Evaluation of the damping ratio of soils in a resonant column using different methods

This paper addresses the differences between two approaches of damping estimation in resonant column testing: Steady-State Vibration (SSV) and Free Decay (FVD) method, at small (<0.005%) to medium (0.07%) strain range. The tests were conducted on “two types reconstituted sands” clayey soils” different relative densities confining pressures. test results suggested use SSV method measurement FVD (two or three successive cycles) measurement. A systematic decrease with increasing number cycles was observed up a certain level method. Furthermore, effects density, pressures, soil ratio derived from methods for chosen soils studied. showed that exhibits little higher value than those sandy soils.