engleski

Laboratory testing and numerical modelling of MBT waste deformability

The paper deals with the experimental investigation and numerical simulation of the mechanical behaviour of samples from a “Mechanical Biological Treatment” waste deposit (MBT waste deposit). Laboratory tests with samples of different moisture contents were conducted to determine the basic geotechnical characteristics as well as the stress-strain relations under loading and reloading conditions. When it is required to evaluate the load-deformation characteristics of specimens containing relatively large-diameter grain particles, like MBT waste for example, the standard oedometric apparatus with cell (sample) diameter of 56 mm is evidently inadequate. Therefore, at the University of Zagreb, an oedometer of 500 mm in internal diameter was designed, fabricated, assembled and evaluated. As only limited experimental results were available, for numerical simulations a simplified hypoplastic model was used. For the calibration of this model it was sufficient to conduct oedometer tests and to use a simple procedure to estimate the angle of friction. The model proved to be satisfactory for modelling the compaction behaviour of MBT waste observed in experiments.

compressibility ; hypoplasticity ; MBT waste ; oedometer ; stiffness

Članak prikazuje presjek zananstveno-istraživačkog rada ostvarenog u sklopu projekta "Karakterizacija krutog komunalnog otpada", voditelja prof.dr.sc. Davorina Kovačića.