Experimental study on residual deformation behaviors of municipal solid waste

Medium-scale dynamic triaxial tests are carried out to investigate the residual deformation behaviors of simulated municipal solid waste (MSW). Based on revised Shen Zhu-jiang model, parameters for modeling residual deformation of MSW are derived. Given three typical failure criteria, the effect of stress levels on model parameters is studied, and a stress level index is fitted to model the residual deformation of MSW. As the MSW is a kind of strain-hardening material, no clear peak is shown on stress-strain curve. The MSW with the same consolidation ratio results in varied stress levels in the model if multiple failure criteria are considered. To eliminate the choice of failure criterion and make the model parameter derivation straightforward, the stress level is replaced by the consolidation stress ratio, which leads to a modified and simplified model to estimate residual deformation of MSW. The modified model is verified by using the test results and will be used conveniently regardless of different failure criteria.