Micro-structural effect of sheer failure in structured hydraulic fill

Through compression test,shear test and sensitivity test,the structure of hydraulic fill is studied,and the result shows that the hydraulic fill microstructure has great influence on its mechanical properties,so it is a kind of strong structured soil.The soil samples are analyzed quantitatively by micro-structure SEM pictures of shear test,and the relation of the void and structure unit body microstructure parameter with axial strain is studied.The micro-structural effect of hydraulic fill shearing failure is analyzed in brief.It is found that the shearing failure process of hydraulic fill can be divided into three stages:(a) compression of gas in void and migration of the moisture content;(b) spallation of the pellet,grain slippage and structure damage;and(c) formation of new structure.