of UU test,both cohesion and internal friction angle have an enhanced effect,which together determine the shear strength of kaolin;Under different consolidation conditions and different shear rates,the 2-line-fer-rihydrite adsorbed and wrapped on the surface of kaolin particles,and the formed agglomerates were connected and strengthened to limit the movement space of soil particles,increasing the shear strength.
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