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This paper describes research done on a new testing device including its laboratory test procedure, namely a laboratory punching test for cementitious backfill materials to evaluate their excavatability with a pick. 3D and 2D numerical studies in using a finite element method were carried out according to calibrated parameters of the material obtained by triaxial tests. This made it possible to study the behavior of the backfill material under action induced by a tool (a pick) as well as to optimize the geometry of the punching test specimen. This paper provides detailed information and results for the experimental study of this laboratory test. Attention was particularly focused on energy relating to displacement as well as types of ruptures. The behavior of these types of material was found to be greatly influenced by gravel in the material. Repeatability of the test was also studied. Finally, a method for this punching test of backfill materials is also provided

Development of an excavatability test for backfill materials: numerical and experimental studies