Test study on permeability of hydraulic fill under impact loading

Abstract:

The authors modified a falling head permeameter in order to explore the hydraulic conductivity of hydraulic fill under impact loading. A number of laboratory tests were conducted to investigate the effect of impact loading on permeability coefficient of hydraulic fill with different fine content, impact energy, impact passes and the interval time after hitting. It was found that the effect of fine content on permeability of hydraulic fill after impacting exists a “critical value” which was between 20% and 30%. Based on the test results, an approximate formula was developed to predict the coefficient of permeability of hydraulic fill with different fine content after hitting.

Key words:impact loading; hydraulic fill; permeability; fine content; falling head test