CONTINUOUS INVERS CALCULATION OF SOIL STIFFNESS FROM THE DYNAMIC BEHAVIOR OF A DRIVING VIBRATORY ROLLER

A mechanical model is introduced for the dynamic behaviour of a vibratory roller on the soil. The movement of the drum is represented by a sequence of piecewise linear differential equations. These equations are transformed into a system of nonlinear equations for the unknown soil parameters. In this way, it is possible to numerically back calculate the soil parameters from the behaviour of the drum. The main advantages of this method compared to the known empirically found methods of an entire area compaction control are shown using measured data.