ABSTRACT
The slope stability of a loose sandy deposit in a lignite mining area in Germany is investigated. Increasing the slope stability, the slope has been flattened and compacted by blasting. In situ tests have been executed to find out if different compaction methods including blasting have been successful. Selected data from in situ and laboratory tests serve as input for the stability calculation. Liquefaction is not treated as limit equilibrium problem but as a stability one. The stability criterium is the excess kinetic energy after Hill. Input parameters for the hypoplastic constitutive equation are determined with simple (index) laboratory tests. These soil parameters are verified through the recalculation of triaxial undrained tests. A representative cross section of the slope including the ’’hidden dam”, which is a certain soil volume compacted by blasting, has been chosen to perform the calculations. Varying the input parameters, the influence of different soil and geometric parameters is shown.
